National Bank (NBHC) 10-K 24 Feb 21 2020 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 22, 2021	Jun. 30, 2020
Document Document And Entity Information
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2020
Entity File Number	001-35654
Entity Registrant Name	NATIONAL BANK HOLDINGS CORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-0563799
Entity Address, Address Line One	7800 East Orchard Road, Suite 300
Entity Address, City or Town	Greenwood Village
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80111
City Area Code	303
Local Phone Number	892-8715
Title of 12(b) Security	Class A Common Stock, Par Value $0.01
Trading Symbol	NBHC
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		30,642,692
Entity Public Float			$ 796,000,000
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0001475841
Amendment Flag	false

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Cash and due from banks	$ 605,065	$ 109,690
Interest bearing bank deposits	500	500
Cash and cash equivalents	605,565	110,190
Investment securities available-for-sale (at fair value)	661,955	638,249
Investment securities held-to-maturity (fair value of $381,691 and $183,741 at December 31, 2020 and December 31, 2019, respectively)	376,615	182,884
Non-marketable securities	16,493	29,751
Loans	4,353,726	4,415,406
Allowance for credit losses	(59,777)	(39,064)
Loans, net	4,293,949	4,376,342
Loans held for sale	247,813	117,444
Other real estate owned	4,730	7,300
Premises and equipment, net	106,982	112,151
Goodwill	115,027	115,027
Intangible assets, net	17,928	11,361
Other assets	212,893	194,813
Total assets	6,659,950	5,895,512
Liabilities:
Non-interest bearing demand deposits	2,111,045	1,184,945
Interest bearing demand deposits	514,286	738,496
Savings and money market	2,064,769	1,755,538
Time deposits	986,132	1,058,153
Total deposits	5,676,232	4,737,132
Securities sold under agreements to repurchase	22,897	56,935
Federal Home Loan Bank advances		207,675
Other liabilities	140,130	126,850
Total liabilities	5,839,259	5,128,592
Shareholders' equity:
Common stock, par value $0.01 per share: 400,000,000 shares authorized; 51,487,907 and 51,487,907 shares issued; 30,634,291 and 31,176,627 shares outstanding at December 31, 2020 and December 31, 2019, respectively	515	515
Additional paid-in capital	1,011,362	1,009,223
Retained earnings	223,175	164,082
Treasury stock of 20,686,986 and 20,189,082 shares at December 31, 2020 and December 31, 2019, respectively, at cost	(424,127)	(408,962)
Accumulated other comprehensive income, net of tax	9,766	2,062
Total shareholders' equity	820,691	766,920
Total liabilities and shareholders' equity	$ 6,659,950	$ 5,895,512

Consolidated Statements of Fi_2

Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Investment securities held-to-maturity, fair value	$ 381,691	$ 183,741
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized	400,000,000	400,000,000
Common Stock, shares issued	51,487,907	51,487,907
Common Stock, shares outstanding	30,634,291	31,176,627
Treasury stock, shares	20,686,986	20,189,082

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest and dividend income:
Interest and fees on loans	$ 200,026	$ 218,836	$ 193,124
Interest and dividends on investment securities	16,505	21,297	25,746
Dividends on non-marketable securities	1,157	1,770	1,096
Interest on interest-bearing bank deposits	314	698	1,425
Total interest and dividend income	218,002	242,601	221,391
Interest expense:
Interest on deposits	23,629	29,803	21,041
Interest on borrowings	1,427	6,968	2,913
Total interest expense	25,056	36,771	23,954
Net interest income before provision for loan losses	192,946	205,830	197,437
Provision for loan losses	17,630	11,643	5,197
Net interest income after provision for loan losses	175,316	194,187	192,240
Non-interest income:
Mortgage banking income	102,384	42,346	30,107
Bank-owned life insurance income	2,360	1,713	1,791
Other non-interest income	4,719	5,888	5,379
OREO-related income	387	315	917
Total non-interest income	140,258	82,752	70,775
Non-interest expense:
Salaries and benefits	141,170	122,732	114,939
Occupancy and equipment	27,473	27,336	28,493
Telecommunications and data processing	9,042	8,754	10,098
Marketing and business development	2,802	3,897	4,513
FDIC deposit insurance	1,168	1,049	2,475
Bank card expenses	4,388	4,780	5,453
Professional fees	2,946	3,256	6,059
Other non-interest expense	10,547	10,867	13,073
Problem asset workout	3,148	3,186	2,549
Gain on OREO sales, net	(38)	(7,193)	(488)
Core deposit intangible asset amortization	1,183	1,183	2,170
Banking center consolidation-related expense	2,348	898
Total non-interest expense	206,177	180,745	189,334
Income before income taxes	109,397	96,194	73,681
Income tax expense	20,806	15,829	12,230
Net income	$ 88,591	$ 80,365	$ 61,451
Earnings per share-basic (in dollars per share)	$ 2.87	$ 2.57	$ 2
Earnings per share-diluted (in dollars per share)	$ 2.85	$ 2.55	$ 1.95
Weighted average number of common shares outstanding:
Basic (Shares)	30,857,086	31,175,825	30,748,234
Diluted (Shares)	31,075,857	31,530,817	31,430,074
Service charges
Non-interest income:
Non-interest income	$ 14,962	$ 17,895	$ 18,092
Bank card fees
Non-interest income:
Non-interest income	$ 15,446	$ 14,595	$ 14,489

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 88,591	$ 80,365	$ 61,451
Securities available-for-sale:
Net unrealized gains (losses) arising during the period, net of tax (expense) benefit of ($2,634), ($4,510) and $876 for the years ended December 31, 2020, 2019 and 2018, respectively.	8,482	14,352	(2,243)
Less: amortization of net unrealized holding gains to income, net of tax benefit of $248, $320 and $361 for the years ended December 31, 2020, 2019 and 2018, respectively.	(778)	(1,015)	(1,311)
Other comprehensive income (loss)	7,704	13,337	(3,554)
Comprehensive income	$ 96,295	$ 93,702	$ 57,897

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Tax (expense) benefit on net unrealized gains arising during the period	$ (2,634)	$ (4,510)	$ 876
Tax (expense) benefit of amortization of net unrealized holding gains to income	$ 248	$ 320	$ 361

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Common stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained earnings [Member]	Treasury stock [Member]	Accumulated other comprehensive (loss) income, net [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Total
Balance in the beginning at Dec. 31, 2017	$ 515	$ 970,668		$ 60,795	$ (493,329)	$ (6,242)		$ 532,407
Increase (Decrease) in Stockholders' Equity
Net income				61,451				61,451
Stock-based compensation		4,420						4,420
Issuance of stock under purchase and equity compensation plans, including gain on reissuance of treasury stock, net		(2,932)			9,736			6,804
Reissuance of treasury stock of 3,398,477 shares for acquisition of Peoples, Inc.		42,243			67,970			110,213
Cash dividends declared				(16,761)				(16,761)
Reclassification of certain tax effects from accumulated other comprehensive income				1,479		(1,479)
Other comprehensive income (loss)						(3,554)		(3,554)
Balance in the ending at Dec. 31, 2018	515	1,014,399	$ 26	106,990	(415,623)	(11,275)	$ 26	695,006
Increase (Decrease) in Stockholders' Equity
Net income				80,365				80,365
Stock-based compensation		4,869						4,869
Issuance of stock under purchase and equity compensation plans, including gain on reissuance of treasury stock, net		(10,045)			6,661			(3,384)
Cash dividends declared				(23,529)				(23,529)
Other comprehensive income (loss)						13,337		13,337
Balance in the ending at Dec. 31, 2019	515	1,009,223	(256)	164,082	(408,962)	2,062	(256)	766,920
Increase (Decrease) in Stockholders' Equity
Net income				88,591				88,591
Stock-based compensation		5,299						5,299
Issuance of stock under purchase and equity compensation plans, including gain on reissuance of treasury stock, net		(3,160)			4,311			1,151
Repurchase of 734,117 shares					(19,476)			(19,476)
Cash dividends declared				(24,875)				(24,875)
Other comprehensive income (loss)						7,704		7,704
Balance in the ending at Dec. 31, 2020	$ 515	$ 1,011,362	$ 4,623	$ 223,175	$ (424,127)	$ 9,766	$ 4,623	$ 820,691

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Gain on reissuance of treasury stock	$ 1,588	$ 6,010	$ 7,998
Reissuance of treasury stock, shares			3,398,477
Shares repurchased (shares)	734,117
Cash dividends declared per share	$ 0.80	$ 0.75	$ 0.54

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 88,591	$ 80,365	$ 61,451
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provision for loan losses	17,630	11,643	5,197
Provision (release) for mortgage loan repurchases	662	(366)	370
Depreciation and amortization	14,449	15,038	11,522
Change in current income tax receivable	(2,371)	1,955	4,246
Change in deferred income taxes	3,477	8,793	9,092
Net excess tax expense (benefit) on stock-based compensation	51	(2,160)	(1,286)
Discount accretion, net of premium amortization on securities	3,374	2,047	2,911
Loan accretion	(11,694)	(15,590)	(23,115)
Gain on sale of mortgages, net	(98,250)	(39,922)	(27,009)
Origination of loans held for sale, net of repayments	(2,376,660)	(1,317,547)	(1,005,850)
Proceeds from sales of loans held for sale	2,348,166	1,289,877	1,030,906
Bank-owned life insurance income	(2,360)	(1,713)	(1,791)
Gain on the sale of other real estate owned, net	(38)	(7,193)	(488)
Originations of mortgage serving rights	(10,354)	(27)	(30)
Impairment of mortgage servicing rights	751	129	21
Impairment on other real estate owned	470	1,082	230
Impairment on fixed assets related to banking center consolidations	1,631	898
Stock-based compensation	5,299	4,869	4,420
Operating lease payments	(5,414)	(5,294)
Acquisition-related costs			(7,957)
Change in other assets	(21,323)	(799)	(3,645)
Change in other liabilities	34,045	16,391	14,379
Net cash (used in) provided by operating activities	(9,868)	42,476	73,574
Cash flows from investing activities:
Purchase of FHLB stock	(451)	(16,761)	(16,463)
Proceeds from redemption of FHLB stock	13,709	14,565	12,062
Purchase of FRB stock			(4,716)
Proceeds from redemption of FRB stock			1,371
Proceeds from maturities of investment securities held-to-maturity	88,071	60,948	61,913
Proceeds from maturities of investment securities available-for-sale	271,508	195,467	216,077
Proceeds from sales of investment securities available-for-sale	0	20,378	33,637
Proceeds from maturities of non-marketable securities			67
Purchase of investment securities held-to-maturity	(284,170)	(10,201)	(40,735)
Purchase of investment securities available-for-sale	(286,130)	(45,745)	(72,555)
Net decrease (increase) in loans	49,209	(312,844)	(382,441)
Purchases of premises and equipment, net	(4,352)	(11,204)	(6,277)
Purchase of bank-owned life insurance		(20,000)
Proceeds from sales of loans			713
Proceeds from sales of other real estate owned	3,671	12,112	26,346
Net cash activity from acquisition			68,984
Net cash used in investing activities	(148,935)	(113,285)	(102,017)
Cash flows from financing activities:
Net increase (decrease) in deposits	939,100	201,511	(173,849)
Net decrease in repurchase agreements and other short-term borrowings	(34,038)	(9,112)	(64,416)
Advances from FHLB	947,431	1,477,447	889,416
FHLB repayments	(1,155,106)	(1,571,432)	(750,696)
Issuance of stock under purchase and equity compensation plans	(749)	(6,229)	(772)
Proceeds from exercise of stock options	1,832	2,788	7,576
Payment of dividends	(24,816)	(23,530)	(16,624)
Repurchase of common stock	(19,476)
Net cash provided by (used in) financing activities	654,178	71,443	(109,365)
Increase (decrease) in cash, cash equivalents and restricted cash	495,375	634	(137,808)
Cash, cash equivalents and restricted cash at beginning of the year	120,190	119,556	257,364
Cash, cash equivalents and restricted cash at end of period	615,565	120,190	119,556
Supplemental disclosure of cash flow information during the period:
Cash paid for interest	27,622	34,458	22,714
Net tax payment	22,111	9,271	(2,345)
Supplemental schedule of non-cash activities:
Loans transferred to other real estate owned at fair value	1,533	2,705	24,940
(Decrease) increase in loans purchased but not settled	(16,351)	7,372	(21,202)
Loans transferred from loans held for sale to loans	$ 3,625	1,732	1,038
Lease right-of-use assets obtained		$ (30,474)
Treasury stock reissued for acquisition			$ 110,213

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) - Peoples Inc - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted cash placed in escrow	$ 10	$ 10	$ 10
Restricted Cash, Asset, Statement of Financial Position [Extensible List]	Other Assets	Other Assets	Other Assets

Basis of Presentation

Basis of Presentation	12 Months Ended
	Dec. 31, 2020
Basis of Presentation
Basis of Presentation	Note 1 Basis of Presenta tion ​ National Bank Holdings Corporation is a bank holding company that was incorporated in the State of Delaware in 2009. The Company is headquartered in Denver, Colorado, and its primary operations are conducted through its wholly owned subsidiary, NBH Bank (the "Bank"), a Colorado state-chartered bank and a member of the Federal Reserve System. The Company provides a variety of banking products to both commercial and consumer clients through a network of 90 banking centers as of December 31, 2020, located primarily in Colorado and the greater Kansas City region, and through online and mobile banking products and services. ​ The accompanying consolidated financial statements include the accounts of the Company and its wholly owned subsidiary, NBH Bank. The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and, where applicable, with general practices in the banking industry or guidelines prescribed by bank regulatory agencies. The consolidated financial statements reflect all adjustments which are, in the opinion of management, necessary for a fair statement of the results presented. All such adjustments are of a normal recurring nature. All significant intercompany balances and transactions have been eliminated in consolidation. Certain reclassifications of prior years' amounts are made whenever necessary to conform to current period presentation. During the first quarter of 2020, the Company updated the loan classifications in its allowance for credit losses model and loans previously referred to as “310-30” were reclassified to “acquired loans.” Certain loan classifications within the consolidated financial disclosures have been updated to reflect this change. The prior period presentations have been reclassified to conform to the current period presentations. Refer to note 6 for further discussion. All amounts are in thousands, except share data and per share data, or as otherwise noted. ​ General economic conditions declined during 2020 as a result of the COVID-19 pandemic, which has caused substantial disruption to the communities we serve and has changed the way we live and work. The length of the pandemic and the efficacy of the extraordinary government-mandated measures that have been put into place to address it are still unknown, but have already had, and are likely to continue to have, a significant impact to the financial condition and operations of the Company. ​ GAAP requires management to make estimates that affect the reported amounts of assets, liabilities, revenues and expenses and disclosures of contingent assets and liabilities. By their nature, estimates are based on judgment and available information. Management has made significant estimates in certain areas, such as the amount and timing of expected cash flows from assets, the valuation of other real estate owned, the fair value adjustments on assets acquired and liabilities assumed, the valuation of core deposit intangible assets, the valuation of investment securities, the valuation of stock-based compensation, the valuation of MSRs, the fair values of financial instruments, the allowance for credit losses and contingent liabilities. Because of the inherent uncertainties associated with any estimation process and future changes in market and economic conditions, it is possible that actual results could differ significantly from those estimates.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Summary of Significant Accounting Policies
Summary of Significant Accounting Policies	Note 2 Summary of Significant Accounting Policies ​ a) Cash and cash equivalents ​ b) Investment securities ​ Management evaluates all investments in an unrealized loss position on a quarterly basis, and more frequently when economic or market conditions warrant such evaluation. If the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security, the security is written down to fair value and the entire loss is recorded in earnings. If either of the above criteria is not met, we evaluate whether the decline in fair value is the result of credit losses or other factors. In making the assessment, we may consider various factors including the extent to which fair value is less than amortized cost, performance on any underlying collateral, downgrades in the ratings of the security by a rating agency, the failure of the issuer to make scheduled interest or principal payments and adverse conditions specifically related to the security. If the assessment indicates that a credit loss exists, the present value of cash flows expected to be collected are compared to the amortized cost basis of the security and any excess is recorded as an allowance for credit loss. When the loss is not considered a result of credit loss, the cost basis of the security is written down to fair value, with the loss charge recognized in AOCI. The Company does not measure expected credit losses for U.S. agency-backed held-to-maturity securities, since the risk of nonpayment of the amortized cost basis is zero. Credit losses are not estimated for AIR from investment securities as interest deemed uncollectible is written off through interest income. ​ Prior to the adoption of ASU 2016-13, declines in the fair value of held-to-maturity and available-for-sale securities below their cost that were deemed to be other-than-temporarily impaired were reflected in earnings as realized losses. In estimating other-than-temporary-impairment prior to January 1, 2020, the Company considered, among other things, the severity and duration of the unrealized loss position; adverse conditions specifically related to the security; changes in expected future cash flows; downgrades in the rating of the security by a rating agency; the failure of the issuer to make scheduled interest or principal payments; whether the Company had the intent to sell the security; and whether it was more likely than not that the Company would be required to sell the security. ​ c) Non-marketable securities ​ d) Loans receivable — ​ Estimated fair values of acquired loans are based on a discounted cash flow methodology that considers various factors including the type of loan and related collateral, the expected timing of cash flows, classification status, fixed or variable interest rate, term of loan and whether or not the loan is amortizing, and a discount rate reflecting the Company’s assessment of risk inherent in the cash flow estimates. Discounts created when the loans are recorded at their estimated fair values at acquisition are accreted over the remaining term of the loan as an adjustment to the related loan’s yield. Similar to originated loans described below, the accrual of interest income on acquired loans is discontinued when the collection of principal or interest, in whole or in part, is doubtful. ​ Interest income on acquired loans and interest income on loans originated by the Company is accrued and credited to income as it is earned using the interest method based on daily balances of the principal amount outstanding. However, interest is generally not accrued on loans 90 days or more past due, unless they are well secured and in the process of collection. Additionally, in certain situations, loans that are not contractually past due may be placed on non-accrual status due to the continued failure to adhere to contractual payment terms by the borrower coupled with other pertinent factors, such as insufficient collateral value or deficient primary and secondary sources of repayment. Accrued interest receivable is reversed when a loan is placed on non-accrual status and payments received generally reduce the carrying value of the loan. Interest is not accrued while a loan is on non-accrual status and interest income is generally recognized on a cash basis only after payment in full of the past due principal and collection of principal outstanding is reasonably assured. A loan may be placed back on accrual status if all contractual payments have been received, or sooner under certain conditions and collection of future principal and interest payments is no longer doubtful. ​ In the event of borrower default, the Company may seek recovery in compliance with state lending laws, the respective loan agreements, and credit monitoring and remediation procedures that may include modifying or restructuring a loan from its original terms, for economic or legal reasons, to provide a concession to the borrower from their original terms due to borrower financial difficulties in order to facilitate repayment. Such restructured loans are considered “troubled debt restructurings” and are identified in accordance with ASC 310-40. ​ The CARES Act afforded financial institutions the option to modify loans within certain parameters in response to the COVID-19 pandemic without requiring the modifications to be classified as TDRs if the borrower has been adversely impacted by COVID-19 and was current on their loan payments. The Company has modified loans due to the effects of the COVID-19 pandemic that were not classified as TDRs. Modifications include deferral of principal as well as full-payment deferral for a period ranging from three months to one year. The number and aggregate balance of COVID-related loan modifications substantially decreased during the third quarter, and we continue to monitor the remaining COVID loan modifications closely. ​ e) Loans held for sale — ​ The Company enters into commitments to originate residential mortgage loans whereby the interest rate on the loan is determined prior to funding (i.e. interest rate lock commitments). Such interest rate lock commitments on mortgage loans to be sold in the secondary market are considered to be derivatives. To protect against the price risk inherent in residential mortgage loan commitments, the Company utilizes both "best efforts" and "mandatory delivery" forward loan sale commitments to mitigate the risk of potential increases or decreases in the values of loans that would result from the change in market rates for such loans. The Company manages the interest rate risk on interest rate lock commitments by entering into forward sale contracts of mortgage backed securities. Such contracts are accounted for as derivatives and are recorded at fair value as derivative assets or liabilities. They are carried on the consolidated statements of financial condition within other assets or other liabilities, and changes in fair value are recorded net as a component of mortgage banking income in the consolidated statements of operations. The gross gains on loan sales are recognized based on new loan commitments with adjustment for price and pair-off activity. Commission expenses on loans held for sale are recognized based on loans closed. ​ f) Allowance for credit losses Measurement of Credit Losses on Financial Instruments ​ The ACL represents management’s estimate of lifetime credit losses inherent in loans as of the balance sheet date. The Company measures expected credit losses for loans on a pooled basis when similar risk characteristics exist. The Company has identified four primary loan segments that are further stratified into 11 loan classes to provide more granularity in analyzing loss history based upon specific loss drivers and risk factors affecting each loan class. Generally, the underlying risk of loss for each of these loan classes will follow certain norms/trends in various economic environments. Loans that do not share risk characteristics are evaluated on an individual basis and are not included in the collective evaluation. Those loans include loans on non-accrual status, loans in bankruptcy, and TDRs described below. If a specific allowance is warranted based on the borrower’s overall financial condition, the specific allowance is calculated based on discounted expected cash flows using the loan’s initial contractual effective interest rate or the fair value of the collateral less selling costs for collateral-dependent loans. ​ The Company utilizes a DCF model developed within a third-party software tool to establish expected lifetime credit losses for the loan portfolio. The ACL is calculated as the difference between the amortized cost basis and the projections from the DCF analysis. The DCF model allows for individual life of loan cash flow modeling, excluding extensions and renewals, using loan-specific interest rates and repayment schedules adjusted for estimated prepayment rates and loss recovery timing delays. The model incorporates forecasts of certain national macroeconomic factors, including unemployment rates, HPI, retail sales and GDP, which drive correlated probability of default (“PD”) and loss given default (“LGD”) rates. PD and LGD, in turn, drive the losses predicted in establishing our ACL. PD and LGD rates along with prepayment rates and loss recovery time delays are determined at a loan class level making use of both internal and peer historical loss rate data. The determination and application of the ACL accounting policy involves judgments, estimates, and uncertainties that are subject to change. For periods beyond the reasonable and supportable forecast period, we revert to historical long-term average loss rates on a straight-line basis. The length of the forecast period spans four quarters. The length of the reversion period is based on management’s assessment of the length and pattern of the current economic cycle and typically ranges from four to eight quarters. ​ Management accounts for the inherent uncertainty of the underlying economic forecast by reviewing and weighting alternate forecast scenarios. Additionally, the ACL calculation includes subjective adjustments for qualitative risk factors that are likely to cause estimated credit losses to differ from historical experience. These qualitative adjustments may increase or reduce reserve levels and include adjustments for lending management experience and risk tolerance, loan review and audit results, asset quality and portfolio trends, loan portfolio growth and industry concentrations. The Company has elected to exclude AIR from the allowance for credit losses calculation. When a loan is placed on non-accrual, any recorded AIR is reversed against interest income. ​ The determination and application of the ACL accounting policy involves judgments, estimates, and uncertainties that are subject to change. Changes in these assumptions, estimates or the conditions surrounding them may have a material impact on our financial condition, liquidity or results of operations. Various regulatory agencies, as an integral part of the examination process, periodically review the ACL. Such agencies may require the Company to recognize additions to the ACL or reserve increases to adversely graded classified loans based on their judgments about information available to them at the time of their examinations. ​ The ACL is decreased by net charge-offs and is increased by provisions for loan losses that are charged to the statements of operations. Charge-offs, if any, are typically measured for each loan based on a thorough analysis of the most probable source of repayment, such as the present value of the loan’s expected future cash flows, the loan’s estimated fair value, or the estimated fair value of the underlying collateral less costs of disposition for collateral-dependent loans. When it is determined that specific loans, or portions thereof, are uncollectible, these amounts are charged off against the ACL. ​ The Company uses an internal risk rating system to indicate credit quality in the loan portfolio. The risk rating system is applied to all loans and uses a series of grades, which reflect management’s assessment of the risk attributable to loans based on an analysis of the borrower’s financial condition and ability to meet contractual debt service requirements. Loans that management perceives to have acceptable risk are categorized as “Pass” loans. The “Special Mention” loans represent loans that have potential credit weaknesses that deserve management’s close attention. Special mention loans include borrowers that have potential weaknesses or unwarranted risks that, unless corrected, may threaten the borrower’s ability to meet debt requirements. However, these borrowers are still believed to have the ability to respond to and resolve the financial issues that threaten their financial situation. Loans classified as “Substandard” are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Substandard loans have a distinct possibility of loss if the deficiencies are not corrected. “Doubtful” loans are loans that management believes the collection of payments in accordance with the terms of the loan agreement is highly questionable and improbable. Credit quality indicators are reviewed and updated in accordance with internal policy based on loan balance and risk rating. Interest accrual is discontinued on doubtful loans and certain substandard loans, as is more fully discussed in note 4. ​ Unfunded loan commitments ​ In addition to the ACL for funded loans, the Company maintains reserves to cover the risk of loss associated with off-balance sheet unfunded loan commitments. The allowance for off-balance sheet credit losses is maintained within the other liabilities in the statements of financial condition. Under the CECL framework, adjustments to this liability are recorded as provision for credit losses in the statements of operations. Unfunded loan commitment balances are evaluated by loan class and further segregated by revolving and non-revolving commitments. In order to establish the required level of reserve, the Company applies average historical utilization rates and ACL loan model loss rates for each loan class to the outstanding unfunded commitment balances. ​ Prior to the adoption of ASU 2016-13, the Company’s determination of the allowance took into consideration, among other matters, the estimated fair value of the underlying collateral, economic conditions, historical net loan losses, the estimated loss emergence period, estimated default rates, any declines in cash flow assumptions from acquisitions, loan structures, growth factors and other elements that warrant recognition. ​ Under the prior incurred loss methodology, the Company routinely evaluated adversely risk-rated credits for impairment. Impairment, if any, was typically measured for each loan based on a thorough analysis of the most probable source of repayment, including the present value of the loan’s expected future cash flows, the loan’s estimated fair value, or the estimated fair value of the underlying collateral less costs of disposition for collateral dependent loans. General allowances were established for loans with similar characteristics. In this process, general allowance factors were based on an analysis of historical loss and recovery experience, if any, related to originated and acquired loans, as well as certain industry experience, with adjustments made for qualitative or environmental factors that were likely to cause estimated credit losses to differ from historical experience. To the extent that the data supporting such factors had limitations, management’s judgment and experience played a key role in determining the allowance estimates. ​ g) Premises and equipment 7 3 ​ h) Goodwill and intangible assets Company would proceed to perform an additional test to determine whether goodwill has been impaired and calculate the amount of that impairment. ​ Intangible assets that have finite useful lives, such as core deposit intangibles, are amortized over their estimated useful lives. The Company’s core deposit intangible assets represent the value of the anticipated future cost savings that will result from the acquired core deposit relationships versus an alternative source of funding. Judgment may be used in assessing goodwill and intangible assets for impairment. Estimates of fair value are based on projections of revenues, operating costs and cash flows of the reporting unit considering historical and anticipated future results, general economic and market conditions, as well as the impact of planned business or operational strategies. The valuations use a combination of present value techniques to measure fair value considering market factors. Additionally, judgment is used in determining the useful lives of finite-lived intangible assets. Adverse changes in the economic environment, operations of the reporting unit, or changes in judgments and projections could result in a significantly different estimate of the fair value of the reporting unit and could result in an impairment of goodwill and/or intangible assets. ​ MSRs associated with loans originated and sold, where servicing is retained, are initially capitalized at fair value and included in intangible assets on the consolidated statements of financial condition. For subsequent measurement purposes, the Company measures servicing assets based on the lower of cost or market using the amortization method. The values of these capitalized servicing rights are amortized as an offset to the loan servicing income earned in relation to the servicing revenue expected to be earned. The carrying values of these rights are reviewed quarterly for impairment based on the fair value of those assets. For purposes of impairment evaluation and measurement, management stratifies MSRs based on the predominant risk characteristics of the underlying loans, including loan type and loan term. If, by individual stratum, the carrying amount of these MSRs exceeds fair value, a valuation allowance is established and the impairment is recognized in mortgage banking income. If the fair value of impaired MSRs subsequently increases, management recognizes the increase in fair value in current period mortgage banking income and, through a reduction in the valuation allowance, adjusts the carrying value of the MSRs to a level not in excess of amortized cost. ​ i) Reserve for Mortgage Loan Repurchase Losses– ​ The Company establishes mortgage repurchase reserves related to various representations and warranties that reflect management’s estimate of losses based on a combination of factors. Such factors incorporate actual and historic loss history, delinquency trends in the portfolio and economic conditions. The Company establishes a reserve at the time loans are sold and updates the reserve estimate quarterly during the estimated loan life. The repurchase reserve is included in other liabilities on the consolidated statements of financial condition. ​ j) Other real estate owned ​ k) Bank-owned life insurance ​ l) Securities purchased under agreements to resell and securities sold under agreements to repurchase ​ m) Stock-based compensation ​ The fair value of stock options is measured using a Black-Scholes model. The fair value of time-based restricted stock awards and performance stock units with performance based vesting criteria is based on the Company’s stock price on the date of grant. The fair value of performance stock units with market-based vesting criteria is measured using a Monte Carlo simulation model. Compensation expense for the portion of the awards that contain performance and service vesting conditions is recognized over the requisite service period based on the fair value of the awards on the grant date. Compensation expense for the portion of the awards that contain a market vesting condition is recognized over the derived service period based on the fair value of the awards on the grant date. The amortization of stock-based compensation reflects any estimated forfeitures, and the expense realized in subsequent periods may be adjusted to reflect the actual forfeitures realized. The outstanding stock options primarily carry a maximum contractual term of ten years. To the extent that any award is forfeited, surrendered, terminated, expires, or lapses without being vested or exercised, the shares of stock subject to such award not delivered are again made available for awards under the Plan. ​ All excess tax benefits and tax deficiencies (including tax benefits of dividends on share-based payment awards) are recognized in the consolidated statements of operations as a component of income tax expense or benefit and are classified as an operating activity within the Company’s consolidated statements of cash flows. The tax effects of exercised, expired or vested awards are treated as discrete items in the reporting period in which they occur and may result in increased volatility in our effective tax rate. Cash paid by the Company when directly withholding shares for tax withholding purposes is classified as a financing activity in the consolidated statements of cash flows. ​ n) Income taxes ​ Deferred tax assets and liabilities are recognized for temporary differences between the financial reporting basis and the tax basis of the Company’s assets and liabilities at enacted tax rates expected to be in effect when such amounts are realized or settled. Deferred tax assets and liabilities are adjusted for the effects of changes in tax rates in the period of change. The Company establishes a valuation allowance when management believes, based on the weight of available evidence, it is more likely than not that some portion of the deferred tax assets will not be realized. ​ The Company recognizes and measures income tax benefits based upon a two-step model: 1) a tax position must be more likely than not to be sustained based solely on its technical merits in order to be recognized; and 2) the benefit is measured as the largest dollar amount of that position that is more likely than not to be sustained upon settlement. The difference between the benefit recognized for a position in this model and the tax benefit claimed on a tax return is treated as an unrecognized tax benefit. The Company recognizes income tax related interest and penalties in other non-interest expense. ​ o) Earnings per share ​ p) Interest Rate Swap Derivatives ​ The Company offers interest rate swap products to certain of its clients to manage potential changes in interest rates. Each contract between the Company and a client is offset with a contract between the Company and an institutional counterparty, thus minimizing the Company's exposure to rate changes. The Company's portfolio consists of a “matched book,” and as such, changes in fair value of the swap pairs will largely offset in earnings. In accordance with applicable accounting guidance, if certain conditions are met, a derivative may be designated as (1) a hedge of the exposure to changes in the fair value of a recognized asset or liability, or of an unrecognized firm commitment, that are attributable to a particular risk (referred to as a fair value hedge) or (2) a hedge of the exposure to variability in the cash flows of a recognized asset or liability, or of a forecasted transaction, that is attributable to a particular risk (referred to as a cash flow hedge). The Company documents all hedging relationships at the inception of each hedging relationship and uses industry accepted methodologies and ranges to determine the effectiveness of each hedge. The fair value of the hedged item is calculated using the estimated future cash flows of the hedged item and applying discount rates equal to the market interest rate for the hedged item at the inception of the hedging relationship (inception benchmark interest rate plus an inception credit spread), adjusted for changes in the designated benchmark interest rate thereafter. ​ q) Treasury stock to additional paid-in capital in the consolidated statements of financial condition. If the reissuance price is less than the cost basis (loss), the difference is recorded to additional paid-in capital to the extent there is a cumulative treasury stock paid-in capital balance. Any loss in excess of the cumulative treasury stock paid-in capital balance is charged to retained earnings. ​ r) Acquisition activities ​ Identifiable intangible assets are recognized separately if they arise from contractual or other legal rights or if they are separable (i.e., capable of being sold, transferred, licensed, rented, or exchanged separately from the entity). Deposit liabilities and the related depositor relationship intangible assets, known as the core deposit intangible assets, may be exchanged in observable exchange transactions. As a result, the core deposit intangible asset is considered identifiable, because the separability criterion has been met. ​

Recent Accounting Pronouncement

Recent Accounting Pronouncements	12 Months Ended
	Dec. 31, 2020
Recent Accounting Pronouncements
Recent Accounting Pronouncements	Note 3 Recent Accounting Pronouncements ​ Revenue from Contracts with Customers Revenue from Contracts with Customers Revenue Recognition The new guidance does not apply to revenue associated with financial assets and liabilities, including loans, leases, securities, and derivatives that are accounted for under other GAAP. Accordingly, the majority of the Company’s revenues are not affected. The Company adopted ASU 2014-09 on January 1, 2018 utilizing the modified retrospective approach. Additionally, the Company has determined certain service charges, bank card fees and real estate sales are within the scope of the ASU, but has not identified changes to the timing or amount of revenue recognition. Accounting policies and procedures did not change materially as the principles of revenue recognition from the ASU are largely consistent with existing guidance and current practices applied by the Company. Refer to note 15 of our consolidated financial statements for required disclosures under the new standard. ​ Leases Leases Leases liabilities ​ Financial Instruments - Credit Losses Measurement of Credit Losses on Financial Instruments ​ Derivatives and Hedging - Targeted Improvements to Accounting for Hedging Activities , Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities. ​ Reclassification of Certain Tax Effects Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. ​ Other Pronouncements Financial Instruments - Recognition and Measurement of Financial Assets and Financial Liabilities Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payment Intangibles - Goodwill and Other Simplifying the Test for Goodwill Impairment; Other Income – Gains and Losses from the Derecognition of Nonfinancial Assets Compensation – Stock Compensation Improvements to Nonemployee Share-Based Payment Accounting Fair Value Measurement Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement Intangibles – Goodwill and Other – Internal-Use Software: Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2020
Investment Securities
Investment Securities	Note 4 Investment Securities ​ The Company’s investment securities portfolio is comprised of available-for-sale and held-to-maturity investment securities. These investment securities totaled $1.0 billion at December 31, 2020 and included $0.6 billion of available-for-sale securities and $0.4 billion of held-to-maturity securities. At December 31, 2019, investment securities totaled $0.8 billion and included $0.6 billion of available-for-sale securities and $0.2 billion of held-to-maturity securities. ​ Available-for-sale ​ Available-for-sale securities are summarized as follows as of the dates indicated: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ Amortized Gross Gross ​ ​ ​ ​ cost ​ unrealized gains ​ unrealized losses ​ Fair value Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 193,424 ​ $ 2,952 ​ $ (42) ​ $ 196,334 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ 454,345 ​ 8,778 ​ (344) ​ 462,779 Municipal securities ​ ​ 362 ​ ​ 13 ​ ​ — ​ ​ 375 Corporate debt ​ ​ 2,000 ​ ​ — ​ ​ (2) ​ ​ 1,998 Other securities ​ 469 ​ — ​ — ​ 469 Total investment securities available-for-sale ​ $ 650,600 ​ $ 11,743 ​ $ (388) ​ $ 661,955 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ Amortized Gross Gross ​ ​ ​ ​ cost ​ unrealized gains ​ unrealized losses ​ Fair value Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 93,770 ​ $ 1,497 ​ $ (11) ​ $ 95,256 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ 543,275 ​ 3,818 ​ (5,056) ​ 542,037 Municipal securities ​ ​ 495 ​ ​ — ​ ​ (8) ​ ​ 487 Other securities ​ 469 ​ — ​ — ​ 469 Total investment securities available-for-sale ​ $ 638,009 ​ $ 5,315 ​ $ (5,075) ​ $ 638,249 ​ During 2020 and 2019, purchases of available-for-sale securities totaled $286.1 million and $45.7 million, respectively. Maturities and paydowns of available-for-sale securities during 2020 and 2019 totaled $271.5 million and $195.5 million, respectively. There were no sales of available-for-sale securities during 2020. Proceeds from sales of available-for-sale securities during 2019 totaled $20.4 million. ​ At December 31, 2020 and 2019, the Company’s available-for-sale investment portfolio was primarily comprised of mortgage-backed securities, and all mortgage-backed securities were backed by GSE collateral such as FHLMC and FNMA and the government owned agency GNMA. ​ The tables below summarize the available-for-sale securities with unrealized losses as of the dates shown, along with the length of the impairment period: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Less than 12 months ​ 12 months or more ​ Total ​ Fair Unrealized Fair Unrealized Fair Unrealized ​ ​ value ​ losses ​ value ​ losses ​ value ​ losses Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 26,878 ​ $ (42) ​ $ 1 ​ $ — ​ $ 26,879 ​ $ (42) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ ​ 95,888 ​ ​ (328) ​ ​ 2,138 ​ ​ (16) ​ ​ 98,026 ​ ​ (344) Corporate debt ​ ​ 1,998 ​ ​ (2) ​ ​ — ​ ​ — ​ ​ 1,998 ​ ​ (2) Total ​ $ 124,764 ​ $ (372) ​ $ 2,139 ​ $ (16) ​ $ 126,903 ​ $ (388) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ Less than 12 months ​ 12 months or more ​ Total ​ Fair Unrealized Fair Unrealized Fair Unrealized ​ ​ value ​ losses ​ value ​ losses ​ value ​ losses Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 10,413 ​ $ (7) ​ $ 1,421 ​ $ (4) ​ $ 11,834 ​ $ (11) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ 41,983 ​ ​ (281) ​ 254,380 ​ (4,775) ​ 296,363 ​ ​ (5,056) Municipal securities ​ ​ — ​ ​ — ​ ​ 372 ​ ​ (8) ​ ​ 372 ​ ​ (8) Total ​ $ 52,396 ​ $ (288) ​ $ 256,173 ​ $ (4,787) ​ $ 308,569 ​ $ (5,075) ​ Management evaluated all of the available-for-sale securities in an unrealized loss position at December 31, 2020 and December 31, 2019. The portfolio included 22 securities, which were in an unrealized loss position at December 31, 2020, compared to 67 securities at December 31, 2019. The unrealized losses in the Company’s investment portfolio at December 31, 2020 were caused by changes in interest rates. The Company has no intention to sell these securities and believes it will not be required to sell the securities before the recovery of their amortized cost. Management believes that default of the available-for-sale securities is highly unlikely. FHLMC, FNMA and GNMA guaranteed mortgage-backed securities have a long history of zero credit losses, an explicit guarantee by the U.S. government (although limited for FNMA and FHLMC securities) and yields that generally trade based on market views of prepayment and liquidity risk rather than credit risk. ​ Certain securities are pledged as collateral for public deposits, securities sold under agreements to repurchase and to secure borrowing capacity at the FRB, if needed. The fair value of available-for-sale investment securities pledged as collateral totaled $385.8 million and $352.3 million at December 31, 2020 and 2019, respectively. The Bank may also pledge available-for-sale investment securities as collateral for FHLB advances. No securities were pledged for this purpose at December 31, 2020, and securities totaling $13.6 million were pledged as collateral at December 31, 2019. ​ Mortgage-backed securities may have actual maturities that differ from contractual maturities depending on the repayment characteristics and experience of the underlying financial instruments. As of December 31, 2020, municipal securities of $0.1 million was due in one year or less and municipal securities of $0.3 million was due between one to five years. Corporate debt securities of $2.0 million were due after five years through ten years. Other securities of $0.5 million as of December 31, 2020 have no stated contractual maturity date. ​ As of December 31, 2020 and December 31, 2019, AIR from available-for-sale investment securities totaled $1.1 million and $1.3 million, respectively, and was included within other assets on the statements of financial condition. ​ Held-to-maturity ​ Held-to-maturity investment securities are summarized as follows as of the dates indicated: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ Gross Gross ​ ​ ​ ​ Amortized ​ unrealized ​ unrealized ​ ​ ​ ​ ​ cost ​ gains ​ losses ​ Fair value Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 306,187 ​ $ 4,940 ​ $ (197) ​ $ 310,930 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ 70,428 ​ 396 ​ (63) ​ 70,761 Total investment securities held-to-maturity ​ $ 376,615 ​ $ 5,336 ​ $ (260) ​ $ 381,691 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ Gross Gross ​ ​ ​ ​ Amortized ​ unrealized ​ unrealized ​ ​ ​ ​ ​ cost ​ gains ​ losses ​ Fair value Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 127,560 ​ $ 1,239 ​ $ (29) ​ $ 128,770 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ 55,324 ​ 82 ​ (435) ​ 54,971 Total investment securities held-to-maturity ​ $ 182,884 ​ $ 1,321 ​ $ (464) ​ $ 183,741 ​ During 2020 and 2019, purchases of held-to-maturity securities totaled $284.2 million and $10.2 million, respectively. Maturities and paydowns of held-to-maturity securities totaled $88.1 million and $60.9 million during 2020 and 2019, respectively. ​ The held-to-maturity portfolio included nine securities which were in an unrealized loss position at December 31, 2020, compared to 13 securities at December 31, 2019. The tables below summarize the held-to-maturity securities with unrealized losses as of the dates shown, along with the length of the impairment period: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Less than 12 months ​ 12 months or more ​ Total ​ Fair Unrealized Fair Unrealized Fair Unrealized ​ ​ value ​ losses ​ value ​ losses ​ value ​ losses Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 53,453 ​ $ (197) ​ $ — ​ $ — ​ $ 53,453 ​ $ (197) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ ​ 19,554 ​ ​ (63) ​ ​ — ​ ​ — ​ ​ 19,554 ​ ​ (63) Total ​ $ 73,007 ​ $ (260) ​ $ — ​ $ — ​ $ 73,007 ​ $ (260) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ Less than 12 months ​ 12 months or more ​ Total ​ Fair Unrealized Fair Unrealized Fair Unrealized ​ ​ value ​ losses ​ value ​ losses ​ value ​ losses Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 10,478 ​ $ (26) ​ $ 338 ​ $ (3) ​ $ 10,816 ​ $ (29) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ 3,925 ​ ​ (9) ​ ​ 28,554 ​ ​ (426) ​ 32,479 ​ ​ (435) Total ​ $ 14,403 ​ $ (35) ​ $ 28,892 ​ $ (429) ​ $ 43,295 ​ $ (464) ​ The Company does not measure expected credit losses on a financial asset, or group of financial assets, in which historical credit loss information adjusted for current conditions and reasonable and supportable forecasts results in an expectation that nonpayment of the amortized cost basis is zero. Management evaluated held-to-maturity securities noting they are backed by loans guaranteed by either U.S. government agencies or U.S. government sponsored entities, and management believes that default is highly unlikely given this governmental backing and long history without credit losses. Additionally, management notes that yields on which the portfolio generally trades are based upon market views of prepayment and liquidity risk and not credit risk. The Company has no intention to sell any held-to-maturity securities and believes it will not be required to sell any held-to-maturity securities before the recovery of their amortized cost. ​ Certain securities are pledged as collateral for public deposits, securities sold under agreements to repurchase and to secure borrowing capacity at the FRB, if needed. The carrying value of held-to-maturity investment securities pledged as collateral totaled $140.6 million and $144.2 million at December 31, 2020 and December 31, 2019, respectively. The Bank had no held-to-maturity investment securities pledged as collateral for FHLB advances at December 31, 2020 and $4.0 million of held-to-maturity investment securities pledged at the FHLB at December 31, 2019. ​ Actual maturities of mortgage-backed securities may differ from scheduled maturities depending on the repayment characteristics and experience of the underlying financial instruments. ​ As of December 31, 2020 and December 31, 2019, AIR from held-to-maturity investment securities totaled $0.7 million and $0.5 million, respectively, and was included within other assets on the statements of financial condition.

Non-marketable Securities

Non-marketable Securities	12 Months Ended
	Dec. 31, 2020
Non-marketable Securities
Non-marketable Securities	Note 5 Non-marketable Securities ​ Non-marketable securities include FRB stock and FHLB stock. At December 31, 2020, the Company held $13.9 million of FRB stock and $2.6 million of FHLB stock for regulatory or debt facility purposes. At December 31, 2019, the Company held $13.9 million of FRB stock and $15.8 million of FHLB stock. ​ These are restricted securities which, lacking a market, are carried at cost. There have been no identified events or changes in circumstances that may have an adverse effect on the investments carried at cost. ​

Loans

Loans	12 Months Ended
	Dec. 31, 2020
Loans
Loans	Note 6 Loans ​ The loan portfolio is comprised of loans originated by the Company and loans that were acquired in connection with the Company’s acquisitions. During the first quarter of 2020, the Company updated its loan classifications to include energy loans within the commercial and industrial loan class and present municipal and non-profit loans as their own class within the commercial segment. In addition, as the concept of impaired loans does not exist under CECL, disclosures that related solely to impaired loans have been removed. ​ The tables below show the loan portfolio composition including carrying value by segment as of the dates shown. The carrying value of loans is net of discounts, fees, costs and fair value marks of $16.2 million and $21.9 million at December 31, 2020 and 2019, respectively. Included in commercial loans are loans originated as part of the SBA’s Paycheck Protection Program of which $176.1 million, net of fees and costs, are outstanding at December 31, 2020, and are fully guaranteed by the SBA. ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ Total loans % of total Commercial $ 3,044,065 ​ 70.0% Commercial real estate non-owner occupied 631,996 ​ 14.5% Residential real estate 658,659 ​ 15.1% Consumer 19,006 ​ 0.4% Total $ 4,353,726 ​ 100.0% ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ Total loans % of total Commercial $ 2,992,307 ​ 67.8% Commercial real estate non-owner occupied 630,906 ​ 14.3% Residential real estate 770,417 ​ 17.4% Consumer 21,776 ​ 0.5% Total $ 4,415,406 ​ 100.0% ​ Information about delinquent and non-accrual loans is shown in the following tables at December 31, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ Greater ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 30-89 days ​ than 90 days ​ ​ ​ Total past ​ ​ ​ ​ ​ ​ past due and ​ past due and ​ Non-accrual ​ due and ​ ​ ​ ​ ​ ​ accruing ​ accruing ​ loans ​ non-accrual ​ Current ​ Total loans Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ $ 170 ​ $ — ​ $ 6,312 ​ $ 6,482 ​ $ 1,440,256 ​ $ 1,446,738 Municipal and non-profit ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 870,791 ​ ​ 870,791 Owner occupied commercial real estate ​ ​ — ​ ​ — ​ ​ 5,450 ​ ​ 5,450 ​ ​ 510,789 ​ ​ 516,239 Food and agribusiness ​ ​ 146 ​ ​ — ​ ​ 422 ​ ​ 568 ​ ​ 209,729 ​ ​ 210,297 Total commercial ​ ​ 316 ​ ​ — ​ ​ 12,184 ​ ​ 12,500 ​ ​ 3,031,565 ​ ​ 3,044,065 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ — ​ — ​ — ​ — ​ 91,125 ​ 91,125 Acquisition/development ​ — ​ — ​ 6 ​ 6 ​ 24,665 ​ 24,671 Multifamily ​ — ​ — ​ 1,523 ​ 1,523 ​ 67,233 ​ 68,756 Non-owner occupied ​ — ​ — ​ 135 ​ 135 ​ 447,309 ​ 447,444 Total commercial real estate ​ — ​ — ​ 1,664 ​ 1,664 ​ 630,332 ​ 631,996 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ ​ 527 ​ ​ 160 ​ ​ 5,820 ​ ​ 6,507 ​ ​ 577,764 ​ ​ 584,271 Junior lien ​ 95 ​ ​ — ​ ​ 709 ​ 804 ​ 73,584 ​ ​ 74,388 Total residential real estate ​ 622 ​ ​ 160 ​ ​ 6,529 ​ ​ 7,311 ​ ​ 651,348 ​ ​ 658,659 Consumer ​ 30 ​ 2 ​ 10 ​ 42 ​ 18,964 ​ 19,006 Total loans ​ $ 968 ​ $ 162 ​ $ 20,387 ​ $ 21,517 ​ $ 4,332,209 ​ $ 4,353,726 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ Non-accrual loans ​ Non-accrual loans ​ ​ ​ ​ with a related ​ with no related ​ ​ ​ ​ allowance for ​ allowance for ​ Non-accrual ​ credit loss ​ credit loss ​ loans Commercial: ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial $ 6,080 ​ $ 232 ​ $ 6,312 Municipal and non-profit ​ — ​ ​ — ​ ​ — Owner occupied commercial real estate ​ 2,698 ​ ​ 2,752 ​ ​ 5,450 Food and agribusiness ​ 88 ​ ​ 334 ​ ​ 422 Total commercial ​ 8,866 ​ ​ 3,318 ​ ​ 12,184 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ Construction — ​ — ​ — Acquisition/development 6 ​ — ​ 6 Multifamily — ​ 1,523 ​ 1,523 Non-owner occupied 135 ​ — ​ 135 Total commercial real estate 141 ​ 1,523 ​ 1,664 Residential real estate: ​ ​ ​ ​ ​ Senior lien ​ 4,158 ​ ​ 1,662 ​ ​ 5,820 Junior lien ​ 709 ​ ​ — ​ 709 Total residential real estate ​ 4,867 ​ ​ 1,662 ​ 6,529 Consumer 10 ​ — ​ 10 Total loans $ 13,884 ​ $ 6,503 ​ $ 20,387 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ ​ Greater ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 30-89 days ​ than 90 days ​ ​ ​ Total past ​ ​ ​ ​ ​ ​ past due and ​ past due and ​ Non-accrual ​ due and ​ ​ ​ ​ ​ ​ accruing ​ accruing ​ loans ​ non-accrual ​ Current ​ Total loans Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ $ 2,251 ​ $ 879 ​ $ 10,330 ​ $ 13,460 ​ $ 1,398,071 ​ $ 1,411,531 Municipal and non-profit ​ ​ 226 ​ ​ — ​ ​ — ​ ​ 226 ​ ​ 837,300 ​ ​ 837,526 Owner occupied commercial real estate ​ 595 ​ 630 ​ ​ 2,264 ​ 3,489 ​ 486,633 ​ 490,122 Food and agribusiness ​ 190 ​ — ​ ​ 317 ​ 507 ​ 252,621 ​ 253,128 Total commercial ​ ​ 3,262 ​ ​ 1,509 ​ ​ 12,911 ​ ​ 17,682 ​ ​ 2,974,625 ​ ​ 2,992,307 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ — ​ — ​ — ​ — ​ 77,733 ​ 77,733 Acquisition/development ​ 187 ​ — ​ 416 ​ 603 ​ 26,276 ​ 26,879 Multifamily ​ — ​ — ​ — ​ — ​ 55,808 ​ 55,808 Non-owner occupied ​ 438 ​ 65 ​ 43 ​ 546 ​ 469,940 ​ 470,486 Total commercial real estate ​ 625 ​ 65 ​ 459 ​ 1,149 ​ 629,757 ​ 630,906 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ 2,101 ​ 9 ​ ​ 7,597 ​ 9,707 ​ 668,955 ​ ​ 678,662 Junior lien ​ 245 ​ 79 ​ ​ 731 ​ ​ 1,055 ​ ​ 90,700 ​ ​ 91,755 Total residential real estate ​ 2,346 ​ 88 ​ ​ 8,328 ​ ​ 10,762 ​ ​ 759,655 ​ ​ 770,417 Consumer ​ 116 ​ — ​ 50 ​ ​ 166 ​ ​ 21,610 ​ ​ 21,776 Total loans ​ $ 6,349 ​ $ 1,662 ​ $ 21,748 ​ $ 29,759 ​ $ 4,385,647 ​ $ 4,415,406 ​ Loans are considered past due or delinquent when the contractual principal or interest due in accordance with the terms of the loan agreement remains unpaid after the due date of the scheduled payment. Non-accrual loans include non-accrual loans and TDRs on non-accrual status. There was no interest income recognized from non-accrual loans during the years ended December 31, 2020 and 2019. ​ The Company’s internal risk rating system uses a series of grades, which reflect our assessment of the credit quality of loans based on an analysis of the borrower's financial condition, liquidity and ability to meet contractual debt service requirements and are categorized as “Pass”, “Special mention”, “Substandard” and “Doubtful”. For a description of the general characteristics of the risk grades, refer to note 2 Summary of Significant Accounting Policies. ​ The amortized cost basis for all loans as determined by the Company’s internal risk rating system and year of origination was as follows at December 31, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ Revolving ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ loans ​ loans ​ ​ ​ ​ ​ Origination year ​ amortized ​ converted ​ ​ ​ ​ ​ 2020 ​ 2019 ​ 2018 ​ 2017 ​ 2016 ​ Prior ​ cost basis ​ to term ​ Total Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 372,041 ​ $ 212,388 ​ $ 189,753 ​ $ 93,822 ​ $ 15,145 ​ $ 17,662 ​ $ 499,283 ​ $ 991 ​ $ 1,401,085 Special mention ​ ​ — ​ ​ 1,445 ​ ​ 7,381 ​ ​ 4,845 ​ ​ 5,810 ​ ​ 729 ​ ​ 2,329 ​ ​ 1,478 ​ ​ 24,017 Substandard ​ ​ 23 ​ ​ 1,238 ​ ​ 925 ​ ​ 11,885 ​ ​ 56 ​ ​ 4,840 ​ ​ 1,341 ​ ​ — ​ ​ 20,308 Doubtful ​ ​ — ​ ​ — ​ ​ 34 ​ ​ 456 ​ ​ — ​ ​ 809 ​ ​ 29 ​ ​ — ​ ​ 1,328 Total commercial and industrial ​ ​ 372,064 ​ ​ 215,071 ​ ​ 198,093 ​ ​ 111,008 ​ ​ 21,011 ​ ​ 24,040 ​ ​ 502,982 ​ ​ 2,469 ​ ​ 1,446,738 Municipal and non-profit: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 131,961 ​ ​ 91,911 ​ ​ 125,247 ​ ​ 156,275 ​ ​ 124,269 ​ ​ 238,453 ​ ​ 2,675 ​ ​ — ​ ​ 870,791 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total municipal and non-profit ​ ​ 131,961 ​ ​ 91,911 ​ ​ 125,247 ​ ​ 156,275 ​ ​ 124,269 ​ ​ 238,453 ​ ​ 2,675 ​ ​ — ​ ​ 870,791 Owner occupied commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 100,791 ​ ​ 107,558 ​ ​ 90,398 ​ ​ 53,131 ​ ​ 32,648 ​ ​ 87,758 ​ ​ 1,401 ​ ​ — ​ ​ 473,685 Special mention ​ ​ 1,581 ​ ​ 2,236 ​ ​ 2,714 ​ ​ 544 ​ ​ 3,254 ​ ​ 19,341 ​ ​ — ​ ​ — ​ ​ 29,670 Substandard ​ ​ — ​ ​ 1,988 ​ ​ 6,211 ​ ​ 251 ​ ​ 93 ​ ​ 3,802 ​ ​ — ​ ​ — ​ ​ 12,345 Doubtful ​ ​ — ​ ​ 511 ​ ​ — ​ ​ — ​ ​ — ​ ​ 28 ​ ​ — ​ ​ — ​ ​ 539 Total owner occupied commercial real estate ​ ​ 102,372 ​ ​ 112,293 ​ ​ 99,323 ​ ​ 53,926 ​ ​ 35,995 ​ ​ 110,929 ​ ​ 1,401 ​ ​ — ​ ​ 516,239 Food and agribusiness: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 28,139 ​ ​ 9,198 ​ ​ 20,242 ​ ​ 7,198 ​ ​ 9,556 ​ ​ 28,330 ​ ​ 106,007 ​ ​ 126 ​ ​ 208,796 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 222 ​ ​ — ​ ​ — ​ ​ 222 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ 302 ​ ​ — ​ ​ 977 ​ ​ — ​ ​ — ​ ​ 1,279 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total food and agribusiness ​ ​ 28,139 ​ ​ 9,198 ​ ​ 20,242 ​ ​ 7,500 ​ ​ 9,556 ​ ​ 29,529 ​ ​ 106,007 ​ ​ 126 ​ ​ 210,297 Total commercial ​ ​ 634,536 ​ ​ 428,473 ​ ​ 442,905 ​ ​ 328,709 ​ ​ 190,831 ​ ​ 402,951 ​ ​ 613,065 ​ ​ 2,595 ​ ​ 3,044,065 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 15,841 ​ ​ 49,658 ​ ​ 17,349 ​ ​ 4,072 ​ ​ — ​ ​ — ​ ​ 2,006 ​ ​ 1,807 ​ ​ 90,733 Special mention ​ ​ 392 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 392 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total construction ​ ​ 16,233 ​ ​ 49,658 ​ ​ 17,349 ​ ​ 4,072 ​ ​ — ​ ​ — ​ ​ 2,006 ​ ​ 1,807 ​ ​ 91,125 Acquisition/development: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 3,762 ​ ​ 1,997 ​ ​ 1,947 ​ ​ 8,373 ​ ​ 4,559 ​ ​ 3,694 ​ ​ 11 ​ ​ — ​ ​ 24,343 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ 34 ​ ​ — ​ ​ 253 ​ ​ — ​ ​ — ​ ​ 287 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 41 ​ ​ — ​ ​ — ​ ​ 41 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total acquisition/development ​ ​ 3,762 ​ ​ 1,997 ​ ​ 1,947 ​ ​ 8,407 ​ ​ 4,559 ​ ​ 3,988 ​ ​ 11 ​ ​ — ​ ​ 24,671 Multifamily: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 29,738 ​ ​ 13,670 ​ ​ 137 ​ ​ 212 ​ ​ 18,050 ​ ​ 4,990 ​ ​ — ​ ​ — ​ ​ 66,797 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 436 ​ ​ — ​ ​ — ​ ​ 436 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,523 ​ ​ — ​ ​ — ​ ​ 1,523 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total multifamily ​ ​ 29,738 ​ ​ 13,670 ​ ​ 137 ​ ​ 212 ​ ​ 18,050 ​ ​ 6,949 ​ ​ — ​ ​ — ​ ​ 68,756 Non-owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 51,445 ​ ​ 92,225 ​ ​ 25,362 ​ ​ 86,975 ​ ​ 26,613 ​ ​ 118,144 ​ ​ 3,083 ​ ​ 643 ​ ​ 404,490 Special mention ​ ​ 70 ​ ​ 5,458 ​ ​ 5,841 ​ ​ 22,737 ​ ​ — ​ ​ 3,662 ​ ​ 100 ​ ​ — ​ ​ 37,868 Substandard ​ ​ — ​ ​ — ​ ​ 779 ​ ​ — ​ ​ 3,937 ​ ​ 370 ​ ​ — ​ ​ — ​ ​ 5,086 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total non-owner occupied ​ ​ 51,515 ​ ​ 97,683 ​ ​ 31,982 ​ ​ 109,712 ​ ​ 30,550 ​ ​ 122,176 ​ ​ 3,183 ​ ​ 643 ​ ​ 447,444 Total commercial real estate non-owner occupied ​ ​ 101,248 ​ ​ 163,008 ​ ​ 51,415 ​ ​ 122,403 ​ ​ 53,159 ​ ​ 133,113 ​ ​ 5,200 ​ ​ 2,450 ​ ​ 631,996 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ Revolving ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ loans ​ loans ​ ​ ​ ​ ​ Origination year ​ amortized ​ converted ​ ​ ​ ​ ​ 2020 ​ 2019 ​ 2018 ​ 2017 ​ 2016 ​ Prior ​ cost basis ​ to term ​ Total Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 129,551 ​ ​ 76,504 ​ ​ 36,493 ​ ​ 47,887 ​ ​ 88,358 ​ ​ 173,091 ​ ​ 24,884 ​ ​ 218 ​ ​ 576,986 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 463 ​ ​ — ​ ​ — ​ ​ 463 Substandard ​ ​ 95 ​ ​ 818 ​ ​ 20 ​ ​ 1,232 ​ ​ 550 ​ ​ 4,107 ​ ​ — ​ ​ — ​ ​ 6,822 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total senior lien ​ ​ 129,646 ​ ​ 77,322 ​ ​ 36,513 ​ ​ 49,119 ​ ​ 88,908 ​ ​ 177,661 ​ ​ 24,884 ​ ​ 218 ​ ​ 584,271 Junior lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 3,479 ​ ​ 4,217 ​ ​ 2,553 ​ ​ 1,775 ​ ​ 1,226 ​ ​ 3,760 ​ ​ 55,860 ​ ​ 365 ​ ​ 73,235 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 21 ​ ​ 341 ​ ​ — ​ ​ 362 Substandard ​ ​ — ​ ​ 112 ​ ​ 101 ​ ​ 177 ​ ​ 55 ​ ​ 287 ​ ​ — ​ ​ 59 ​ ​ 791 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total junior lien ​ ​ 3,479 ​ ​ 4,329 ​ ​ 2,654 ​ ​ 1,952 ​ ​ 1,281 ​ ​ 4,068 ​ ​ 56,201 ​ ​ 424 ​ ​ 74,388 Total residential real estate ​ ​ 133,125 ​ ​ 81,651 ​ ​ 39,167 ​ ​ 51,071 ​ ​ 90,189 ​ ​ 181,729 ​ ​ 81,085 ​ ​ 642 ​ ​ 658,659 Consumer ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 9,777 ​ ​ 3,348 ​ ​ 1,674 ​ ​ 489 ​ ​ 329 ​ ​ 623 ​ ​ 2,700 ​ ​ 19 ​ ​ 18,959 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Substandard ​ ​ — ​ ​ — ​ ​ 37 ​ ​ — ​ ​ 2 ​ ​ 8 ​ ​ — ​ ​ — ​ ​ 47 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total consumer ​ ​ 9,777 ​ ​ 3,348 ​ ​ 1,711 ​ ​ 489 ​ ​ 331 ​ ​ 631 ​ ​ 2,700 ​ ​ 19 ​ ​ 19,006 Total loans ​ $ 878,686 ​ $ 676,480 ​ $ 535,198 ​ $ 502,672 ​ $ 334,510 ​ $ 718,424 ​ $ 702,050 ​ $ 5,706 ​ $ 4,353,726 ​ Credit exposure for all loans as determined by the Company’s internal risk rating system was as follows at December 31, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ Special ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ mention ​ Substandard ​ Doubtful ​ Total Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ $ 1,366,457 ​ $ 28,226 ​ $ 15,132 ​ $ 1,716 ​ $ 1,411,531 Municipal and non-profit ​ ​ 837,526 ​ ​ — ​ ​ — ​ ​ — ​ ​ 837,526 Owner occupied commercial real estate ​ 439,315 ​ ​ 39,986 ​ ​ 10,821 ​ ​ — ​ 490,122 Food and agribusiness ​ 249,930 ​ ​ 1,408 ​ ​ 1,758 ​ ​ 32 ​ ​ 253,128 Total commercial ​ ​ 2,893,228 ​ ​ 69,620 ​ ​ 27,711 ​ ​ 1,748 ​ ​ 2,992,307 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ 77,733 ​ ​ — ​ ​ — ​ ​ — ​ 77,733 Acquisition/development ​ 26,229 ​ ​ — ​ ​ 650 ​ ​ — ​ 26,879 Multifamily ​ 55,325 ​ ​ — ​ ​ 483 ​ ​ — ​ 55,808 Non-owner occupied ​ 454,045 ​ ​ 15,307 ​ ​ 1,134 ​ ​ — ​ 470,486 Total commercial real estate ​ 613,332 ​ ​ 15,307 ​ ​ 2,267 ​ ​ — ​ 630,906 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ 668,452 ​ ​ 441 ​ ​ 9,769 ​ ​ — ​ 678,662 Junior lien ​ 90,540 ​ ​ 365 ​ ​ 850 ​ ​ — ​ 91,755 Total residential real estate ​ 758,992 ​ 806 ​ 10,619 ​ — ​ 770,417 Consumer ​ 21,725 ​ ​ 1 ​ ​ 50 ​ ​ — ​ ​ 21,776 Total loans ​ $ 4,287,277 ​ $ 85,734 ​ $ 40,647 ​ $ 1,748 ​ $ 4,415,406 ​ Loans evaluated individually ​ We evaluate loans individually when they no longer share risk characteristics with pooled loans. These loans include loans on non-accrual status, loans in bankruptcy, and TDRs described below. If a specific allowance is warranted based on the borrower’s overall financial condition, the specific allowance is calculated based on discounted expected cash flows using the loan’s initial contractual effective interest rate or the fair value of the collateral less selling costs for collateral-dependent loans. ​ A loan is considered collateral-dependent when the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the operation or sale of the collateral. Management individually evaluates collateral-dependent loans with an amortized cost basis of $250 thousand or more and includes collateral-dependent loans less than $250 thousand within the general allowance population. The amortized cost basis of collateral-dependent loans over $250 thousand was as follows at December 31, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ Total amortized ​ Real property ​ Business assets ​ cost basis Commercial ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial $ 7,579 ​ $ 3,005 ​ $ 10,584 Owner-occupied commercial real estate ​ 3,701 ​ ​ 284 ​ ​ 3,985 Food and agribusiness ​ 334 ​ ​ — ​ ​ 334 Total Commercial ​ 11,614 ​ ​ 3,289 ​ ​ 14,903 Commercial real estate non owner-occupied ​ ​ ​ ​ ​ ​ ​ ​ Acquisition/development 1,573 ​ — ​ 1,573 Multifamily 1,523 ​ — ​ 1,523 Total commercial real estate 3,096 ​ — ​ 3,096 Residential real estate ​ ​ ​ ​ ​ Senior lien 2,021 ​ — ​ 2,021 Total residential real estate 2,021 ​ — ​ 2,021 Total loans $ 16,731 ​ $ 3,289 ​ $ 20,020 ​ Impaired Loans ​ During 2019 and 2018, prior to the adoption of ASU 2016-13, loans were considered to be impaired when it was probable that the Company would not be able to collect all amounts due in accordance with the contractual terms of the loan agreement. Impaired loans were comprised of originated and acquired loans on non-accrual status, loans in bankruptcy, and TDRs described below. If a specific allowance was warranted based on the borrower’s overall financial condition, the specific allowance was calculated based on discounted cash flows using the loan’s initial contractual effective interest rate or the fair value of the collateral less selling costs for collateral dependent loans. ​ At December 31, 2019 and 2018, the Company’s recorded investment in impaired loans was $32.8 million and $31.1 million, respectively, of which $6.9 million and $4.1 million, respectively, were accruing TDRs. Impaired loans had a collective related allowance allocated to them of $1.8 million and $1.2 million at December 31, 2019 and 2018, respectively. ​ Additional information regarding impaired loans at December 31, 2019 and 2018 is set forth in the table below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ December 31, 2018 ​ ​ Unpaid ​ ​ ​ ​ Allowance ​ Unpaid ​ ​ ​ ​ Allowance ​ ​ principal ​ Recorded ​ for losses ​ principal ​ Recorded ​ for losses ​ ​ balance ​ investment ​ allocated ​ balance ​ investment ​ allocated With no related allowance recorded: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ $ 16,001 ​ $ 10,548 ​ $ — ​ $ 9,740 ​ $ 3,771 ​ $ — Municipal and non-profit ​ — ​ — ​ — ​ — ​ — ​ — Owner occupied commercial real estate ​ 3,265 ​ 2,385 ​ — ​ 7,130 ​ 6,609 ​ — Food and agribusiness ​ ​ 1,468 ​ 1,220 ​ — ​ ​ 1,468 ​ 1,260 ​ — Total commercial ​ ​ 20,734 ​ 14,153 ​ — ​ ​ 18,338 ​ 11,640 ​ — Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ — ​ — ​ — ​ 1,435 ​ 1,208 ​ — Acquisition/development ​ 458 ​ 415 ​ — ​ 378 ​ 121 ​ — Multifamily ​ — ​ — ​ — ​ — ​ — ​ — Non-owner occupied ​ 90 ​ 26 ​ — ​ 641 ​ 547 ​ — Total commercial real estate ​ 548 ​ 441 ​ — ​ 2,454 ​ 1,876 ​ — Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ 4,355 ​ 3,967 ​ — ​ 4,229 ​ 3,814 ​ — Junior lien ​ 311 ​ 269 ​ — ​ 409 ​ 341 ​ — Total residential real estate ​ 4,666 ​ 4,236 ​ — ​ 4,638 ​ 4,155 ​ — Consumer ​ 57 ​ 50 ​ — ​ 46 ​ 42 ​ — Total impaired loans with no related allowance recorded ​ $ 26,005 ​ $ 18,880 ​ $ — ​ $ 25,476 ​ $ 17,713 ​ $ — With a related allowance recorded: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ $ 13,768 ​ $ 6,435 ​ $ 1,725 ​ $ 7,252 ​ $ 4,627 ​ $ 996 Municipal and non-profit ​ — ​ — ​ — ​ — ​ — ​ — Owner occupied commercial real estate ​ 711 ​ 505 ​ 3 ​ 1,362 ​ 1,169 ​ 90 Food and agribusiness ​ ​ 757 ​ ​ 751 ​ ​ 35 ​ ​ 883 ​ ​ 845 ​ ​ 46 Total commercial ​ ​ 15,236 ​ 7,691 ​ 1,763 ​ ​ 9,497 ​ 6,641 ​ 1,132 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ — ​ — ​ — ​ — ​ — ​ — Acquisition/development ​ — ​ — ​ — ​ — ​ — ​ — Multifamily ​ — ​ — ​ — ​ — ​ — ​ — Non-owner occupied ​ 232 ​ 171 ​ 1 ​ 313 ​ 254 ​ 2 Total commercial real estate ​ 232 ​ 171 ​ 1 ​ 313 ​ 254 ​ 2 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ 5,808 ​ 5,034 ​ 25 ​ 6,032 ​ 5,178 ​ 27 Junior lien ​ 1,074 ​ 987 ​ 6 ​ 1,408 ​ 1,293 ​ 8 Total residential real estate ​ 6,882 ​ 6,021 ​ 31 ​ 7,440 ​ 6,471 ​ 35 Consumer ​ — ​ — ​ — ​ — ​ — ​ — Total impaired loans with a related allowance recorded ​ $ 22,350 ​ $ 13,883 ​ $ 1,795 ​ $ 17,250 ​ $ 13,366 ​ $ 1,169 Total impaired loans ​ $ 48,355 ​ $ 32,763 ​ $ 1,795 ​ $ 42,726 ​ $ 31,079 ​ $ 1,169 ​ The table below shows additional information regarding the average recorded investment and interest income recognized on impaired loans for the years presented: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended ​ ​ December 31, 2019 ​ December 31, 2018 ​ ​ Average Interest Average Interest With no related allowance recorded: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ $ 13,062 ​ $ 248 ​ $ 4,132 ​ $ 168 Municipal and non-profit ​ — ​ — ​ — ​ — Owner occupied commercial real estate ​ 2,849 ​ 27 ​ 6,799 ​ 38 Food and agribusiness ​ ​ 1,316 ​ ​ — ​ ​ 1,259 ​ ​ 98 Total commercial ​ ​ 17,227 ​ ​ 275 ​ ​ 12,190 ​ ​ 304 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ — ​ — ​ 1,208 ​ — Acquisition/development ​ 575 ​ — ​ 606 ​ — Multifamily ​ — ​ — ​ — ​ — Non-owner occupied ​ 28 ​ — ​ 573 ​ — Total commercial real estate ​ 603 ​ ​ — ​ 2,387 ​ ​ — Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ 4,081 ​ 1 ​ 3,904 ​ 0 Junior lien ​ 287 ​ 2 ​ 355 ​ 2 Total residential real estate ​ 4,368 ​ ​ 3 ​ 4,259 ​ ​ 2 Consumer ​ 11 ​ — ​ 12 ​ — Total impaired loans with no related allowance recorded ​ $ 22,209 ​ $ 278 ​ $ 18,848 ​ $ 306 With a related allowance recorded: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ $ 6,653 ​ $ — ​ $ 4,677 ​ $ — Municipal and non-profit ​ 554 ​ 17 ​ 1,220 ​ 19 Owner occupied commercial real estate ​ 796 ​ 12 ​ 862 ​ 5 Food and agribusiness ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total commercial ​ ​ 8,003 ​ ​ 29 ​ ​ 6,759 ​ ​ 24 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ — ​ — ​ — ​ — Acquisition/development ​ — ​ — ​ — ​ — Multifamily ​ — ​ — ​ — ​ — Non-owner occupied ​ 207 ​ 14 ​ 288 ​ 16 Total commercial real estate ​ 207 ​ ​ 14 ​ 288 ​ ​ 16 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ 5,241 ​ 66 ​ 5,412 ​ 57 Junior lien ​ 1,034 ​ 34 ​ 1,331 ​ 43 Total residential real estate ​ 6,275 ​ ​ 100 ​ 6,743 ​ ​ 100 Consumer ​ 49 ​ — ​ 36 ​ — Total impaired loans with a related allowance recorded ​ $ 14,534 ​ $ 143 ​ $ 13,826 ​ $ 140 Total impaired loans ​ $ 36,743 ​ $ 421 ​ $ 32,674 ​ $ 446 ​ Interest income recognized on impaired loans noted in the tables above, primarily represents interest earned on accruing TDRs. Interest income recognized on impaired loans during the years ended December 31, 2019 and 2018 was $0.4 million and $0.4 million, respectively. ​ Loan modifications and troubled debt restructurings ​ The Company’s policy is to review each prospective credit to determine the appropriateness and the adequacy of security or collateral prior to making a loan. In the event of borrower default, the Company seeks recovery in compliance with lending laws, the respective loan agreements, and credit monitoring and remediation procedures that may include restructuring a loan to provide a concession by the Company to the borrower from their original terms due to borrower financial difficulties in order to facilitate repayment. Additionally, if a borrower’s repayment obligation has been discharged by a court, and that debt has not been reaffirmed by the borrower, regardless of past due status, the loan is considered to be a TDR. ​ The CARES Act afforded financial institutions the option to modify loans within certain parameters in response to the COVID-19 pandemic without requiring the modifications to be classified as TDRs under ASC Topic 310 if the borrower has been adversely impacted by COVID-19 and was current on their loan payments. During 2020, the Company modified 510 loans totaling $519.0 million due to the effects of the COVID-19 pandemic that were not classified as TDRs. Of those loans, $345.4 million have resumed making principal or interest payments or paid in full as of December 31, 2020. Modified loans that remained on a payment deferral plan at December 31, 2020 totaled $173.6 million, or 4.0% of the total loan portfolio, of which 26.2% were a subsequent modification. Of those loans, principal payment deferrals totaled $167.1 million and full payment deferrals totaled $6.5 million. All COVID modified loans were classified as performing as of December 31, 2020. ​ During 2020, the Company restructured 24 loans with an amortized cost basis of $10.8 million to facilitate repayment that are considered TDRs. Included in the total TDR balance as of December 31, 2020 were loans totaling $4.2 million previously accounted for under ASC 310-30. Loan modifications were a reduction of the principal payment, a reduction in interest rate, or an extension of term. ​ The tables below provide additional information related to accruing TDRs at December 31, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Amortized ​ Average year-to-date ​ Unpaid ​ Unfunded commitments ​ ​ cost basis ​ amortized cost basis ​ principal balance ​ to fund TDRs Commercial ​ $ 9,387 ​ $ 9,544 ​ $ 9,978 ​ $ 150 Commercial real estate non-owner occupied ​ 2,400 ​ 2,351 ​ 4,105 ​ — Residential real estate ​ 2,121 ​ 2,185 ​ 2,922 ​ 12 Consumer ​ 37 ​ 37 ​ 37 ​ — Total ​ $ 13,945 ​ $ 14,117 ​ $ 17,042 ​ $ 162 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ Recorded ​ Average year-to-date ​ Unpaid ​ Unfunded commitments ​ ​ investment ​ recorded investment ​ principal balance ​ to fund TDRs Commercial ​ $ 5,615 ​ $ 5,788 ​ $ 5,714 ​ $ — Commercial real estate non-owner occupied ​ 141 ​ 172 ​ 192 ​ — Residential real estate ​ 1,129 ​ 1,178 ​ 1,206 ​ 12 Consumer ​ — ​ — ​ — ​ — Total ​ $ 6,885 ​ $ 7,138 ​ $ 7,112 ​ $ 12 ​ The following table summarizes the Company’s carrying value of non-accrual TDRs as of December 31, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ December 31, 2019 Commercial $ 3,397 $ 1,891 Commercial real estate non-owner occupied ​ 1,644 ​ 410 Residential real estate ​ 3,156 ​ 2,553 Consumer ​ — ​ — Total non-accruing TDRs ​ $ 8,197 ​ $ 4,854 ​ Accrual of interest is resumed on loans that were previously on non-accrual only after the loan has performed sufficiently for a period of time. The Company had three TDRs totaling $3.4 million that were modified within the past 12 months and had defaulted on their restructured terms during the year ended December 31, 2020. ​ During 2019, the Company had two TDRs totaling $0.7 million that had been modified within the prior twelve months and defaulted on their restructured terms. For purposes of this disclosure, the Company considers “default” to mean 90 days or more past due on principal or interest. The allowance for credit losses related to TDRs on non-accrual status is determined by individual evaluation, including collateral adequacy, using the same process as loans on non-accrual status which are not classified as TDRs. ​

Allowance for Credit Losses

Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2020
Allowance for Credit Losses
Allowance for Credit Losses	Note 7 Allowance for Credit Losses ​ The tables below detail the Company’s allowance for credit losses as of the dates shown: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2020 ​ ​ ​ ​ Non-owner ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ commercial ​ Residential ​ ​ ​ ​ ​ ​ ​ Commercial ​ real estate ​ real estate ​ Consumer ​ Total Beginning balance ​ $ 30,442 ​ $ 4,850 ​ $ 3,468 ​ $ 304 ​ $ 39,064 Cumulative effect adjustment (1) ​ ​ (1,299) ​ ​ 1,666 ​ ​ 5,314 ​ ​ 155 ​ ​ 5,836 Charge-offs ​ (2,023) ​ (412) ​ (67) ​ (726) ​ (3,228) Recoveries ​ 394 ​ — ​ 32 ​ 145 ​ 571 Provision ​ 2,862 ​ 11,344 ​ 2,745 ​ 583 ​ 17,534 Ending balance ​ 30,376 ​ 17,448 ​ 11,492 ​ 461 ​ 59,777 ​ ​ ​ ​ (1) ​ Related to the adoption of Accounting Standards Update No. 2016-13, Measurement of Credit Losses on Financial Instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2019 ​ ​ ​ ​ Non-owner ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ commercial ​ Residential ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ real estate ​ real estate ​ Consumer ​ Total Beginning balance ​ $ 27,137 ​ $ 4,406 ​ $ 3,800 ​ $ 349 ​ $ 35,692 Charge-offs ​ (7,422) ​ (116) ​ (124) ​ (937) ​ (8,599) Recoveries ​ 102 ​ 12 ​ 34 ​ 180 ​ 328 Provision ​ 10,625 ​ 548 ​ (242) ​ 712 ​ 11,643 Ending balance ​ 30,442 ​ 4,850 ​ 3,468 ​ 304 ​ 39,064 ​ In evaluating the loan portfolio for an appropriate ACL level, excluding loans evaluated individually, loans were grouped into segments based on broad characteristics such as primary use and underlying collateral. Within the segments, the portfolio was further disaggregated into classes of loans with similar attributes and risk characteristics for purposes of developing the underlying data used within the discounted cash flow model including, but not limited to, prepayment and recovery rates as well as loss rates tied to macro-economic conditions within management’s reasonable and supportable forecast. The ACL also includes subjective adjustments based upon qualitative risk factors including asset quality, loss trends, lending management, portfolio growth and loan review/internal audit results. ​ Net charge-offs on loans during 2020 were $2.7 million. Provision for loan losses of $17.6 million, including $0.1 million for unfunded loan commitment reserves, was recorded during the year ended December 31, 2020 to provide coverage for the impact of deteriorating economic conditions as a result of COVID-19. ​ Provision for loan losses totaled $11.6 million for the year ended December 31, 2019 to support originated loan growth. ​ The Company has elected to exclude AIR from the allowance for credit losses calculation. As of December 31, 2020 and December 31, 2019, AIR from loans totaled $16.7 million and $17.2 million, respectively.

Leases

Leases	12 Months Ended
	Dec. 31, 2020
Leases
Leases	Note 8 Leases ​ Right-of-use (“ROU”) lease assets totaled $25.4 million and $29.2 million as of December 31, 2020 and 2019, respectively, and were included in other assets on the consolidated statements of financial condition. The related lease liabilities totaled $26.0 million and $29.5 million as of December 31, 2020 and 2019, respectively, and were included in other liabilities on the consolidated statements of financial condition. ​ The ROU assets represent the Company’s right to use, or control the use of, an underlying asset for the lease term and the lease liabilities represent the Company’s obligation to make lease payments arising from the lease terms. The updates did not significantly change lease accounting requirements applicable to lessors and did not significantly impact our financial statements in relation to contracts whereby we act as a lessor. ​ The Company has operating leases for banking centers, corporate offices and ATM locations, with remaining lease terms ranging from one year to ten years. The Company only included reasonably certain renewal options in the lease terms. The weighted-average remaining lease term for our operating leases was 5.4 years and 5.1 years at December 31, 2020 and 2019, respectively. As of December 31, 2020 and 2019, the weighted-average discount rate was 3.36% and 3.36%, respectively, utilizing the Company’s incremental FHLB borrowing rate for borrowings of a similar term at the date of lease commencement. ​ Rent expense totaled $5.7 million and $5.7 million for the years ended December 31, 2020 and 2019, respectively, and was recorded within occupancy and equipment on the consolidated statements of operations. Lease payments do not include non-lease components such as real estate taxes, insurance and common area maintenance. ​ Below is a summary of undiscounted future minimum lease payments as of December 31, 2020: ​ ​ ​ ​ Years ending December 31, Amount 2021 $ 5,276 2022 4,896 2023 4,529 2024 4,136 2025 3,539 Thereafter 12,294 Total lease payments ​ 34,670 Less: Imputed interest ​ (8,678) Present value of operating lease liabilities $ 25,992 ​

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2020
Premises and Equipment
Premises and Equipment	Note 9 Premises and Equipment ​ Premises and equipment consisted of the following at December 31, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 December 31, 2019 Land ​ $ 33,149 ​ $ 32,911 Buildings and improvements ​ 92,463 ​ 94,260 Equipment ​ 60,205 ​ 56,523 Total premises and equipment, at cost ​ 185,817 ​ 183,694 Less: accumulated depreciation and amortization ​ (78,835) ​ (71,543) Premises and equipment, net ​ $ 106,982 ​ $ 112,151 ​ The Company recorded $8.1 million, $8.2 million and $8.6 million of depreciation expense during 2020, 2019 and 2018, respectively, as a component of occupancy and equipment expense in the consolidated statements of operations. The Company disposed of $3.6 million, $0.0 million and $1.7 million of premises and equipment, net, during 2020, 2019 and 2018, respectively. During 2020, the Company recognized $1.6 million of impairments included in non-interest expense in its consolidated statements of operations from the consolidation of 12 banking centers classified as held-for-sale totaling $8.0 million. During 2019, the Company recognized $0.9 million of impairments in its consolidated statements of operations from the consolidation of four banking centers classified as held-for-sale totaling $3.4 million.

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2020
Other Real Estate Owned
Other Real Estate Owned	Note 10 Other Real Estate Owned ​ A summary of the activity in OREO during 2020 and 2019 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ 2020 ​ 2019 Beginning balance $ 7,300 $ 10,596 Transfers from loan portfolio, at fair value 1,533 ​ 2,705 Impairments (470) ​ (1,082) Sales (3,633) ​ (4,919) Ending balance $ 4,730 ​ $ 7,300 ​ During 2020, the Company sold OREO properties with net book balances of $3.6 million, compared to $4.9 million during 2019. Sales of OREO properties resulted in net OREO gains of $38 thousand and $7.2 million which were included within other non-interest expense in the consolidated statements of operations for the years ended December 31, 2020 and 2019, respectively.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets
Goodwill and Intangible Assets	Note 11 Goodwill and Intangible Assets ​ Goodwill and core deposit intangible ​ In connection with our acquisitions, the Company recorded goodwill of $115.0 million. Goodwill is measured as the excess of the fair value of consideration paid over the fair value of net assets acquired. No goodwill impairment was recorded during the years ended December 31, 2020 or December 31, 2019. ​ The gross carrying amount of the core deposit intangibles and the associated accumulated amortization at December 31, 2020 and December 31, 2019, are presented as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ December 31, 2019 ​ Gross ​ ​ ​ ​ Net ​ Gross ​ ​ ​ ​ Net ​ carrying ​ Accumulated ​ carrying ​ carrying ​ Accumulated ​ carrying ​ amount ​ amortization ​ amount ​ amount ​ amortization ​ amount Core deposit intangible $ 48,834 $ (41,286) ​ $ 7,548 ​ $ 48,834 $ (40,103) ​ $ 8,731 ​ The Company is amortizing the core deposit intangibles from acquisitions on a straight line basis over 7 ​ The following table shows the estimated future amortization expense for the core deposit intangibles as of December 31, 2020: ​ ​ ​ ​ Years ending December 31, ​ Amount 2021 $ 1,183 2022 ​ 1,127 2023 ​ 1,048 2024 ​ 1,048 2025 ​ 1,048 ​ Mortgage servicing rights ​ MSRs represent rights to service loans originated by the Company and sold to government-sponsored enterprises including FHLMC, FNMA, GNMA and FHLB and are included in other assets in the consolidated statements of financial condition. Mortgage loans serviced for others were $1.4 billion at December 31, 2020 and $308.4 million at December 31, 2019. ​ Below are the changes in the MSRs for the years presented: ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ 2020 ​ 2019 Beginning balance $ 2,630 $ 3,556 Originations ​ 10,354 ​ ​ 27 Impairment ​ (751) ​ ​ (129) Amortization (1,853) ​ (824) Ending balance ​ 10,380 ​ ​ 2,630 Fair value of mortgage servicing rights $ 11,542 ​ $ 2,630 ​ The fair value of MSRs was determined based upon a discounted cash flow analysis. The cash flow analysis included assumptions for discount rates and prepayment speeds. Discount rates ranged from 9.5% to 10.5%, and the constant prepayment speed ranged from 15.4% to 21.3% for the December 31, 2020 valuation. Discount rates ranged from 9.5% to 10.5%, and the constant prepayment speed ranged from 14.8% to 22.0% for the December 31, 2019 valuation. Included in mortgage banking income in the consolidated statements of operations were service fees of $1.7 million and $1.0 million for the years ended December 31, 2020 and 2019, respectively. ​ MSRs are evaluated and impairment is recognized to the extent fair value is less than the carrying amount. The Company evaluates impairment by stratifying MSRs based on the predominant risk characteristics of the underlying loans, including loan type and loan term. The Company is amortizing the MSRs in proportion to and over the period of the estimated net servicing income of the underlying loans. ​ The following table shows the estimated future amortization expense for the MSRs as of December 31, 2020: ​ ​ ​ ​ Years ending December 31, ​ Amount 2021 $ 1,971 2022 ​ 1,626 2023 ​ 1,342 2024 ​ 1,108 2025 ​ 914 ​

Deposits

Deposits	12 Months Ended
	Dec. 31, 2020
Deposits
Deposits	Note 12 Deposits ​ Total deposits were $5.7 billion and $4.7 billion at December 31, 2020 and 2019, respectively. Time deposits were $1.0 billion and $1.1 billion at December 31, 2020 and 2019, respectively. The following table summarizes the Company’s time deposits by remaining contractual maturity: ​ ​ ​ ​ Years ending December 31, Amount 2021 $ 659,509 2022 ​ 246,835 2023 ​ 47,150 2024 ​ 21,717 2025 9,940 Thereafter 981 Total time deposits $ 986,132 ​ The Company incurred interest expense on deposits as follows during the years indicated: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ 2020 2019 2018 Interest bearing demand deposits ​ $ 1,921 ​ $ 1,514 ​ $ 887 Money market accounts ​ 5,342 ​ 9,046 ​ 5,622 Savings accounts ​ 1,342 ​ 2,717 ​ 2,249 Time deposits ​ 15,024 ​ 16,526 ​ 12,283 Total ​ $ 23,629 ​ $ 29,803 ​ $ 21,041 ​ The Federal Reserve System requires cash balances to be maintained at the FRB based on certain deposit levels. There was no minimum reserve requirement for the Bank at December 31, 2020.

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2020
Borrowings
Borrowings	Note 13 Borrowings ​ The following table sets forth selected information regarding repurchase agreements during 2020, 2019 and 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of and for the years ended December 31, ​ 2020 2019 2018 Maximum amount of outstanding agreements at any month end during the period $ 54,489 ​ $ 68,600 ​ $ 142,292 Average amount outstanding during the period ​ 30,355 ​ ​ 60,445 ​ ​ 87,691 Weighted average interest rate for the period 0.45% ​ 1.11% ​ 0.34% ​ The Company enters into repurchase agreements to facilitate the needs of its clients. As of December 31, 2020, 2019 and 2018, the Company sold securities under agreements to repurchase totaling $22.9 million, $56.9 million and $66.0 million, respectively. The Company pledged mortgage-backed securities with a fair value of approximately $27.7 million, $65.6 million and $73.9 million, as of December 31, 2020, 2019 and 2018, respectively, for these agreements. The Company monitors collateral levels on a continuous basis and may be required to provide additional collateral based on the fair value of the underlying securities. As of December 31, 2020, 2019 and 2018, the Company had ​ The vast majority of the Company’s repurchase agreements are overnight transactions with clients that mature the day after the transaction. At December 31, 2020, 2019 and 2018, none of the Company’s repurchase agreements were for periods longer than one day. The repurchase agreements are subject to a master netting arrangement; however, the Company has not offset any of the amounts shown in the consolidated financial statements. ​ As a member of the FHLB, the Bank has access to a line of credit and term financing from the FHLB with total available credit of $0.9 billion at December 31, 2020. At December 31, 2020, the Bank had no outstanding borrowings from the FHLB. At December 31, 2019 and 2018, the Bank had $192.7 million and $234.3 million, respectively, in line of credit advances from the FHLB that matured within a day. At December 31, 2019 and 2018, the Bank had $15.0 million and $67.3 million in term advances from the FHLB, respectively, with fixed interest rates between 1.55% - 2.33% and maturity dates of 2020 - 2021 . ​ The Bank may have investment securities and loans pledged as collateral for FHLB advances. There were no investment securities pledged at December 31, 2020. At December 31, 2019 and 2018, investment securities pledged were $17.6 million and $16.0 million, respectively. Loans pledged were $1.2 billion, $1.5 billion and $1.6 billion at December 31, 2020, 2019 and 2018, respectively. Interest expense related to FHLB advances and other short-term borrowings totaled $1.3 million, $6.3 million and $2.6 million for the years ended December 31, 2020, 2019 and 2018, respectively.

Regulatory Capital

Regulatory Capital	12 Months Ended
	Dec. 31, 2020
Regulatory Capital
Regulatory Capital	Note 14 Regulatory Capital ​ As a bank holding company, the Company is subject to regulatory capital adequacy requirements implemented by the Federal Reserve. The federal banking agencies have risk-based capital adequacy regulations intended to provide a measure of capital adequacy that reflects the degree of risk associated with a banking organization’s operations. Under these regulations, assets are assigned to one of several risk categories, and nominal dollar amounts of assets and credit equivalent amounts of off-balance-sheet items are multiplied by a risk-adjustment percentage for the category. ​ Under the Basel III requirements, at December 31, 2020 and 2019, the Company and the Bank met all capital requirements including the capital conservation buffer of 2.5%. The Bank had regulatory capital ratios in excess of the levels established for well-capitalized institutions, as detailed in the tables below. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ ​ ​ Required to be ​ Required to be ​ ​ ​ ​ ​ ​ ​ well capitalized under ​ considered ​ ​ ​ ​ ​ ​ ​ prompt corrective ​ adequately ​ ​ Actual ​ action provisions ​ capitalized ​ Ratio Amount Ratio Amount Ratio Amount Tier 1 leverage ratio: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated 10.7% ​ $ 696,311 N/A ​ ​ N/A 4.0% ​ $ 260,370 NBH Bank 9.2% ​ 600,622 5.0% ​ $ 325,447 4.0% ​ 260,358 Common equity tier 1 risk based capital: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 14.7% ​ $ 696,311 ​ N/A ​ ​ N/A ​ 7.0% ​ $ 331,632 NBH Bank ​ 12.7% ​ ​ 600,622 ​ 6.5% ​ $ 307,631 ​ 7.0% ​ ​ 331,295 Tier 1 risk based capital ratio: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated 14.7% ​ $ 696,311 N/A ​ ​ N/A 8.5% ​ $ 402,696 NBH Bank 12.7% ​ 600,622 8.0% ​ $ 378,623 8.5% ​ 402,287 Total risk based capital ratio: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated 15.8% ​ $ 749,899 N/A ​ ​ N/A 10.5% ​ $ 497,448 NBH Bank 13.8% ​ 654,209 10.0% ​ $ 473,279 10.5% ​ 496,943 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ ​ ​ ​ Required to be ​ Required to be ​ ​ ​ ​ ​ ​ ​ well capitalized under ​ considered ​ ​ ​ ​ ​ ​ ​ prompt corrective ​ adequately ​ ​ Actual ​ action provisions ​ capitalized ​ Ratio Amount Ratio Amount Ratio Amount Tier 1 leverage ratio: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated 11.0% ​ $ 640,440 N/A ​ ​ N/A 4.0% ​ $ 231,950 NBH Bank 9.1% ​ 528,028 5.0% ​ $ 289,926 4.0% ​ 231,940 Common equity tier 1 risk based capital: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 13.2% ​ $ 640,440 ​ N/A ​ ​ N/A ​ 7.0% ​ $ 405,912 NBH Bank ​ 10.9% ​ ​ 528,028 ​ 6.5% ​ $ 376,903 ​ 7.0% ​ ​ 405,896 Tier 1 risk based capital ratio: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated 13.2% ​ $ 640,440 N/A ​ ​ N/A 8.5% ​ $ 412,620 NBH Bank 10.9% ​ 528,028 8.0% ​ $ 387,701 8.5% ​ 411,932 Total risk based capital ratio: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated 14.1% ​ $ 682,645 N/A ​ ​ N/A 10.5% ​ $ 509,707 NBH Bank 11.8% ​ 570,233 10.0% ​ $ 484,626 10.5% ​ 508,857 ​ ​

Revenue from Contracts with Cli

Revenue from Contracts with Clients	12 Months Ended
	Dec. 31, 2020
Revenue from Contracts with Clients
Revenue from Contracts with Clients	Note 15 Revenue from Contracts with Clients ​ Revenue is recognized when obligations under the terms of a contract with clients are satisfied. Below is the detail of the Company’s revenue from contracts with clients. ​ Service charges and other fees ​ Service charge fees are primarily comprised of monthly service fees, check orders, and other deposit account related fees. Other fees include revenue from processing at a point in time. Payment for service charges on deposit accounts is primarily received immediately or in the following month through a direct charge to clients’ accounts. ​ Bank card fees ​ Bank card fees are primarily comprised of debit card income, ATM fees, merchant services income, and other fees. Debit card income is primarily comprised of interchange fees earned whenever the Company’s debit cards are processed through card payment networks such as Visa. ATM fees are primarily generated when a Bank cardholder uses a non-Bank ATM or a non-Bank cardholder uses a Bank ATM. Merchant services income mainly represents fees charged to merchants to process their debit card transactions. The Company’s performance obligation for bank card fees are largely satisfied, and related revenue recognized, when the services are rendered or upon completion. Payment is typically received immediately or in the following month. ​ Gain on OREO sales, net ​ Gain on OREO sales, net is recognized when the Company meets its performance obligation to transfer title to the buyer. The gain or loss is measured as the excess of the proceeds received compared to the OREO carrying value. Sales proceeds are received in cash at the time of transfer. ​ The following table presents non-interest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, and non-interest expense in-scope of Topic 606 for the years ended December 31, 2020, 2019 and 2018. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ ​ 2020 2019 2018 Non-interest income ​ ​ ​ ​ ​ ​ ​ ​ ​ In-scope of Topic 606: ​ ​ ​ ​ ​ ​ ​ ​ ​ Service charges and other fees ​ $ 16,913 ​ $ 19,720 ​ $ 20,408 Bank card fees ​ ​ 15,446 ​ ​ 14,595 ​ ​ 14,489 Non-interest income (in-scope of Topic 606) ​ ​ 32,359 ​ ​ 34,315 ​ ​ 34,897 Non-interest income (out-of-scope of Topic 606) ​ ​ 107,899 ​ ​ 48,437 ​ ​ 35,878 Total non-interest income ​ $ 140,258 ​ $ 82,752 ​ $ 70,775 Non-interest expense ​ ​ ​ ​ ​ ​ ​ ​ ​ In-scope of Topic 606: ​ ​ ​ ​ ​ ​ ​ ​ ​ Gain on OREO sales, net ​ $ 38 ​ $ 7,193 ​ 488 Total revenue in-scope of Topic 606 ​ $ 32,397 ​ $ 41,508 ​ $ 35,385 ​ Contract acquisition costs ​ In accordance with Topic 606, an entity is required to capitalize, and subsequently amortize into expense, certain incremental costs of obtaining a contract with a client if these costs are expected to be recovered. The incremental costs of obtaining a contract are those costs that an entity incurs to obtain a contract with a client that it would not have incurred if the contract had not been obtained (for example, sales commission). The Company utilizes the practical expedient which allows entities to expense immediately contract acquisition costs when the asset that would have resulted from capitalizing these costs would have been amortized in one year or less. The Company has not capitalized any contract acquisition costs.

Stock-based Compensation and Be

Stock-based Compensation and Benefits	12 Months Ended
	Dec. 31, 2020
Stock-based Compensation and Benefits
Stock-based Compensation and Benefits	Note 16 Stock-based Compensation and Benefits ​ The Company provides stock-based compensation in accordance with shareholder-approved plans. In 2014, shareholders approved the 2014 Omnibus Incentive Plan (the "2014 Plan"). The 2014 Plan replaces the NBH Holdings Corp. 2009 Equity Incentive Plan (the "Prior Plan"), pursuant to which the Company granted equity awards prior to the approval of the 2014 Plan. Pursuant to the 2014 Plan, the Compensation Committee of the Board of Directors has the authority to grant, from time to time, awards of stock options, stock appreciation rights, restricted stock, restricted stock units, performance units, other stock-based awards, or any combination thereof to eligible persons. ​ As of December 31, 2020, the aggregate number of Class A common stock available for issuance under the 2014 Plan is 4,314,726 shares. Any shares that are subject to stock options or stock appreciation rights under the 2014 Plan will be counted against the amount available for issuance as one share for every one share granted, and any shares that are subject to awards under the 2014 Plan other than stock options or stock appreciation rights will be counted against the amount available for issuance as 3.25 shares for every one share granted. The 2014 Plan provides for recycling of shares from both the Prior Plan and the 2014 Plan, the terms of which are further described in the Company's Proxy Statement for its 2014 Annual Meeting of Shareholders. Upon an option exercise, it is the Company’s policy to issue shares from treasury stock. ​ To date, the Company has issued stock options, restricted stock and performance stock units under the plans. The Compensation Committee sets the option exercise price at the time of grant, but in no case is the exercise price less than the fair market value of a share of stock at the date of grant. ​ Stock options ​ The Company issues stock options, which are primarily time-vesting with 1/3 1 ​ Below are the weighted average assumptions used in the Black-Scholes option pricing model to determine fair value of the Company’s stock options granted in 2020, 2019 and 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2020 2019 2018 Weighted average fair value $ 3.37 ​ $ 6.31 ​ $ 7.43 Weighted average risk-free interest rate (1) ​ 0.44% ​ ​ 2.35% ​ ​ 2.69% Expected volatility (2) 25.08% ​ ​ 20.56% ​ ​ 20.75% Expected term (years) (3) 6.04 ​ ​ 6.05 ​ ​ 6.10 Dividend yield (4) 3.44% ​ ​ 2.00% ​ ​ 1.13% (1) The risk-free rate for the expected term of the options was based on the U.S. Treasury yield curve at the date of grant and based on the expected term. (2) Expected volatility was calculated using historical volatility of the Company’s stock price for a period commensurate with the expected term of the options. For periods prior to the third quarter of 2018, expected volatility was calculated using a historical volatility of the Company’s stock price coupled with those of a peer group of eight comparable publicly traded companies for a period commensurate with the expected term of the options. (3) The expected term was estimated to be the average of the contractual vesting term and time to expiration. (4) The dividend yield was calculated in accordance with the Company’s dividend policy at the time of grant. ​ The Company issued stock options in accordance with the 2014 Plan during 2020. The following table summarizes stock option activity for 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ ​ ​ ​ ​ average ​ ​ ​ ​ ​ ​ ​ Weighted ​ remaining ​ ​ ​ ​ ​ ​ ​ average ​ contractual ​ Aggregate ​ ​ ​ ​ exercise ​ term in ​ intrinsic ​ ​ Options ​ price ​ years ​ value Outstanding at December 31, 2019 657,114 ​ $ 26.69 6.41 ​ $ 5,626 Granted 230,261 ​ 23.25 ​ ​ ​ ​ ​ Exercised ​ (94,007) ​ ​ 19.95 ​ ​ ​ ​ ​ Forfeited (25,239) ​ 30.59 ​ ​ ​ ​ ​ Outstanding at December 31, 2020 768,129 ​ $ 26.35 6.91 ​ ​ 5,224 Options exercisable at December 31, 2020 412,940 ​ ​ 25.64 5.32 ​ ​ 3,101 Options vested and expected to vest 736,774 ​ ​ 26.36 6.82 ​ ​ 5,005 ​ Stock option expense is a component of salaries and benefits in the consolidated statements of operations and totaled $1.0 million, $0.7 million and $0.8 million for 2020, 2019 and 2018, respectively. At December 31, 2020, there was $0.7 million of total unrecognized compensation cost related to non-vested stock options granted under the plans. The cost is expected to be recognized over a weighted average period of 1.2 years. ​ The following table summarizes the Company’s outstanding stock options: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Options outstanding ​ Options exercisable ​ ​ ​ ​ ​ Weighted average ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Number ​ remaining contractual ​ Weighted average ​ Number ​ Weighted average Range of exercise price ​ outstanding ​ life (years) ​ exercise price ​ exercisable ​ exercise price $ 18.00 - 22.99 228,228 3.95 ​ $ 19.25 228,228 ​ $ 19.25 ​ 23.00 - 27.99 219,652 9.24 ​ ​ 23.13 936 ​ ​ 23.75 ​ 28.00 - 32.99 ​ 110,753 ​ 7.18 ​ ​ 32.53 ​ 71,223 ​ ​ 32.64 ​ 33.00 - 37.99 ​ 207,597 ​ 7.54 ​ ​ 34.15 ​ 111,289 ​ ​ 34.12 ​ 38.00 and above 1,899 7.63 ​ ​ 40.36 1,264 ​ ​ 40.36 ​ Restricted stock awards ​ The Company issues primarily time-based restricted stock awards that vest over a range of a 1 ​ Performance stock units ​ During the years ended December 2020, 2019 and 2018, the Company granted 68,498, 60,781 , and 77,125 performance stock units in accordance with the 2014 Plan, respectively. The Company grants performance stock units which represent initial target awards and do not reflect potential increases or decreases resulting from the final performance results, which are to be determined at the end of the three-year performance period (vesting date). The actual number of shares to be awarded at the end of the performance period will range from 0% - 150% of the initial target awards. Historically, 60% of the award is based on the Company’s cumulative earnings per share (EPS target) during the performance period, and 40% of the award is based on the Company’s cumulative total shareholder return (TSR target), or TSR, during the performance period. On the vesting date, the Company’s TSR will be compared to the respective TSRs of the companies comprising the KBW Regional Index at the grant date to determine the shares awarded. The fair value of the EPS target portion of the award was determined based on the closing stock price of the Company’s common stock on the grant date. The fair value of the TSR target portion of the award was determined using a Monte Carlo Simulation at the grant date. ​ In establishing the PSU components during 2020, the Compensation Committee determined the EPS target portion of the award would not be an effective metric in light of economic uncertainty surrounding COVID-19. Consequently, the Compensation Committee granted an award based upon a relative return on tangible assets (“ROTA”). Annually, the Company’s ROTA is compared to the respective ROTA of companies comprising the KBW Regional Index. At the end of the measurement period, the Company’s ranking will be averaged to determine the shares awarded. The fair value of the ROTA award was determined based on the closing stock price of the Company’s common stock on the grant date. ​ The weighted-average grant date fair value per unit for the ROTA target portion and the TSR target portion granted during 2020 was $28.43 and $24.58, respectively. The weighted-average grant date fair value per unit for awards granted during 2019 of the EPS target portion and the TSR target portion was $34.08 and $27.01, respectively. The initial weighted-average performance price for the TSR target portion granted during 2020 was $35.95. During 2020 and 2019, the Company awarded an additional 17,852 and 22,246 units due to final performance results related to performance stock units granted in 2017 and 2016, respectively. ​ The following table summarizes restricted stock and performance stock unit activity during 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Weighted ​ ​ Restricted ​ average grant- ​ Performance ​ ​ average grant- ​ ​ stock shares ​ date fair value ​ stock units ​ ​ date fair value Unvested at December 31, 2018 ​ 146,494 ​ $ 28.19 ​ 192,049 ​ $ 26.40 Granted ​ 86,689 ​ ​ 35.05 ​ 60,781 ​ ​ 30.85 Adjustment due to performance ​ — ​ ​ — ​ 22,246 ​ ​ 17.36 Vested ​ (85,266) ​ ​ 25.21 ​ (95,308) ​ ​ 18.02 Forfeited ​ (25,719) ​ ​ 32.68 ​ (20,894) ​ ​ 31.48 Unvested at December 31, 2019 ​ 122,198 ​ ​ 34.19 ​ 158,874 ​ ​ 31.19 Granted ​ 127,400 ​ ​ 23.94 ​ 68,498 ​ ​ 26.74 Adjustment due to performance ​ — ​ ​ — ​ 17,852 ​ ​ 33.22 Vested ​ (69,444) ​ ​ 32.60 ​ (53,540) ​ ​ 33.22 Forfeited ​ (13,524) ​ ​ 29.25 ​ (6,847) ​ ​ 29.52 Unvested at December 31, 2020 ​ 166,630 ​ $ 27.42 ​ 184,837 ​ $ 29.21 ​ As of December 31, 2020, the total unrecognized compensation cost related to the non-vested restricted stock awards and performance stock units totaled $2.1 million and $2.5 million, respectively, and is expected to be recognized over a weighted average period of approximately 2.0 years and 1.7 years, respectively. Expense related to non-vested restricted stock awards totaled $2.5 million, $2.2 million and $2.1 million during 2020, 2019 and 2018, respectively. Expense related to non-vested performance stock units totaled $1.8 million, $2.0 million and $1.5 million during 2020, 2019 and 2018, respectively. Expense related to non-vested restricted stock awards and units is a component of salaries and benefits in the Company’s consolidated statements of operations. ​ Employee stock purchase plan ​ The 2014 Employee Stock Purchase Plan (“ESPP”) is intended to be a qualified plan within the meaning of Section 423 of the Internal Revenue Code of 1986 and allows eligible employees to purchase shares of common stock through payroll deductions up to a limit of $25,000 per calendar year and 2,000 shares per offering period. The price an employee pays for shares is 90.0% of the fair market value of Company common stock on the last day of the offering period. The offering periods are the six-month periods commencing on March 1 and September 1 of each year and ending on August 31 and February 28 (or February 29 in the case of a leap year) of each year. There are no vesting or other restrictions on the stock purchased by employees under the ESPP. Under the ESPP, the total number of shares of common stock reserved for issuance totaled 400,000 shares, of which 302,876 was available for issuance at December 31, 2020. ​ Under the ESPP, employees purchased 23,212 shares and 16,556 shares during 2020 and 2019, respectively.

Common Stock

Common Stock	12 Months Ended
	Dec. 31, 2020
Common Stock
Common Stock	Note 17 Common Stock ​ The Company had 30,634,291 and 31,176,627 shares of Class A common stock outstanding at December 31, 2020 and 2019, respectively. Additionally, the Company had 166,630 and 122,198 shares outstanding at December 31, 2020 and 2019, respectively, of restricted Class A common stock issued but not yet vested under the 2014 Omnibus Incentive Plan that are not included in shares outstanding until such time that they are vested; however, these shares do have voting and certain dividend rights during the vesting period. ​ On February 26, 2020, the Board of Directors authorized a new share repurchase program for up to $50.0 million from time to time in either the open market or through privately negotiated transactions. During the first quarter of 2020, the Company repurchased 734,117 shares for $19.5 million. Of those repurchases, $12.6 million were part of the previous authorization from August 2016. That authorization has been completed. The remaining authorization under the new program as of December 31, 2020 was $43.1 million.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2020
Earnings Per Share
Earnings Per Share	Note 18 Earnings Per Share ​ The Company calculates earnings per share under the two-class method, as certain non-vested share awards contain non-forfeitable rights to dividends. As such, these awards are considered securities that participate in the earnings of the Company. Non-vested shares are discussed further in note 16. ​ The Company had 30,634,291 and 31,176,627 shares of Class A common stock outstanding as of December 31, 2020 and 2019, respectively, exclusive of issued non-vested restricted shares. Certain stock options and non-vested restricted shares are potentially dilutive securities, but are not included in the calculation of diluted earnings per share because to do so would have been anti-dilutive for 2020, 2019 and 2018. ​ The following table illustrates the computation of basic and diluted earnings per share for 2020, 2019 and 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ 2020 2019 2018 Net income ​ $ 88,591 ​ $ 80,365 ​ $ 61,451 Less: income allocated to participating securities ​ (130) ​ (94) ​ (70) Income allocated to common shareholders ​ $ 88,461 ​ $ 80,271 ​ $ 61,381 Weighted average shares outstanding for basic earnings per common share ​ 30,857,086 ​ 31,175,825 ​ 30,748,234 Dilutive effect of equity awards ​ 218,771 ​ 354,992 ​ 681,840 Weighted average shares outstanding for diluted earnings per common share ​ 31,075,857 ​ 31,530,817 ​ 31,430,074 Basic earnings per share ​ $ 2.87 ​ $ 2.57 ​ $ 2.00 Diluted earnings per share ​ ​ 2.85 ​ ​ 2.55 ​ ​ 1.95 ​ The Company had 768,129, 657,114 and 1,264,876 outstanding stock options to purchase common stock at weighted average exercise prices of $26.35, $26.69 and $22.33 per share at December 31, 2020, 2019 and 2018, respectively, which have time-vesting criteria, and as such, any dilution is derived only for the time frame in which the vesting criteria had been met and where the inclusion of those stock options is dilutive. The Company had 351,467, 281,072 and 338,543 unvested restricted shares and performance stock units issued as of December 31, 2020, 2019 and 2018, respectively, which have performance, market and/or time-vesting criteria, and as such, any dilution is derived only for the time frame in which the vesting criteria had been met and where the inclusion of those restricted shares and units is dilutive.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2020
Income Taxes
Income Taxes	Note 19 Income Taxes ​ Income tax expense attributable to income before taxes was $20.8 million, $15.8 million and $12.2 million for 2020, 2019 and 2018, respectively. Included in income tax was $51 thousand of tax expense during 2020 and $2.2 million and $1.3 million of tax benefit from stock compensation activity during 2019 and 2018, respectively. ​ (a) Income taxes ​ Total income taxes for 2020, 2019 and 2018 were allocated as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ 2020 2019 2018 Current expense: ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. federal ​ $ 16,460 ​ $ 8,947 ​ $ 427 State and local ​ 3,255 ​ 2,280 ​ 1,530 Total current income tax expense ​ ​ 19,715 ​ ​ 11,227 ​ ​ 1,957 Deferred expense: ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. federal ​ ​ 560 ​ ​ 4,115 ​ ​ 10,110 State and local ​ 531 ​ 487 ​ 163 Total deferred income tax expense ​ 1,091 ​ 4,602 ​ 10,273 Income tax expense ​ $ 20,806 ​ $ 15,829 ​ $ 12,230 ​ (b) Tax Rate Reconciliation ​ The reconciliation between the income tax expenses and the amounts computed by applying the U.S. federal income tax rate to pretax income is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ 2020 2019 2018 Income tax at federal statutory rates (21%) ​ $ 22,974 ​ $ 20,201 ​ $ 15,473 State income taxes, net of federal benefits ​ 2,991 ​ 2,186 ​ 1,337 Tax-exempt loan interest income ​ (4,628) ​ (4,354) ​ (4,089) Bank-owned life insurance income ​ (575) ​ (475) ​ 136 Stock-based compensation ​ 43 ​ (1,925) ​ (1,207) Other ​ 1 ​ 196 ​ 580 Income tax expense ​ $ 20,806 ​ $ 15,829 ​ $ 12,230 ​ (c) Significant Components of Deferred Taxes ​ The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2020 and 2019 are presented below: ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 December 31, 2019 Deferred tax assets: ​ ​ ​ ​ ​ Excess tax basis of acquired loans over carrying value $ 966 ​ $ 2,053 Allowance for credit losses 14,154 ​ 9,414 Other real estate owned 634 ​ 810 Accrued stock-based compensation 2,070 ​ 1,945 Accrued compensation 3,674 ​ 3,425 Capitalized start-up costs 1,540 ​ 1,885 Accrued expenses 532 ​ 1,051 Net deferred loan fees 1,015 ​ 63 Net operating loss ​ 641 ​ ​ 707 Lease liability ​ 6,154 ​ ​ 7,113 Other 2,025 ​ 1,910 Total deferred tax assets ​ 33,405 ​ ​ 30,376 Deferred tax liabilities: ​ ​ ​ ​ ​ Intangible assets ​ (2,563) ​ ​ (327) Net unrealized gains on investment securities (3,033) ​ (647) Premises and equipment (1,599) ​ (1,852) Right of use assets ​ (6,015) ​ ​ (7,033) Prepaid expenses ​ (229) ​ ​ (209) Mortgage servicing rights ​ (2,458) ​ ​ (634) Other (44) ​ (196) Total deferred tax liabilities (15,941) ​ (10,898) Net deferred tax asset $ 17,464 ​ $ 19,478 ​ At December 31, 2020, the Company had federal and state net operating loss carryovers (NOLs) of $2.4 million and $3.5 million, respectively, which are available to offset future taxable income. The federal NOLs expire in varying amounts through 2034, and the state NOLs expire in varying amounts between 2026 and 2034. While these NOLs are subject to certain restrictions on the amount that can be utilized per year, the Company does not expect any tax attribute carryovers to expire before they are utilized. ​ In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, if any (including the impact of available carryforward periods), projected future taxable income, and tax-planning strategies in making this assessment. For the years ended December 31, 2020 and 2019, management believes a valuation allowance on the deferred tax asset is not necessary based on the current and future projected earnings of the Company. The Company has no ASC 740-10 unrecognized tax benefits recorded as of December 31, 2020 and 2019 and does not expect the total amount of unrecognized tax benefits to significantly increase within the next 12 months. The Company and its subsidiary bank are subject to income tax by federal, state and local government taxing authorities. The Company is not currently subject to any open income tax examinations; however, the Company’s tax returns for the years ended December 31, 2017 through 2020 remain subject to examination by U.S. federal income tax authorities. The years open to examination by state and local government authorities vary by jurisdiction.

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2020
Derivatives
Derivatives	Note 20 Derivatives ​ Risk management objective of using derivatives ​ The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company has established policies that neither carrying value nor fair value at risk should exceed established guidelines. The Company has designed strategies to confine these risks within the established limits and identify appropriate trade-offs in the financial structure of its balance sheet. These strategies include the use of derivative financial instruments to help achieve the desired balance sheet repricing structure while meeting the desired objectives of its clients. Currently the Company employs certain interest rate swaps that are designated as fair value hedges as well as economic hedges. The Company manages a matched book with respect to its derivative instruments in order to minimize its net risk exposure resulting from such transactions. ​ Fair values of derivative instruments on the balance sheet ​ The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the consolidated statements of financial condition as of December 31, 2020 and 2019. ​ Information about the valuation methods used to measure fair value is provided in note 22. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset derivatives fair value ​ ​ ​ Liability derivatives fair value ​ ​ Balance Sheet ​ December 31, ​ December 31, ​ Balance Sheet ​ December 31, ​ December 31, ​ location 2020 2019 Location 2020 2019 Derivatives designated as hedging instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate products Other assets ​ $ — ​ $ 1,171 Other liabilities ​ $ 38,884 ​ $ 13,537 Total derivatives designated as hedging instruments ​ ​ ​ $ — ​ $ 1,171 ​ ​ ​ $ 38,884 ​ $ 13,537 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives not designated as hedging instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate products Other assets ​ $ 18,149 ​ $ 9,004 Other liabilities ​ $ 18,176 ​ $ 9,021 Interest rate lock commitments ​ Other assets ​ ​ 7,001 ​ ​ 1,499 ​ Other liabilities ​ ​ 298 ​ ​ 141 Forward contracts ​ Other assets ​ ​ — ​ ​ 16 ​ Other liabilities ​ ​ 2,622 ​ ​ 299 Total derivatives not designated as hedging instruments ​ ​ ​ $ 25,150 ​ $ 10,519 ​ ​ ​ $ 21,096 ​ $ 9,461 ​ Fair value hedges ​ Interest rate swaps designated as fair value hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without the exchange of the underlying notional amount. As of December 31, 2020, the Company had interest rate swaps with a notional amount of $387.1 million that were designated as fair value hedges. These interest rate swaps were associated with $389.9 million of the Company’s fixed-rate loans included in loans receivable on the statements of financial condition as of December 31, 2020, before a gain of $40.1 million from the fair value hedge adjustment in the carrying amount. ​ As of December 31, 2019, the Company had interest rate swaps with a notional amount of $403.7 million that were designated as fair value hedges. These interest rate swaps were associated with $405.9 million of the Company’s fixed-rate loans as of December 31, 2019, excluding a gain of $13.9 million from the fair value hedge adjustment in the carrying amount. ​ For derivatives designated and that qualify as fair value hedges, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in earnings. The Company includes the gain or loss on the hedged items in the same line item as the offsetting loss or gain on the related derivatives. ​ Non-designated hedges ​ Derivatives not designated as hedges are not speculative and consist of interest rate swaps with commercial banking clients that facilitate their respective risk management strategies. Interest rate swaps are simultaneously hedged by offsetting interest rate swaps that the Company executes with a third party, such that the Company minimizes its net risk exposure resulting from such transactions. As the interest rate swaps associated with this program do not meet the strict hedge accounting requirements, changes in the fair value of both the client swaps and the offsetting swaps are recognized directly in earnings. As of December 31, 2020, the Company had matched interest rate swap transactions with an aggregate notional amount of $456.0 million related to this program. As of December 31, 2019, the Company had matched interest rate swap transactions with an aggregate notional amount of $478.9 million. ​ As part of its mortgage banking activities, the Company enters into interest rate lock commitments, which are commitments to originate loans where the interest rate on the loan is determined prior to funding and the clients have locked into that interest rate. The Company then locks in the loan and interest rate with an investor and commits to deliver the loan if settlement occurs ("best efforts") or commits to deliver the locked loan in a binding ("mandatory") delivery program with an investor. Fair value changes of certain loans under interest rate lock commitments are hedged with forward sales contracts of MBS. Forward sales contracts of MBS are recorded at fair value with changes in fair value recorded in non-interest income. Interest rate lock commitments and commitments to deliver loans to investors are considered derivatives. The market value of interest rate lock commitments and best efforts contracts are not readily ascertainable with precision because they are not actively traded in stand-alone markets. The Company determines the fair value of interest rate lock commitments and delivery contracts by measuring the fair value of the underlying assets. The fair value of the underlying assets is impacted by current interest rates, remaining origination fees, costs of production to be incurred, and the probability that the interest rate lock commitments will close or will be funded. ​ Certain additional risks arise from these forward delivery contracts in that the counterparties to the contracts may not be able to meet the terms of the contracts. The Company does not expect any counterparty to any MBS contract to fail to meet its obligation. Additional risks inherent in mandatory delivery programs include the risk that, if the Company fails to deliver the loans subject to interest rate risk lock commitments, it will still be obligated to “pair off” MBS to the counterparty. Should this be required, the Company could incur significant costs in acquiring replacement loans and such costs could have an adverse effect on the consolidated financial statements. ​ The fair value of the mortgage banking derivative is recorded as a freestanding asset or liability with the change in value being ​ The Company had interest rate lock commitments with a notional value of $258.8 million and forward contracts with a notional value of $375.3 million at December 31, 2020. At December 31, 2019, the Company had interest rate lock commitments with a notional value of $99.8 million and forward contracts with a notional value of $181.5 million. ​ Effect of derivative instruments on the consolidated statements of operations ​ The tables below present the effect of the Company’s derivative financial instruments on the consolidated statements of operations for 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Location of gain (loss) ​ Amount of gain (loss) recognized in income on derivatives Derivatives in fair value ​ recognized in income on ​ For the years ended December 31, hedging relationships derivatives 2020 2019 Interest rate products Interest and fees on loans ​ $ 4,405 ​ $ 10,397 Total ​ ​ ​ $ 4,405 ​ $ 10,397 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Location of gain (loss) ​ Amount of gain (loss) recognized in income on hedged items ​ ​ recognized in income on ​ For the years ended December 31, Hedged items hedged items 2020 2019 Interest rate products Interest and fees on loans ​ $ (6,376) $ (9,603) Total ​ ​ ​ $ (6,376) $ (9,603) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Location of gain (loss) ​ Amount of gain (loss) recognized in income on derivatives Derivatives not designated ​ recognized in income on ​ For the years ended December 31, as hedging instruments derivatives 2020 2019 Interest rate products Other non-interest expense ​ $ (7) $ 133 Interest rate lock commitments ​ Mortgage banking income ​ ​ 7,218 ​ ​ 1,138 Forward contracts ​ Mortgage banking income ​ ​ (2,339) ​ ​ 189 Total ​ ​ ​ $ 4,872 $ 1,460 ​ Credit-risk-related contingent features ​ The Company has agreements with its derivative counterparties that contain a provision where if the Company defaults on any of its indebtedness for reasons other than an error or omission of an administrative or operational nature, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations. ​ The Company also has agreements with certain of its derivative counterparties that contain a provision where if the Company fails to maintain its status as a well/adequately capitalized institution, then the counterparty has the right to terminate the derivative positions and the Company would be required to settle its obligations under the agreements. ​ As of December 31, 2020, the termination value of derivatives in a net liability position related to these agreements was $59.0 million, which includes accrued interest but excludes any adjustment for nonperformance risk. The Company has minimum collateral posting thresholds with certain of its derivative counterparties and, as of December 31, 2020, the Company had posted $63.4 million in eligible collateral. If the Company had breached any of these provisions at December 31, 2020, it could have been required to settle its obligations under the agreements at the termination value.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies
Commitments and Contingencies	Note 21 Commitments and Contingencies ​ In the normal course of business, the Company enters into various off-balance sheet commitments to help meet the financing needs of clients. These financial instruments include commitments to extend credit, commercial and consumer lines of credit and standby letters of credit. The same credit policies are applied to these commitments as the loans on the consolidated statements of financial condition; however, these commitments involve varying degrees of credit risk in excess of the amount recognized in the consolidated statements of financial condition. The total amounts of unused commitments do not necessarily represent future credit exposure or cash requirements, as commitments often expire without being drawn upon. However, the contractual amount of these commitments, offset by any additional collateral pledged, represents the Company’s potential credit loss exposure. ​ Total unfunded commitments at December 31, 2020 and 2019 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 December 31, 2019 Commitments to fund loans ​ $ 311,237 ​ $ 249,914 Unfunded commitments under lines of credit ​ 537,325 ​ 600,407 Commercial and standby letters of credit ​ 7,320 ​ 11,929 Total unfunded commitments ​ $ 855,882 ​ $ 862,250 ​ Commitments to fund loans ​ Unfunded commitments under lines of credit ​ Commercial and standby letters of credit various forms of “back-up” commitments to guarantee the performance of a client to a third party. While these arrangements represent a potential cash outlay for the Company, the majority of these letters of credit will expire without being drawn upon. Letters of credit are subject to the same underwriting and credit approval process as traditional loans, and as such, many of them have various forms of collateral securing the commitment, which may include real estate, personal property, receivables or marketable securities. ​ Contingencies ​ Mortgage loans sold to investors may be subject to repurchase or indemnification in the event of specific default by the borrower or subsequent discovery that underwriting standards were not met. The Company established a reserve liability for expected losses related to these representations and warranties based upon management’s evaluation of actual and historic loss history, delinquency trends in the portfolio and economic conditions. Charges against the reserve during the year ended December 31, 2020 and 2019 totaling $0.5 million and $0.3 million, respectively, were primarily driven by early payoffs. The Company recorded a repurchase reserve of $2.7 million and $2.6 million at December 31, 2020 and 2019, respectively, which is included in other liabilities on the consolidated statements of financial condition. ​ The following table summarizes mortgage repurchase reserve activity for the periods presented: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ ​ 2020 ​ 2019 Beginning balance ​ $ 2,589 ​ $ 3,286 Provision charged to (released from) operating expense, net ​ ​ 662 ​ ​ (366) Charge-offs ​ ​ (510) ​ ​ (331) Ending balance ​ $ 2,741 ​ $ 2,589 ​ In the ordinary course of business, the Company and the Bank may be subject to litigation. Based upon the available information and advice from the Company’s legal counsel, management does not believe that any potential, threatened or pending litigation to which it is a party will have a material adverse effect on the Company’s liquidity, financial condition or results of operations.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2020
Fair Value Measurements
Fair Value Measurements	Note 22 Fair Value Measurements ​ The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities and to disclose the fair value of its financial instruments. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. For disclosure purposes, the Company groups its financial and non-financial assets and liabilities into three different levels based on the nature of the instrument and the availability and reliability of the information that is used to determine fair value. The three levels are defined as follows: ​ ● Level 1—Includes assets or liabilities in which the valuation methodologies are based on unadjusted quoted prices in active markets for identical assets or liabilities. ​ ● Level 2—Includes assets or liabilities in which the inputs to the valuation methodologies are based on similar assets or liabilities in inactive markets, quoted prices for identical or similar assets or liabilities in inactive markets, and inputs other than quoted prices that are observable, such as interest rates, yield curves, volatilities, prepayment speeds, and other inputs obtained from observable market input. ​ ● Level 3—Includes assets or liabilities in which the inputs to the valuation methodology are based on at least one significant assumption that is not observable in the marketplace. These valuations may rely on management’s judgment and may include internally-developed model-based valuation techniques. ​ Level 1 inputs are considered to be the most transparent and reliable and level 3 inputs are considered to be the least transparent and reliable. The Company assumes the use of the principal market to conduct a transaction of each particular asset or liability being measured and then considers the assumptions that market participants would use when pricing the asset or liability. Whenever possible, the Company first looks for quoted prices for identical assets or liabilities in active markets (level 1 inputs) to value each asset or liability. However, when inputs from identical assets or liabilities on active markets are not available, the Company utilizes market observable data for similar assets and liabilities. The Company maximizes the use of observable inputs and limits the use of unobservable inputs to occasions when observable inputs are not available. The need to use unobservable inputs generally results from the lack of market liquidity of the actual financial instrument or of the underlying collateral. While third party price indications may be available in those cases, limited trading activity can challenge the observability of those inputs. ​ Changes in the valuation inputs used for measuring the fair value of financial instruments may occur due to changes in current market conditions or other factors. Such changes may necessitate a transfer of the financial instruments to another level in the hierarchy based on the new inputs used. The Company recognizes these transfers at the end of the reporting period that the transfer occurs. During 2020 and 2019, there were no transfers of financial instruments between the hierarchy levels. ​ The following is a description of the valuation methodologies used for assets and liabilities measured at fair value, as well as the general classification of each instrument under the valuation hierarchy: ​ Fair Value of Financial Instruments Measured on a Recurring Basis ​ Investment securities available-for-sale ​ Loans held for sale ​ Interest rate swap derivatives ​ Mortgage banking derivatives on market prices for similar financial instruments), which includes matching specific terms and maturities of the forward commitments against applicable investor pricing. ​ The tables below present the financial instruments measured at fair value on a recurring basis as of December 31, 2020 and 2019, on the consolidated statements of financial condition utilizing the hierarchy structure described above: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Level 1 ​ Level 2 ​ Level 3 ​ Total Assets: ​ ​ ​ ​ Investment securities available-for-sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ — ​ $ 196,334 ​ $ — ​ $ 196,334 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ — ​ 462,779 ​ — ​ 462,779 Municipal securities ​ ​ — ​ ​ 318 ​ ​ — ​ ​ 318 Corporate debt ​ ​ — ​ 1,998 ​ — ​ 1,998 Loans held for sale ​ — ​ 247,813 ​ — ​ 247,813 Interest rate swap derivatives ​ — ​ 18,149 ​ — ​ 18,149 Mortgage banking derivatives ​ ​ — ​ ​ — ​ ​ 7,001 ​ ​ 7,001 Total assets at fair value ​ $ — ​ $ 927,391 ​ $ 7,001 ​ $ 934,392 Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap derivatives ​ $ — ​ $ 57,060 ​ $ — ​ $ 57,060 Mortgage banking derivatives ​ ​ — ​ ​ — ​ ​ 2,920 ​ ​ 2,920 Total liabilities at fair value ​ $ — ​ $ 57,060 ​ $ 2,920 ​ $ 59,980 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ Level 1 Level 2 Level 3 Total Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Investment securities available-for-sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ — ​ $ 95,256 ​ $ — ​ $ 95,256 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ — ​ 542,037 ​ — ​ 542,037 Municipal securities ​ ​ — ​ ​ 372 ​ ​ — ​ ​ 372 Loans held for sale ​ — ​ 117,444 ​ — ​ 117,444 Interest rate swap derivatives ​ — ​ 10,175 ​ — ​ 10,175 Mortgage banking derivatives ​ ​ — ​ ​ — ​ ​ 1,515 ​ ​ 1,515 Total assets at fair value ​ $ — ​ $ 765,284 ​ $ 1,515 ​ $ 766,799 Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap derivatives ​ $ — ​ $ 22,558 ​ $ — ​ $ 22,558 Mortgage banking derivatives ​ ​ — ​ ​ — ​ ​ 440 ​ ​ 440 Total liabilities at fair value ​ $ — ​ $ 22,558 ​ $ 440 ​ $ 22,998 ​ The table below details the changes in level 3 financial instruments during 2020: ​ ​ ​ ​ ​ ​ Mortgage banking ​ ​ ​ derivatives, net Balance at December 31, 2019 ​ $ 1,075 Gain included in earnings, net ​ ​ 4,879 Fees and costs included in earnings, net ​ (1,873) Balance at December 31, 2020 ​ $ 4,081 ​ Fair Value of Financial Instruments Measured on a Non-recurring Basis ​ Certain assets may be recorded at fair value on a non-recurring basis as conditions warrant. These non-recurring fair value measurements typically result from the application of lower of cost or fair value accounting or a write-down occurring during the period. ​ Individually evaluated loans ​ OREO ​ Mortgage servicing rights ​ Premises and equipment ​ The Company may be required to record fair value adjustments on other available-for-sale and municipal securities valued at par on a non-recurring basis. ​ The tables below provide information regarding the assets recorded at fair value on a non-recurring basis at December 31, 2020 and 2019. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Total ​ Losses from fair value changes Individually evaluated loans ​ $ 25,480 ​ $ 3,228 Other real estate owned ​ 4,730 ​ 470 Premises and equipment ​ 8,024 ​ ​ 1,631 Mortgage servicing rights ​ 10,380 ​ 751 Total ​ $ 48,614 ​ $ 6,080 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ Total ​ Losses from fair value changes Individually evaluated loans ​ $ 32,763 ​ $ 8,271 Other real estate owned ​ 7,300 ​ 1,082 Premises and equipment ​ 3,385 ​ ​ 898 Mortgage servicing rights ​ ​ 2,630 ​ ​ 129 Total ​ $ 46,078 ​ $ 10,380 ​ The Company did not record any liabilities measured at fair value on a non-recurring basis during 2020 and 2019.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2020
Fair Value Measurements
Fair Value of Financial Instruments	Note 23 Fair Value of Financial Instruments ​ The fair value of a financial instrument is the amount that would be exchanged between willing parties, other than in a forced liquidation. Fair value is determined based upon quoted market prices to the extent possible; however, in many instances, there are no quoted market prices for the Company’s various financial instruments. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques that may be significantly impacted by the assumptions used, including the discount rate and estimates of future cash flows. Changes in any of these assumptions could significantly affect the fair value estimates. The fair value of the financial instruments listed below does not reflect a premium or discount that could result from offering all of the Company’s holdings of financial instruments at one time, nor does it reflect the underlying value of the Company, as ASC Topic 825 excludes certain financial instruments and all non-financial instruments from its disclosure requirements. The estimated fair value amounts have been determined by the Company using available market information and appropriate valuation methodologies and are based on the exit price concept within ASC Topic 825 and applied to this disclosure on a prospective basis. Considerable judgment is required to interpret market data in order to develop the estimates of fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Company could realize in a current market exchange. ​ The fair value of financial instruments at December 31, 2020 and 2019 are set forth below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Level in fair value December 31, 2020 December 31, 2019 ​ ​ measurement ​ Carrying ​ Estimated ​ Carrying ​ Estimated ​ ​ hierarchy ​ amount fair value amount fair value ASSETS ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents Level 1 ​ $ 605,565 ​ $ 605,565 ​ $ 110,190 ​ $ 110,190 Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale Level 2 ​ 196,334 ​ 196,334 ​ 95,256 ​ 95,256 Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale Level 2 ​ 462,779 ​ 462,779 ​ 542,037 ​ 542,037 Municipal securities available-for-sale ​ Level 2 ​ ​ 318 ​ ​ 318 ​ ​ 372 ​ ​ 372 Municipal securities available-for-sale ​ Level 3 ​ ​ 57 ​ ​ 57 ​ ​ 115 ​ ​ 115 Corporate debt ​ Level 2 ​ ​ 1,998 ​ ​ 1,998 ​ ​ — ​ ​ — Other available-for-sale securities Level 3 ​ 469 ​ 469 ​ 469 ​ 469 Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity Level 2 ​ 306,187 ​ 310,930 ​ 127,560 ​ 128,770 Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity Level 2 ​ 70,428 ​ 70,761 ​ 55,324 ​ 54,971 Non-marketable securities ​ Level 2 ​ ​ 16,493 ​ ​ 16,493 ​ ​ 29,751 ​ ​ 29,751 Loans receivable Level 3 ​ 4,353,726 ​ 4,511,357 ​ 4,415,406 ​ 4,481,209 Loans held for sale Level 2 ​ 247,813 ​ 247,813 ​ 117,444 ​ 117,444 Accrued interest receivable Level 2 ​ 18,795 ​ 18,795 ​ 19,157 ​ 19,157 Interest rate swap derivatives Level 2 ​ 18,149 ​ 18,149 ​ 10,175 ​ 10,175 Mortgage banking derivatives ​ Level 3 ​ ​ 7,001 ​ ​ 7,001 ​ ​ 1,515 ​ ​ 1,515 LIABILITIES ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposit transaction accounts Level 2 ​ 4,690,100 ​ 4,690,100 ​ 3,678,979 ​ 3,678,979 Time deposits Level 2 ​ 986,132 ​ 993,070 ​ 1,058,153 ​ 1,058,354 Securities sold under agreements to repurchase Level 2 ​ 22,897 ​ 22,897 ​ 56,935 ​ 56,935 Federal Home Loan Bank advances Level 2 ​ — ​ — ​ 207,675 ​ 207,890 Accrued interest payable Level 2 ​ 6,762 ​ 6,762 ​ 9,328 ​ 9,328 Interest rate swap derivatives ​ Level 2 ​ ​ 57,060 ​ ​ 57,060 ​ 22,558 ​ 22,558 Mortgage banking derivatives Level 3 ​ 2,920 ​ 2,920 ​ ​ 440 ​ ​ 440 ​

Parent Company Only Financial S

Parent Company Only Financial Statements	12 Months Ended
	Dec. 31, 2020
Parent Company Only Financial Statements
Parent Company Only Financial Statements	Note 24 Parent Company Only Financial Statements ​ Parent company only financial information for National Bank Holdings Corporation is summarized as follows: ​ Condensed Statements of Financial Condition ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 December 31, 2019 ASSETS ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 91,402 ​ $ 105,012 Investment in subsidiaries ​ 725,002 ​ 654,508 Other assets ​ 14,809 ​ 18,095 Total assets ​ $ 831,213 ​ $ 777,615 LIABILITIES AND STOCKHOLDERS’ EQUITY ​ ​ ​ ​ ​ ​ Other liabilities ​ $ 10,522 ​ $ 10,695 Total liabilities ​ 10,522 ​ 10,695 Shareholders’ equity ​ 820,691 ​ 766,920 Total liabilities and shareholders’ equity ​ $ 831,213 ​ $ 777,615 ​ Condensed Statements of Operations ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ 2020 2019 2018 Income ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest income ​ $ — ​ $ — ​ $ 112 Equity in undistributed earnings of subsidiaries ​ 67,416 ​ 28,133 ​ 19,682 Distributions from subsidiaries ​ 27,200 ​ 55,725 ​ 47,338 Total income ​ 94,616 ​ 83,858 ​ 67,132 Expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ Salaries and benefits ​ 5,136 ​ 4,925 ​ 4,455 Other expenses ​ 2,621 ​ 2,463 ​ 4,467 Total expenses ​ 7,757 ​ 7,388 ​ 8,922 Income before income taxes ​ 86,859 ​ 76,470 ​ 58,210 Income tax benefit ​ (1,732) ​ (3,895) ​ (3,241) Net income ​ $ 88,591 ​ $ 80,365 ​ $ 61,451 ​ Condensed Statements of Cash Flows ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ 2020 2019 2018 Cash flows from operating activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 88,591 ​ $ 80,365 ​ $ 61,451 Equity in undistributed earnings of subsidiaries ​ (67,416) ​ (28,133) ​ (19,682) Stock-based compensation expense ​ 5,299 ​ 4,869 ​ 4,420 Net excess tax benefit on stock-based compensation ​ ​ 51 ​ ​ (2,160) ​ ​ (1,286) Other ​ 3,074 ​ 5,045 ​ 9,230 Net cash provided by operating activities ​ 29,599 ​ 59,986 ​ 54,133 Cash flows from investing activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Outlay for business combinations ​ ​ — ​ ​ — ​ ​ (36,189) Net cash used in investing activities ​ — ​ — ​ (36,189) Cash flows from financing activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Issuance of stock under purchase and equity compensation plans ​ (749) ​ (6,229) ​ (772) Proceeds from exercise of stock options ​ ​ 1,832 ​ ​ 2,788 ​ ​ 7,576 Payment of dividends ​ (24,816) ​ (23,530) ​ (16,624) Repurchase of shares ​ (19,476) ​ — ​ — Net cash used in financing activities ​ (43,209) ​ (26,971) ​ (9,820) Net increase in cash, cash equivalents and restricted cash ​ (13,610) ​ 33,015 ​ 8,124 Cash, cash equivalents and restricted cash at beginning of the year ​ 115,012 ​ 81,997 ​ 73,873 Cash, cash equivalents and restricted cash at end of the year ​ $ 101,402 ​ $ 115,012 ​ $ 81,997 ​

Quarterly Results of Operations

Quarterly Results of Operations (unaudited)	12 Months Ended
	Dec. 31, 2020
Quarterly Results of Operations (unaudited)
Quarterly Results of Operations (unaudited)	Note 25 Quarterly Results of Operations (unaudited) ​ The following is a summary of quarterly results: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ Fourth Third Second First ​ ​ ​ ​ quarter ​ quarter ​ quarter ​ quarter ​ Total Interest and dividend income ​ $ 53,288 ​ $ 52,302 ​ $ 53,744 ​ $ 58,668 ​ $ 218,002 Interest expense ​ 4,732 ​ 5,587 ​ 6,416 ​ 8,321 ​ 25,056 Net interest income before provision for loan losses ​ 48,556 ​ 46,715 ​ 47,328 ​ 50,347 ​ 192,946 Provision for loan losses ​ — ​ 1,200 ​ 10,271 ​ 6,159 ​ 17,630 Net interest income after provision for loan losses ​ 48,556 ​ 45,515 ​ 37,057 ​ 44,188 ​ 175,316 Non-interest income ​ 33,357 ​ 44,532 ​ 38,837 ​ 23,532 ​ 140,258 Non-interest expense ​ 48,425 ​ 55,321 ​ 53,760 ​ 48,671 ​ 206,177 Income before income taxes ​ 33,488 ​ 34,726 ​ 22,134 ​ 19,049 ​ 109,397 Income tax expense ​ 6,319 ​ 6,833 ​ 4,429 ​ 3,225 ​ 20,806 Net income ​ $ 27,169 ​ $ 27,893 ​ $ 17,705 ​ $ 15,824 ​ $ 88,591 Earnings per share-basic ​ $ 0.88 ​ $ 0.91 ​ $ 0.57 ​ $ 0.51 ​ $ 2.87 Earnings per share-diluted ​ ​ 0.87 ​ ​ 0.90 ​ ​ 0.57 ​ ​ 0.50 ​ ​ 2.85 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ Fourth Third Second First ​ ​ ​ ​ quarter ​ quarter ​ quarter ​ quarter ​ Total Interest and dividend income ​ $ 59,616 ​ $ 61,372 ​ $ 62,193 ​ $ 59,420 ​ $ 242,601 Interest expense ​ 9,228 ​ 9,587 ​ 9,702 ​ 8,254 ​ 36,771 Net interest income before provision for loan losses ​ 50,388 ​ 51,785 ​ 52,491 ​ 51,166 ​ 205,830 Provision for loan losses ​ 1,180 ​ 5,690 ​ 3,239 ​ 1,534 ​ 11,643 Net interest income after provision for loan losses ​ 49,208 ​ 46,095 ​ 49,252 ​ 49,632 ​ 194,187 Non-interest income ​ 20,282 ​ 24,759 ​ 20,660 ​ 17,051 ​ 82,752 Non-interest expense ​ 46,107 ​ 43,793 ​ 46,451 ​ 44,394 ​ 180,745 Income before income taxes ​ 23,383 ​ 27,061 ​ 23,461 ​ 22,289 ​ 96,194 Income tax expense ​ 3,864 ​ 5,419 ​ 3,179 ​ 3,367 ​ 15,829 Net income ​ $ 19,519 ​ $ 21,642 ​ $ 20,282 ​ $ 18,922 ​ $ 80,365 Earnings per share-basic ​ $ 0.62 ​ $ 0.69 ​ $ 0.65 ​ $ 0.61 ​ $ 2.57 Earnings per share-diluted ​ ​ 0.62 ​ ​ 0.69 ​ ​ 0.64 ​ ​ 0.60 ​ ​ 2.55 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2018 ​ Fourth Third Second First ​ ​ ​ ​ quarter ​ quarter ​ quarter ​ quarter ​ Total Interest and dividend income ​ $ 57,780 ​ $ 55,909 ​ $ 54,911 ​ $ 52,791 ​ $ 221,391 Interest expense ​ 7,148 ​ 6,137 ​ 5,525 ​ 5,144 ​ 23,954 Net interest income before provision for loan losses ​ 50,632 ​ 49,772 ​ 49,386 ​ 47,647 ​ 197,437 Provision for loan losses ​ 2,476 ​ 807 ​ 1,873 ​ 41 ​ 5,197 Net interest income after provision for loan losses ​ 48,156 ​ 48,965 ​ 47,513 ​ 47,606 ​ 192,240 Non-interest income ​ 15,317 ​ 18,061 ​ 19,562 ​ 17,835 ​ 70,775 Non-interest expense ​ 42,857 ​ 44,432 ​ 46,763 ​ 55,282 ​ 189,334 Income before income taxes ​ 20,616 ​ 22,594 ​ 20,312 ​ 10,159 ​ 73,681 Income tax expense (benefit) ​ 3,381 ​ 4,354 ​ 2,800 ​ 1,695 ​ 12,230 Net income ​ $ 17,235 ​ $ 18,240 ​ $ 17,512 ​ $ 8,464 ​ $ 61,451 Earnings per share-basic ​ $ 0.56 ​ $ 0.59 ​ $ 0.57 ​ $ 0.28 ​ $ 2.00 Earnings per share-diluted ​ ​ 0.55 ​ ​ 0.58 ​ ​ 0.56 ​ ​ 0.27 ​ ​ 1.95 ​

Acquisition Activities

Acquisition Activities	12 Months Ended
	Dec. 31, 2020
Acquisition Activities
Acquisition Activities	Note 26 Acquisition Activities ​ On January 1, 2018, the Company completed its acquisition of Peoples, Inc. (“Peoples”), the bank holding company of Colorado-based Peoples National Bank and Kansas-based Peoples Bank. Immediately following the completion of the acquisition, Peoples National Bank and Peoples Bank merged into NBH Bank. Pursuant to the merger agreement executed in June 2017, the Company paid $36.2 million of cash consideration and 3,398,477 shares of the Company’s Class A common stock in exchange for all of the outstanding common stock of Peoples. Included in other assets is $10.0 million of restricted cash placed in escrow for certain potential liabilities for which the Company is indemnified pursuant to the merger agreement. The transaction was valued at $146.4 million in the aggregate, based on the Company’s closing price of $32.43 on the acquisition date. Acquisition-related costs of $8.0 million on a pre-tax basis were included in the Company’s consolidated statements of operations for the year ended December 31, 2018. The results of Peoples are included in the results of the Company subsequent to the acquisition date. ​ The table below summarizes the net assets acquired (at fair value) and consideration transferred in connection with the Peoples acquisition: ​ ​ ​ ​ ​ ​ ​ January 1, 2018 Assets: ​ ​ ​ Cash and due from banks ​ $ 105,173 Investment securities available-for-sale ​ ​ 118,512 Non-marketable securities ​ ​ 4,796 Loans ​ ​ 542,707 Loans held for sale ​ ​ 54,260 Other real estate owned ​ ​ 1,253 Premises and equipment ​ ​ 18,584 Core deposit intangible asset ​ ​ 10,477 Mortgage servicing rights ​ ​ 4,301 Other assets ​ ​ 15,361 Total assets acquired ​ ​ 875,424 ​ ​ ​ ​ Liabilities: ​ ​ ​ Total deposits ​ ​ 729,911 FHLB borrowings ​ ​ 33,825 Other liabilities ​ ​ 20,683 Total liabilities assumed ​ ​ 784,419 ​ ​ ​ ​ Identifiable net assets acquired ​ $ 91,005 ​ ​ ​ ​ Consideration: ​ ​ ​ NBHC common stock paid at January 1, 2018, closing price of $32.43 ​ $ 110,213 Cash ​ ​ 36,189 Total ​ ​ 146,402 ​ ​ ​ ​ Goodwill ​ $ 55,397 ​ In connection with the Peoples acquisition, the Company recorded $55.4 million of goodwill, a $10.5 million core deposit intangible asset, a $4.3 million MSRs intangible asset and a $4.0 million mortgage repurchase reserve, included in other liabilities. The core deposit intangible is being amortized straight-line over ten years and the MSRs intangible is amortized in proportion to and over the period of the estimated net servicing income. The FHLB borrowings of $33.8 million were paid off during the first quarter of 2018. The goodwill associated with this transaction is not tax deductible. ​ At the date of acquisition, the gross contractual amounts receivable, inclusive of all principal and interest, was $713.6 million. The Company’s best estimate of the contractual principal cash flows for loans not expected to be collected was $2.1 million.

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 31, 2020
Subsequent Event
Subsequent Event	Note 27 Subsequent Event ​ On February 24, 2021, the Company’s Board of Directors authorized a new program to repurchase up to $75.0 million of the Company’s common stock from time to time either in the open market or in privately negotiated transactions in accordance with applicable regulations of the Securities and Exchange Commission. To date, the Company has repurchased $6.9 million of its previously authorized $50.0 million stock repurchase program announced in February 2020. The new program of $75.0 million replaces this previously authorized program in its entirety.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
Summary of Significant Accounting Policies
Cash and cash equivalents	a) Cash and cash equivalents ​
Investment securities	b) Investment securities ​ Management evaluates all investments in an unrealized loss position on a quarterly basis, and more frequently when economic or market conditions warrant such evaluation. If the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security, the security is written down to fair value and the entire loss is recorded in earnings. If either of the above criteria is not met, we evaluate whether the decline in fair value is the result of credit losses or other factors. In making the assessment, we may consider various factors including the extent to which fair value is less than amortized cost, performance on any underlying collateral, downgrades in the ratings of the security by a rating agency, the failure of the issuer to make scheduled interest or principal payments and adverse conditions specifically related to the security. If the assessment indicates that a credit loss exists, the present value of cash flows expected to be collected are compared to the amortized cost basis of the security and any excess is recorded as an allowance for credit loss. When the loss is not considered a result of credit loss, the cost basis of the security is written down to fair value, with the loss charge recognized in AOCI. The Company does not measure expected credit losses for U.S. agency-backed held-to-maturity securities, since the risk of nonpayment of the amortized cost basis is zero. Credit losses are not estimated for AIR from investment securities as interest deemed uncollectible is written off through interest income. ​ Prior to the adoption of ASU 2016-13, declines in the fair value of held-to-maturity and available-for-sale securities below their cost that were deemed to be other-than-temporarily impaired were reflected in earnings as realized losses. In estimating other-than-temporary-impairment prior to January 1, 2020, the Company considered, among other things, the severity and duration of the unrealized loss position; adverse conditions specifically related to the security; changes in expected future cash flows; downgrades in the rating of the security by a rating agency; the failure of the issuer to make scheduled interest or principal payments; whether the Company had the intent to sell the security; and whether it was more likely than not that the Company would be required to sell the security. ​
Non-marketable securities	c) Non-marketable securities
Loans receivable	d) Loans receivable — ​ Estimated fair values of acquired loans are based on a discounted cash flow methodology that considers various factors including the type of loan and related collateral, the expected timing of cash flows, classification status, fixed or variable interest rate, term of loan and whether or not the loan is amortizing, and a discount rate reflecting the Company’s assessment of risk inherent in the cash flow estimates. Discounts created when the loans are recorded at their estimated fair values at acquisition are accreted over the remaining term of the loan as an adjustment to the related loan’s yield. Similar to originated loans described below, the accrual of interest income on acquired loans is discontinued when the collection of principal or interest, in whole or in part, is doubtful. ​ Interest income on acquired loans and interest income on loans originated by the Company is accrued and credited to income as it is earned using the interest method based on daily balances of the principal amount outstanding. However, interest is generally not accrued on loans 90 days or more past due, unless they are well secured and in the process of collection. Additionally, in certain situations, loans that are not contractually past due may be placed on non-accrual status due to the continued failure to adhere to contractual payment terms by the borrower coupled with other pertinent factors, such as insufficient collateral value or deficient primary and secondary sources of repayment. Accrued interest receivable is reversed when a loan is placed on non-accrual status and payments received generally reduce the carrying value of the loan. Interest is not accrued while a loan is on non-accrual status and interest income is generally recognized on a cash basis only after payment in full of the past due principal and collection of principal outstanding is reasonably assured. A loan may be placed back on accrual status if all contractual payments have been received, or sooner under certain conditions and collection of future principal and interest payments is no longer doubtful. ​ In the event of borrower default, the Company may seek recovery in compliance with state lending laws, the respective loan agreements, and credit monitoring and remediation procedures that may include modifying or restructuring a loan from its original terms, for economic or legal reasons, to provide a concession to the borrower from their original terms due to borrower financial difficulties in order to facilitate repayment. Such restructured loans are considered “troubled debt restructurings” and are identified in accordance with ASC 310-40. ​ The CARES Act afforded financial institutions the option to modify loans within certain parameters in response to the COVID-19 pandemic without requiring the modifications to be classified as TDRs if the borrower has been adversely impacted by COVID-19 and was current on their loan payments. The Company has modified loans due to the effects of the COVID-19 pandemic that were not classified as TDRs. Modifications include deferral of principal as well as full-payment deferral for a period ranging from three months to one year. The number and aggregate balance of COVID-related loan modifications substantially decreased during the third quarter, and we continue to monitor the remaining COVID loan modifications closely. ​
Loans held for sale	e) Loans held for sale — ​ The Company enters into commitments to originate residential mortgage loans whereby the interest rate on the loan is determined prior to funding (i.e. interest rate lock commitments). Such interest rate lock commitments on mortgage loans to be sold in the secondary market are considered to be derivatives. To protect against the price risk inherent in residential mortgage loan commitments, the Company utilizes both "best efforts" and "mandatory delivery" forward loan sale commitments to mitigate the risk of potential increases or decreases in the values of loans that would result from the change in market rates for such loans. The Company manages the interest rate risk on interest rate lock commitments by entering into forward sale contracts of mortgage backed securities. Such contracts are accounted for as derivatives and are recorded at fair value as derivative assets or liabilities. They are carried on the consolidated statements of financial condition within other assets or other liabilities, and changes in fair value are recorded net as a component of mortgage banking income in the consolidated statements of operations. The gross gains on loan sales are recognized based on new loan commitments with adjustment for price and pair-off activity. Commission expenses on loans held for sale are recognized based on loans closed.
Allowance for credit losses	f) Allowance for credit losses Measurement of Credit Losses on Financial Instruments ​ The ACL represents management’s estimate of lifetime credit losses inherent in loans as of the balance sheet date. The Company measures expected credit losses for loans on a pooled basis when similar risk characteristics exist. The Company has identified four primary loan segments that are further stratified into 11 loan classes to provide more granularity in analyzing loss history based upon specific loss drivers and risk factors affecting each loan class. Generally, the underlying risk of loss for each of these loan classes will follow certain norms/trends in various economic environments. Loans that do not share risk characteristics are evaluated on an individual basis and are not included in the collective evaluation. Those loans include loans on non-accrual status, loans in bankruptcy, and TDRs described below. If a specific allowance is warranted based on the borrower’s overall financial condition, the specific allowance is calculated based on discounted expected cash flows using the loan’s initial contractual effective interest rate or the fair value of the collateral less selling costs for collateral-dependent loans. ​ The Company utilizes a DCF model developed within a third-party software tool to establish expected lifetime credit losses for the loan portfolio. The ACL is calculated as the difference between the amortized cost basis and the projections from the DCF analysis. The DCF model allows for individual life of loan cash flow modeling, excluding extensions and renewals, using loan-specific interest rates and repayment schedules adjusted for estimated prepayment rates and loss recovery timing delays. The model incorporates forecasts of certain national macroeconomic factors, including unemployment rates, HPI, retail sales and GDP, which drive correlated probability of default (“PD”) and loss given default (“LGD”) rates. PD and LGD, in turn, drive the losses predicted in establishing our ACL. PD and LGD rates along with prepayment rates and loss recovery time delays are determined at a loan class level making use of both internal and peer historical loss rate data. The determination and application of the ACL accounting policy involves judgments, estimates, and uncertainties that are subject to change. For periods beyond the reasonable and supportable forecast period, we revert to historical long-term average loss rates on a straight-line basis. The length of the forecast period spans four quarters. The length of the reversion period is based on management’s assessment of the length and pattern of the current economic cycle and typically ranges from four to eight quarters. ​ Management accounts for the inherent uncertainty of the underlying economic forecast by reviewing and weighting alternate forecast scenarios. Additionally, the ACL calculation includes subjective adjustments for qualitative risk factors that are likely to cause estimated credit losses to differ from historical experience. These qualitative adjustments may increase or reduce reserve levels and include adjustments for lending management experience and risk tolerance, loan review and audit results, asset quality and portfolio trends, loan portfolio growth and industry concentrations. The Company has elected to exclude AIR from the allowance for credit losses calculation. When a loan is placed on non-accrual, any recorded AIR is reversed against interest income. ​ The determination and application of the ACL accounting policy involves judgments, estimates, and uncertainties that are subject to change. Changes in these assumptions, estimates or the conditions surrounding them may have a material impact on our financial condition, liquidity or results of operations. Various regulatory agencies, as an integral part of the examination process, periodically review the ACL. Such agencies may require the Company to recognize additions to the ACL or reserve increases to adversely graded classified loans based on their judgments about information available to them at the time of their examinations. ​ The ACL is decreased by net charge-offs and is increased by provisions for loan losses that are charged to the statements of operations. Charge-offs, if any, are typically measured for each loan based on a thorough analysis of the most probable source of repayment, such as the present value of the loan’s expected future cash flows, the loan’s estimated fair value, or the estimated fair value of the underlying collateral less costs of disposition for collateral-dependent loans. When it is determined that specific loans, or portions thereof, are uncollectible, these amounts are charged off against the ACL. ​ The Company uses an internal risk rating system to indicate credit quality in the loan portfolio. The risk rating system is applied to all loans and uses a series of grades, which reflect management’s assessment of the risk attributable to loans based on an analysis of the borrower’s financial condition and ability to meet contractual debt service requirements. Loans that management perceives to have acceptable risk are categorized as “Pass” loans. The “Special Mention” loans represent loans that have potential credit weaknesses that deserve management’s close attention. Special mention loans include borrowers that have potential weaknesses or unwarranted risks that, unless corrected, may threaten the borrower’s ability to meet debt requirements. However, these borrowers are still believed to have the ability to respond to and resolve the financial issues that threaten their financial situation. Loans classified as “Substandard” are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Substandard loans have a distinct possibility of loss if the deficiencies are not corrected. “Doubtful” loans are loans that management believes the collection of payments in accordance with the terms of the loan agreement is highly questionable and improbable. Credit quality indicators are reviewed and updated in accordance with internal policy based on loan balance and risk rating. Interest accrual is discontinued on doubtful loans and certain substandard loans, as is more fully discussed in note 4. ​ Unfunded loan commitments ​ In addition to the ACL for funded loans, the Company maintains reserves to cover the risk of loss associated with off-balance sheet unfunded loan commitments. The allowance for off-balance sheet credit losses is maintained within the other liabilities in the statements of financial condition. Under the CECL framework, adjustments to this liability are recorded as provision for credit losses in the statements of operations. Unfunded loan commitment balances are evaluated by loan class and further segregated by revolving and non-revolving commitments. In order to establish the required level of reserve, the Company applies average historical utilization rates and ACL loan model loss rates for each loan class to the outstanding unfunded commitment balances. ​ Prior to the adoption of ASU 2016-13, the Company’s determination of the allowance took into consideration, among other matters, the estimated fair value of the underlying collateral, economic conditions, historical net loan losses, the estimated loss emergence period, estimated default rates, any declines in cash flow assumptions from acquisitions, loan structures, growth factors and other elements that warrant recognition. ​ Under the prior incurred loss methodology, the Company routinely evaluated adversely risk-rated credits for impairment. Impairment, if any, was typically measured for each loan based on a thorough analysis of the most probable source of repayment, including the present value of the loan’s expected future cash flows, the loan’s estimated fair value, or the estimated fair value of the underlying collateral less costs of disposition for collateral dependent loans. General allowances were established for loans with similar characteristics. In this process, general allowance factors were based on an analysis of historical loss and recovery experience, if any, related to originated and acquired loans, as well as certain industry experience, with adjustments made for qualitative or environmental factors that were likely to cause estimated credit losses to differ from historical experience. To the extent that the data supporting such factors had limitations, management’s judgment and experience played a key role in determining the allowance estimates.
Allowance for loan losses	​
Premises and equipment	g) Premises and equipment 7 3 ​
Goodwill and intangible assets	h) Goodwill and intangible assets Company would proceed to perform an additional test to determine whether goodwill has been impaired and calculate the amount of that impairment. ​ Intangible assets that have finite useful lives, such as core deposit intangibles, are amortized over their estimated useful lives. The Company’s core deposit intangible assets represent the value of the anticipated future cost savings that will result from the acquired core deposit relationships versus an alternative source of funding. Judgment may be used in assessing goodwill and intangible assets for impairment. Estimates of fair value are based on projections of revenues, operating costs and cash flows of the reporting unit considering historical and anticipated future results, general economic and market conditions, as well as the impact of planned business or operational strategies. The valuations use a combination of present value techniques to measure fair value considering market factors. Additionally, judgment is used in determining the useful lives of finite-lived intangible assets. Adverse changes in the economic environment, operations of the reporting unit, or changes in judgments and projections could result in a significantly different estimate of the fair value of the reporting unit and could result in an impairment of goodwill and/or intangible assets. ​ MSRs associated with loans originated and sold, where servicing is retained, are initially capitalized at fair value and included in intangible assets on the consolidated statements of financial condition. For subsequent measurement purposes, the Company measures servicing assets based on the lower of cost or market using the amortization method. The values of these capitalized servicing rights are amortized as an offset to the loan servicing income earned in relation to the servicing revenue expected to be earned. The carrying values of these rights are reviewed quarterly for impairment based on the fair value of those assets. For purposes of impairment evaluation and measurement, management stratifies MSRs based on the predominant risk characteristics of the underlying loans, including loan type and loan term. If, by individual stratum, the carrying amount of these MSRs exceeds fair value, a valuation allowance is established and the impairment is recognized in mortgage banking income. If the fair value of impaired MSRs subsequently increases, management recognizes the increase in fair value in current period mortgage banking income and, through a reduction in the valuation allowance, adjusts the carrying value of the MSRs to a level not in excess of amortized cost.
Reserve for Mortgage Loan Repurchase Losses	i) Reserve for Mortgage Loan Repurchase Losses– ​ The Company establishes mortgage repurchase reserves related to various representations and warranties that reflect management’s estimate of losses based on a combination of factors. Such factors incorporate actual and historic loss history, delinquency trends in the portfolio and economic conditions. The Company establishes a reserve at the time loans are sold and updates the reserve estimate quarterly during the estimated loan life. The repurchase reserve is included in other liabilities on the consolidated statements of financial condition.
Other real estate owned	j) Other real estate owned
Bank-owned life insurance	k) Bank-owned life insurance ​
Securities purchased under agreements to resell and securities sold under agreements to repurchase	l) Securities purchased under agreements to resell and securities sold under agreements to repurchase ​
Stock-based compensation	m) Stock-based compensation ​ The fair value of stock options is measured using a Black-Scholes model. The fair value of time-based restricted stock awards and performance stock units with performance based vesting criteria is based on the Company’s stock price on the date of grant. The fair value of performance stock units with market-based vesting criteria is measured using a Monte Carlo simulation model. Compensation expense for the portion of the awards that contain performance and service vesting conditions is recognized over the requisite service period based on the fair value of the awards on the grant date. Compensation expense for the portion of the awards that contain a market vesting condition is recognized over the derived service period based on the fair value of the awards on the grant date. The amortization of stock-based compensation reflects any estimated forfeitures, and the expense realized in subsequent periods may be adjusted to reflect the actual forfeitures realized. The outstanding stock options primarily carry a maximum contractual term of ten years. To the extent that any award is forfeited, surrendered, terminated, expires, or lapses without being vested or exercised, the shares of stock subject to such award not delivered are again made available for awards under the Plan. ​ All excess tax benefits and tax deficiencies (including tax benefits of dividends on share-based payment awards) are recognized in the consolidated statements of operations as a component of income tax expense or benefit and are classified as an operating activity within the Company’s consolidated statements of cash flows. The tax effects of exercised, expired or vested awards are treated as discrete items in the reporting period in which they occur and may result in increased volatility in our effective tax rate. Cash paid by the Company when directly withholding shares for tax withholding purposes is classified as a financing activity in the consolidated statements of cash flows.
Income taxes	n) Income taxes ​ Deferred tax assets and liabilities are recognized for temporary differences between the financial reporting basis and the tax basis of the Company’s assets and liabilities at enacted tax rates expected to be in effect when such amounts are realized or settled. Deferred tax assets and liabilities are adjusted for the effects of changes in tax rates in the period of change. The Company establishes a valuation allowance when management believes, based on the weight of available evidence, it is more likely than not that some portion of the deferred tax assets will not be realized. ​ The Company recognizes and measures income tax benefits based upon a two-step model: 1) a tax position must be more likely than not to be sustained based solely on its technical merits in order to be recognized; and 2) the benefit is measured as the largest dollar amount of that position that is more likely than not to be sustained upon settlement. The difference between the benefit recognized for a position in this model and the tax benefit claimed on a tax return is treated as an unrecognized tax benefit. The Company recognizes income tax related interest and penalties in other non-interest expense.
Earnings per share	o) Earnings per share ​
Interest Rate Swap Derivatives	p) Interest Rate Swap Derivatives ​ The Company offers interest rate swap products to certain of its clients to manage potential changes in interest rates. Each contract between the Company and a client is offset with a contract between the Company and an institutional counterparty, thus minimizing the Company's exposure to rate changes. The Company's portfolio consists of a “matched book,” and as such, changes in fair value of the swap pairs will largely offset in earnings. In accordance with applicable accounting guidance, if certain conditions are met, a derivative may be designated as (1) a hedge of the exposure to changes in the fair value of a recognized asset or liability, or of an unrecognized firm commitment, that are attributable to a particular risk (referred to as a fair value hedge) or (2) a hedge of the exposure to variability in the cash flows of a recognized asset or liability, or of a forecasted transaction, that is attributable to a particular risk (referred to as a cash flow hedge). The Company documents all hedging relationships at the inception of each hedging relationship and uses industry accepted methodologies and ranges to determine the effectiveness of each hedge. The fair value of the hedged item is calculated using the estimated future cash flows of the hedged item and applying discount rates equal to the market interest rate for the hedged item at the inception of the hedging relationship (inception benchmark interest rate plus an inception credit spread), adjusted for changes in the designated benchmark interest rate thereafter. ​
Treasury stock	q) Treasury stock to additional paid-in capital in the consolidated statements of financial condition. If the reissuance price is less than the cost basis (loss), the difference is recorded to additional paid-in capital to the extent there is a cumulative treasury stock paid-in capital balance. Any loss in excess of the cumulative treasury stock paid-in capital balance is charged to retained earnings.
Acquisition activities	r) Acquisition activities ​ Identifiable intangible assets are recognized separately if they arise from contractual or other legal rights or if they are separable (i.e., capable of being sold, transferred, licensed, rented, or exchanged separately from the entity). Deposit liabilities and the related depositor relationship intangible assets, known as the core deposit intangible assets, may be exchanged in observable exchange transactions. As a result, the core deposit intangible asset is considered identifiable, because the separability criterion has been met.

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2020
Investment Securities
Available-for-sale Securities	​ Available-for-sale securities are summarized as follows as of the dates indicated: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ Amortized Gross Gross ​ ​ ​ ​ cost ​ unrealized gains ​ unrealized losses ​ Fair value Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 193,424 ​ $ 2,952 ​ $ (42) ​ $ 196,334 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ 454,345 ​ 8,778 ​ (344) ​ 462,779 Municipal securities ​ ​ 362 ​ ​ 13 ​ ​ — ​ ​ 375 Corporate debt ​ ​ 2,000 ​ ​ — ​ ​ (2) ​ ​ 1,998 Other securities ​ 469 ​ — ​ — ​ 469 Total investment securities available-for-sale ​ $ 650,600 ​ $ 11,743 ​ $ (388) ​ $ 661,955 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ Amortized Gross Gross ​ ​ ​ ​ cost ​ unrealized gains ​ unrealized losses ​ Fair value Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 93,770 ​ $ 1,497 ​ $ (11) ​ $ 95,256 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ 543,275 ​ 3,818 ​ (5,056) ​ 542,037 Municipal securities ​ ​ 495 ​ ​ — ​ ​ (8) ​ ​ 487 Other securities ​ 469 ​ — ​ — ​ 469 Total investment securities available-for-sale ​ $ 638,009 ​ $ 5,315 ​ $ (5,075) ​ $ 638,249
Summary of unrealized losses for available-for-sale securities	The tables below summarize the available-for-sale securities with unrealized losses as of the dates shown, along with the length of the impairment period: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Less than 12 months ​ 12 months or more ​ Total ​ Fair Unrealized Fair Unrealized Fair Unrealized ​ ​ value ​ losses ​ value ​ losses ​ value ​ losses Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 26,878 ​ $ (42) ​ $ 1 ​ $ — ​ $ 26,879 ​ $ (42) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ ​ 95,888 ​ ​ (328) ​ ​ 2,138 ​ ​ (16) ​ ​ 98,026 ​ ​ (344) Corporate debt ​ ​ 1,998 ​ ​ (2) ​ ​ — ​ ​ — ​ ​ 1,998 ​ ​ (2) Total ​ $ 124,764 ​ $ (372) ​ $ 2,139 ​ $ (16) ​ $ 126,903 ​ $ (388) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ Less than 12 months ​ 12 months or more ​ Total ​ Fair Unrealized Fair Unrealized Fair Unrealized ​ ​ value ​ losses ​ value ​ losses ​ value ​ losses Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 10,413 ​ $ (7) ​ $ 1,421 ​ $ (4) ​ $ 11,834 ​ $ (11) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ 41,983 ​ ​ (281) ​ 254,380 ​ (4,775) ​ 296,363 ​ ​ (5,056) Municipal securities ​ ​ — ​ ​ — ​ ​ 372 ​ ​ (8) ​ ​ 372 ​ ​ (8) Total ​ $ 52,396 ​ $ (288) ​ $ 256,173 ​ $ (4,787) ​ $ 308,569 ​ $ (5,075)
Held-to-maturity Securities	Held-to-maturity investment securities are summarized as follows as of the dates indicated: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ Gross Gross ​ ​ ​ ​ Amortized ​ unrealized ​ unrealized ​ ​ ​ ​ ​ cost ​ gains ​ losses ​ Fair value Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 306,187 ​ $ 4,940 ​ $ (197) ​ $ 310,930 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ 70,428 ​ 396 ​ (63) ​ 70,761 Total investment securities held-to-maturity ​ $ 376,615 ​ $ 5,336 ​ $ (260) ​ $ 381,691 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ Gross Gross ​ ​ ​ ​ Amortized ​ unrealized ​ unrealized ​ ​ ​ ​ ​ cost ​ gains ​ losses ​ Fair value Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 127,560 ​ $ 1,239 ​ $ (29) ​ $ 128,770 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ 55,324 ​ 82 ​ (435) ​ 54,971 Total investment securities held-to-maturity ​ $ 182,884 ​ $ 1,321 ​ $ (464) ​ $ 183,741
Summary of unrealized losses for held-to-maturity securities	During 2020 and 2019, purchases of held-to-maturity securities totaled $284.2 million and $10.2 million, respectively. Maturities and paydowns of held-to-maturity securities totaled $88.1 million and $60.9 million during 2020 and 2019, respectively. ​ The held-to-maturity portfolio included nine securities which were in an unrealized loss position at December 31, 2020, compared to 13 securities at December 31, 2019. The tables below summarize the held-to-maturity securities with unrealized losses as of the dates shown, along with the length of the impairment period: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Less than 12 months ​ 12 months or more ​ Total ​ Fair Unrealized Fair Unrealized Fair Unrealized ​ ​ value ​ losses ​ value ​ losses ​ value ​ losses Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 53,453 ​ $ (197) ​ $ — ​ $ — ​ $ 53,453 ​ $ (197) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ ​ 19,554 ​ ​ (63) ​ ​ — ​ ​ — ​ ​ 19,554 ​ ​ (63) Total ​ $ 73,007 ​ $ (260) ​ $ — ​ $ — ​ $ 73,007 ​ $ (260) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ Less than 12 months ​ 12 months or more ​ Total ​ Fair Unrealized Fair Unrealized Fair Unrealized ​ ​ value ​ losses ​ value ​ losses ​ value ​ losses Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 10,478 ​ $ (26) ​ $ 338 ​ $ (3) ​ $ 10,816 ​ $ (29) Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ 3,925 ​ ​ (9) ​ ​ 28,554 ​ ​ (426) ​ 32,479 ​ ​ (435) Total ​ $ 14,403 ​ $ (35) ​ $ 28,892 ​ $ (429) ​ $ 43,295 ​ $ (464)

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2020
Loans
Loan Portfolio Composition Including Carrying Value by Segment of Originated and Acquired Loans Accounted for under ASC Topic 310-30 and Loans Covered by the FDIC Loss Sharing Agreements	​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ Total loans % of total Commercial $ 3,044,065 ​ 70.0% Commercial real estate non-owner occupied 631,996 ​ 14.5% Residential real estate 658,659 ​ 15.1% Consumer 19,006 ​ 0.4% Total $ 4,353,726 ​ 100.0% ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ Total loans % of total Commercial $ 2,992,307 ​ 67.8% Commercial real estate non-owner occupied 630,906 ​ 14.3% Residential real estate 770,417 ​ 17.4% Consumer 21,776 ​ 0.5% Total $ 4,415,406 ​ 100.0%
Past Due Financing Receivables	Information about delinquent and non-accrual loans is shown in the following tables at December 31, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ Greater ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 30-89 days ​ than 90 days ​ ​ ​ Total past ​ ​ ​ ​ ​ ​ past due and ​ past due and ​ Non-accrual ​ due and ​ ​ ​ ​ ​ ​ accruing ​ accruing ​ loans ​ non-accrual ​ Current ​ Total loans Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ $ 170 ​ $ — ​ $ 6,312 ​ $ 6,482 ​ $ 1,440,256 ​ $ 1,446,738 Municipal and non-profit ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 870,791 ​ ​ 870,791 Owner occupied commercial real estate ​ ​ — ​ ​ — ​ ​ 5,450 ​ ​ 5,450 ​ ​ 510,789 ​ ​ 516,239 Food and agribusiness ​ ​ 146 ​ ​ — ​ ​ 422 ​ ​ 568 ​ ​ 209,729 ​ ​ 210,297 Total commercial ​ ​ 316 ​ ​ — ​ ​ 12,184 ​ ​ 12,500 ​ ​ 3,031,565 ​ ​ 3,044,065 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ — ​ — ​ — ​ — ​ 91,125 ​ 91,125 Acquisition/development ​ — ​ — ​ 6 ​ 6 ​ 24,665 ​ 24,671 Multifamily ​ — ​ — ​ 1,523 ​ 1,523 ​ 67,233 ​ 68,756 Non-owner occupied ​ — ​ — ​ 135 ​ 135 ​ 447,309 ​ 447,444 Total commercial real estate ​ — ​ — ​ 1,664 ​ 1,664 ​ 630,332 ​ 631,996 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ ​ 527 ​ ​ 160 ​ ​ 5,820 ​ ​ 6,507 ​ ​ 577,764 ​ ​ 584,271 Junior lien ​ 95 ​ ​ — ​ ​ 709 ​ 804 ​ 73,584 ​ ​ 74,388 Total residential real estate ​ 622 ​ ​ 160 ​ ​ 6,529 ​ ​ 7,311 ​ ​ 651,348 ​ ​ 658,659 Consumer ​ 30 ​ 2 ​ 10 ​ 42 ​ 18,964 ​ 19,006 Total loans ​ $ 968 ​ $ 162 ​ $ 20,387 ​ $ 21,517 ​ $ 4,332,209 ​ $ 4,353,726 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ Non-accrual loans ​ Non-accrual loans ​ ​ ​ ​ with a related ​ with no related ​ ​ ​ ​ allowance for ​ allowance for ​ Non-accrual ​ credit loss ​ credit loss ​ loans Commercial: ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial $ 6,080 ​ $ 232 ​ $ 6,312 Municipal and non-profit ​ — ​ ​ — ​ ​ — Owner occupied commercial real estate ​ 2,698 ​ ​ 2,752 ​ ​ 5,450 Food and agribusiness ​ 88 ​ ​ 334 ​ ​ 422 Total commercial ​ 8,866 ​ ​ 3,318 ​ ​ 12,184 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ Construction — ​ — ​ — Acquisition/development 6 ​ — ​ 6 Multifamily — ​ 1,523 ​ 1,523 Non-owner occupied 135 ​ — ​ 135 Total commercial real estate 141 ​ 1,523 ​ 1,664 Residential real estate: ​ ​ ​ ​ ​ Senior lien ​ 4,158 ​ ​ 1,662 ​ ​ 5,820 Junior lien ​ 709 ​ ​ — ​ 709 Total residential real estate ​ 4,867 ​ ​ 1,662 ​ 6,529 Consumer 10 ​ — ​ 10 Total loans $ 13,884 ​ $ 6,503 ​ $ 20,387 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ ​ Greater ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 30-89 days ​ than 90 days ​ ​ ​ Total past ​ ​ ​ ​ ​ ​ past due and ​ past due and ​ Non-accrual ​ due and ​ ​ ​ ​ ​ ​ accruing ​ accruing ​ loans ​ non-accrual ​ Current ​ Total loans Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ $ 2,251 ​ $ 879 ​ $ 10,330 ​ $ 13,460 ​ $ 1,398,071 ​ $ 1,411,531 Municipal and non-profit ​ ​ 226 ​ ​ — ​ ​ — ​ ​ 226 ​ ​ 837,300 ​ ​ 837,526 Owner occupied commercial real estate ​ 595 ​ 630 ​ ​ 2,264 ​ 3,489 ​ 486,633 ​ 490,122 Food and agribusiness ​ 190 ​ — ​ ​ 317 ​ 507 ​ 252,621 ​ 253,128 Total commercial ​ ​ 3,262 ​ ​ 1,509 ​ ​ 12,911 ​ ​ 17,682 ​ ​ 2,974,625 ​ ​ 2,992,307 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ — ​ — ​ — ​ — ​ 77,733 ​ 77,733 Acquisition/development ​ 187 ​ — ​ 416 ​ 603 ​ 26,276 ​ 26,879 Multifamily ​ — ​ — ​ — ​ — ​ 55,808 ​ 55,808 Non-owner occupied ​ 438 ​ 65 ​ 43 ​ 546 ​ 469,940 ​ 470,486 Total commercial real estate ​ 625 ​ 65 ​ 459 ​ 1,149 ​ 629,757 ​ 630,906 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ 2,101 ​ 9 ​ ​ 7,597 ​ 9,707 ​ 668,955 ​ ​ 678,662 Junior lien ​ 245 ​ 79 ​ ​ 731 ​ ​ 1,055 ​ ​ 90,700 ​ ​ 91,755 Total residential real estate ​ 2,346 ​ 88 ​ ​ 8,328 ​ ​ 10,762 ​ ​ 759,655 ​ ​ 770,417 Consumer ​ 116 ​ — ​ 50 ​ ​ 166 ​ ​ 21,610 ​ ​ 21,776 Total loans ​ $ 6,349 ​ $ 1,662 ​ $ 21,748 ​ $ 29,759 ​ $ 4,385,647 ​ $ 4,415,406
Credit Exposure for Loans as Determined by Company's Internal Risk Rating System	The amortized cost basis for all loans as determined by the Company’s internal risk rating system and year of origination was as follows at December 31, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ Revolving ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ loans ​ loans ​ ​ ​ ​ ​ Origination year ​ amortized ​ converted ​ ​ ​ ​ ​ 2020 ​ 2019 ​ 2018 ​ 2017 ​ 2016 ​ Prior ​ cost basis ​ to term ​ Total Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 372,041 ​ $ 212,388 ​ $ 189,753 ​ $ 93,822 ​ $ 15,145 ​ $ 17,662 ​ $ 499,283 ​ $ 991 ​ $ 1,401,085 Special mention ​ ​ — ​ ​ 1,445 ​ ​ 7,381 ​ ​ 4,845 ​ ​ 5,810 ​ ​ 729 ​ ​ 2,329 ​ ​ 1,478 ​ ​ 24,017 Substandard ​ ​ 23 ​ ​ 1,238 ​ ​ 925 ​ ​ 11,885 ​ ​ 56 ​ ​ 4,840 ​ ​ 1,341 ​ ​ — ​ ​ 20,308 Doubtful ​ ​ — ​ ​ — ​ ​ 34 ​ ​ 456 ​ ​ — ​ ​ 809 ​ ​ 29 ​ ​ — ​ ​ 1,328 Total commercial and industrial ​ ​ 372,064 ​ ​ 215,071 ​ ​ 198,093 ​ ​ 111,008 ​ ​ 21,011 ​ ​ 24,040 ​ ​ 502,982 ​ ​ 2,469 ​ ​ 1,446,738 Municipal and non-profit: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 131,961 ​ ​ 91,911 ​ ​ 125,247 ​ ​ 156,275 ​ ​ 124,269 ​ ​ 238,453 ​ ​ 2,675 ​ ​ — ​ ​ 870,791 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total municipal and non-profit ​ ​ 131,961 ​ ​ 91,911 ​ ​ 125,247 ​ ​ 156,275 ​ ​ 124,269 ​ ​ 238,453 ​ ​ 2,675 ​ ​ — ​ ​ 870,791 Owner occupied commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 100,791 ​ ​ 107,558 ​ ​ 90,398 ​ ​ 53,131 ​ ​ 32,648 ​ ​ 87,758 ​ ​ 1,401 ​ ​ — ​ ​ 473,685 Special mention ​ ​ 1,581 ​ ​ 2,236 ​ ​ 2,714 ​ ​ 544 ​ ​ 3,254 ​ ​ 19,341 ​ ​ — ​ ​ — ​ ​ 29,670 Substandard ​ ​ — ​ ​ 1,988 ​ ​ 6,211 ​ ​ 251 ​ ​ 93 ​ ​ 3,802 ​ ​ — ​ ​ — ​ ​ 12,345 Doubtful ​ ​ — ​ ​ 511 ​ ​ — ​ ​ — ​ ​ — ​ ​ 28 ​ ​ — ​ ​ — ​ ​ 539 Total owner occupied commercial real estate ​ ​ 102,372 ​ ​ 112,293 ​ ​ 99,323 ​ ​ 53,926 ​ ​ 35,995 ​ ​ 110,929 ​ ​ 1,401 ​ ​ — ​ ​ 516,239 Food and agribusiness: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 28,139 ​ ​ 9,198 ​ ​ 20,242 ​ ​ 7,198 ​ ​ 9,556 ​ ​ 28,330 ​ ​ 106,007 ​ ​ 126 ​ ​ 208,796 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 222 ​ ​ — ​ ​ — ​ ​ 222 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ 302 ​ ​ — ​ ​ 977 ​ ​ — ​ ​ — ​ ​ 1,279 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total food and agribusiness ​ ​ 28,139 ​ ​ 9,198 ​ ​ 20,242 ​ ​ 7,500 ​ ​ 9,556 ​ ​ 29,529 ​ ​ 106,007 ​ ​ 126 ​ ​ 210,297 Total commercial ​ ​ 634,536 ​ ​ 428,473 ​ ​ 442,905 ​ ​ 328,709 ​ ​ 190,831 ​ ​ 402,951 ​ ​ 613,065 ​ ​ 2,595 ​ ​ 3,044,065 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 15,841 ​ ​ 49,658 ​ ​ 17,349 ​ ​ 4,072 ​ ​ — ​ ​ — ​ ​ 2,006 ​ ​ 1,807 ​ ​ 90,733 Special mention ​ ​ 392 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 392 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total construction ​ ​ 16,233 ​ ​ 49,658 ​ ​ 17,349 ​ ​ 4,072 ​ ​ — ​ ​ — ​ ​ 2,006 ​ ​ 1,807 ​ ​ 91,125 Acquisition/development: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 3,762 ​ ​ 1,997 ​ ​ 1,947 ​ ​ 8,373 ​ ​ 4,559 ​ ​ 3,694 ​ ​ 11 ​ ​ — ​ ​ 24,343 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ 34 ​ ​ — ​ ​ 253 ​ ​ — ​ ​ — ​ ​ 287 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 41 ​ ​ — ​ ​ — ​ ​ 41 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total acquisition/development ​ ​ 3,762 ​ ​ 1,997 ​ ​ 1,947 ​ ​ 8,407 ​ ​ 4,559 ​ ​ 3,988 ​ ​ 11 ​ ​ — ​ ​ 24,671 Multifamily: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 29,738 ​ ​ 13,670 ​ ​ 137 ​ ​ 212 ​ ​ 18,050 ​ ​ 4,990 ​ ​ — ​ ​ — ​ ​ 66,797 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 436 ​ ​ — ​ ​ — ​ ​ 436 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 1,523 ​ ​ — ​ ​ — ​ ​ 1,523 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total multifamily ​ ​ 29,738 ​ ​ 13,670 ​ ​ 137 ​ ​ 212 ​ ​ 18,050 ​ ​ 6,949 ​ ​ — ​ ​ — ​ ​ 68,756 Non-owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 51,445 ​ ​ 92,225 ​ ​ 25,362 ​ ​ 86,975 ​ ​ 26,613 ​ ​ 118,144 ​ ​ 3,083 ​ ​ 643 ​ ​ 404,490 Special mention ​ ​ 70 ​ ​ 5,458 ​ ​ 5,841 ​ ​ 22,737 ​ ​ — ​ ​ 3,662 ​ ​ 100 ​ ​ — ​ ​ 37,868 Substandard ​ ​ — ​ ​ — ​ ​ 779 ​ ​ — ​ ​ 3,937 ​ ​ 370 ​ ​ — ​ ​ — ​ ​ 5,086 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total non-owner occupied ​ ​ 51,515 ​ ​ 97,683 ​ ​ 31,982 ​ ​ 109,712 ​ ​ 30,550 ​ ​ 122,176 ​ ​ 3,183 ​ ​ 643 ​ ​ 447,444 Total commercial real estate non-owner occupied ​ ​ 101,248 ​ ​ 163,008 ​ ​ 51,415 ​ ​ 122,403 ​ ​ 53,159 ​ ​ 133,113 ​ ​ 5,200 ​ ​ 2,450 ​ ​ 631,996 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ Revolving ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ loans ​ loans ​ ​ ​ ​ ​ Origination year ​ amortized ​ converted ​ ​ ​ ​ ​ 2020 ​ 2019 ​ 2018 ​ 2017 ​ 2016 ​ Prior ​ cost basis ​ to term ​ Total Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 129,551 ​ ​ 76,504 ​ ​ 36,493 ​ ​ 47,887 ​ ​ 88,358 ​ ​ 173,091 ​ ​ 24,884 ​ ​ 218 ​ ​ 576,986 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 463 ​ ​ — ​ ​ — ​ ​ 463 Substandard ​ ​ 95 ​ ​ 818 ​ ​ 20 ​ ​ 1,232 ​ ​ 550 ​ ​ 4,107 ​ ​ — ​ ​ — ​ ​ 6,822 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total senior lien ​ ​ 129,646 ​ ​ 77,322 ​ ​ 36,513 ​ ​ 49,119 ​ ​ 88,908 ​ ​ 177,661 ​ ​ 24,884 ​ ​ 218 ​ ​ 584,271 Junior lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 3,479 ​ ​ 4,217 ​ ​ 2,553 ​ ​ 1,775 ​ ​ 1,226 ​ ​ 3,760 ​ ​ 55,860 ​ ​ 365 ​ ​ 73,235 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 21 ​ ​ 341 ​ ​ — ​ ​ 362 Substandard ​ ​ — ​ ​ 112 ​ ​ 101 ​ ​ 177 ​ ​ 55 ​ ​ 287 ​ ​ — ​ ​ 59 ​ ​ 791 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total junior lien ​ ​ 3,479 ​ ​ 4,329 ​ ​ 2,654 ​ ​ 1,952 ​ ​ 1,281 ​ ​ 4,068 ​ ​ 56,201 ​ ​ 424 ​ ​ 74,388 Total residential real estate ​ ​ 133,125 ​ ​ 81,651 ​ ​ 39,167 ​ ​ 51,071 ​ ​ 90,189 ​ ​ 181,729 ​ ​ 81,085 ​ ​ 642 ​ ​ 658,659 Consumer ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 9,777 ​ ​ 3,348 ​ ​ 1,674 ​ ​ 489 ​ ​ 329 ​ ​ 623 ​ ​ 2,700 ​ ​ 19 ​ ​ 18,959 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Substandard ​ ​ — ​ ​ — ​ ​ 37 ​ ​ — ​ ​ 2 ​ ​ 8 ​ ​ — ​ ​ — ​ ​ 47 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total consumer ​ ​ 9,777 ​ ​ 3,348 ​ ​ 1,711 ​ ​ 489 ​ ​ 331 ​ ​ 631 ​ ​ 2,700 ​ ​ 19 ​ ​ 19,006 Total loans ​ $ 878,686 ​ $ 676,480 ​ $ 535,198 ​ $ 502,672 ​ $ 334,510 ​ $ 718,424 ​ $ 702,050 ​ $ 5,706 ​ $ 4,353,726 ​ Credit exposure for all loans as determined by the Company’s internal risk rating system was as follows at December 31, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ Special ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ mention ​ Substandard ​ Doubtful ​ Total Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ $ 1,366,457 ​ $ 28,226 ​ $ 15,132 ​ $ 1,716 ​ $ 1,411,531 Municipal and non-profit ​ ​ 837,526 ​ ​ — ​ ​ — ​ ​ — ​ ​ 837,526 Owner occupied commercial real estate ​ 439,315 ​ ​ 39,986 ​ ​ 10,821 ​ ​ — ​ 490,122 Food and agribusiness ​ 249,930 ​ ​ 1,408 ​ ​ 1,758 ​ ​ 32 ​ ​ 253,128 Total commercial ​ ​ 2,893,228 ​ ​ 69,620 ​ ​ 27,711 ​ ​ 1,748 ​ ​ 2,992,307 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ 77,733 ​ ​ — ​ ​ — ​ ​ — ​ 77,733 Acquisition/development ​ 26,229 ​ ​ — ​ ​ 650 ​ ​ — ​ 26,879 Multifamily ​ 55,325 ​ ​ — ​ ​ 483 ​ ​ — ​ 55,808 Non-owner occupied ​ 454,045 ​ ​ 15,307 ​ ​ 1,134 ​ ​ — ​ 470,486 Total commercial real estate ​ 613,332 ​ ​ 15,307 ​ ​ 2,267 ​ ​ — ​ 630,906 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ 668,452 ​ ​ 441 ​ ​ 9,769 ​ ​ — ​ 678,662 Junior lien ​ 90,540 ​ ​ 365 ​ ​ 850 ​ ​ — ​ 91,755 Total residential real estate ​ 758,992 ​ 806 ​ 10,619 ​ — ​ 770,417 Consumer ​ 21,725 ​ ​ 1 ​ ​ 50 ​ ​ — ​ ​ 21,776 Total loans ​ $ 4,287,277 ​ $ 85,734 ​ $ 40,647 ​ $ 1,748 ​ $ 4,415,406
Schedule Of Impaired Financing Receivable With And Without Related Allowance	Additional information regarding impaired loans at December 31, 2019 and 2018 is set forth in the table below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ December 31, 2018 ​ ​ Unpaid ​ ​ ​ ​ Allowance ​ Unpaid ​ ​ ​ ​ Allowance ​ ​ principal ​ Recorded ​ for losses ​ principal ​ Recorded ​ for losses ​ ​ balance ​ investment ​ allocated ​ balance ​ investment ​ allocated With no related allowance recorded: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ $ 16,001 ​ $ 10,548 ​ $ — ​ $ 9,740 ​ $ 3,771 ​ $ — Municipal and non-profit ​ — ​ — ​ — ​ — ​ — ​ — Owner occupied commercial real estate ​ 3,265 ​ 2,385 ​ — ​ 7,130 ​ 6,609 ​ — Food and agribusiness ​ ​ 1,468 ​ 1,220 ​ — ​ ​ 1,468 ​ 1,260 ​ — Total commercial ​ ​ 20,734 ​ 14,153 ​ — ​ ​ 18,338 ​ 11,640 ​ — Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ — ​ — ​ — ​ 1,435 ​ 1,208 ​ — Acquisition/development ​ 458 ​ 415 ​ — ​ 378 ​ 121 ​ — Multifamily ​ — ​ — ​ — ​ — ​ — ​ — Non-owner occupied ​ 90 ​ 26 ​ — ​ 641 ​ 547 ​ — Total commercial real estate ​ 548 ​ 441 ​ — ​ 2,454 ​ 1,876 ​ — Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ 4,355 ​ 3,967 ​ — ​ 4,229 ​ 3,814 ​ — Junior lien ​ 311 ​ 269 ​ — ​ 409 ​ 341 ​ — Total residential real estate ​ 4,666 ​ 4,236 ​ — ​ 4,638 ​ 4,155 ​ — Consumer ​ 57 ​ 50 ​ — ​ 46 ​ 42 ​ — Total impaired loans with no related allowance recorded ​ $ 26,005 ​ $ 18,880 ​ $ — ​ $ 25,476 ​ $ 17,713 ​ $ — With a related allowance recorded: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ $ 13,768 ​ $ 6,435 ​ $ 1,725 ​ $ 7,252 ​ $ 4,627 ​ $ 996 Municipal and non-profit ​ — ​ — ​ — ​ — ​ — ​ — Owner occupied commercial real estate ​ 711 ​ 505 ​ 3 ​ 1,362 ​ 1,169 ​ 90 Food and agribusiness ​ ​ 757 ​ ​ 751 ​ ​ 35 ​ ​ 883 ​ ​ 845 ​ ​ 46 Total commercial ​ ​ 15,236 ​ 7,691 ​ 1,763 ​ ​ 9,497 ​ 6,641 ​ 1,132 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ — ​ — ​ — ​ — ​ — ​ — Acquisition/development ​ — ​ — ​ — ​ — ​ — ​ — Multifamily ​ — ​ — ​ — ​ — ​ — ​ — Non-owner occupied ​ 232 ​ 171 ​ 1 ​ 313 ​ 254 ​ 2 Total commercial real estate ​ 232 ​ 171 ​ 1 ​ 313 ​ 254 ​ 2 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ 5,808 ​ 5,034 ​ 25 ​ 6,032 ​ 5,178 ​ 27 Junior lien ​ 1,074 ​ 987 ​ 6 ​ 1,408 ​ 1,293 ​ 8 Total residential real estate ​ 6,882 ​ 6,021 ​ 31 ​ 7,440 ​ 6,471 ​ 35 Consumer ​ — ​ — ​ — ​ — ​ — ​ — Total impaired loans with a related allowance recorded ​ $ 22,350 ​ $ 13,883 ​ $ 1,795 ​ $ 17,250 ​ $ 13,366 ​ $ 1,169 Total impaired loans ​ $ 48,355 ​ $ 32,763 ​ $ 1,795 ​ $ 42,726 ​ $ 31,079 ​ $ 1,169
Schedule of Impaired Financing Receivable, Average Recorded Investment and Interest Income Recognized	The table below shows additional information regarding the average recorded investment and interest income recognized on impaired loans for the years presented: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended ​ ​ December 31, 2019 ​ December 31, 2018 ​ ​ Average Interest Average Interest With no related allowance recorded: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ $ 13,062 ​ $ 248 ​ $ 4,132 ​ $ 168 Municipal and non-profit ​ — ​ — ​ — ​ — Owner occupied commercial real estate ​ 2,849 ​ 27 ​ 6,799 ​ 38 Food and agribusiness ​ ​ 1,316 ​ ​ — ​ ​ 1,259 ​ ​ 98 Total commercial ​ ​ 17,227 ​ ​ 275 ​ ​ 12,190 ​ ​ 304 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ — ​ — ​ 1,208 ​ — Acquisition/development ​ 575 ​ — ​ 606 ​ — Multifamily ​ — ​ — ​ — ​ — Non-owner occupied ​ 28 ​ — ​ 573 ​ — Total commercial real estate ​ 603 ​ ​ — ​ 2,387 ​ ​ — Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ 4,081 ​ 1 ​ 3,904 ​ 0 Junior lien ​ 287 ​ 2 ​ 355 ​ 2 Total residential real estate ​ 4,368 ​ ​ 3 ​ 4,259 ​ ​ 2 Consumer ​ 11 ​ — ​ 12 ​ — Total impaired loans with no related allowance recorded ​ $ 22,209 ​ $ 278 ​ $ 18,848 ​ $ 306 With a related allowance recorded: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial ​ $ 6,653 ​ $ — ​ $ 4,677 ​ $ — Municipal and non-profit ​ 554 ​ 17 ​ 1,220 ​ 19 Owner occupied commercial real estate ​ 796 ​ 12 ​ 862 ​ 5 Food and agribusiness ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total commercial ​ ​ 8,003 ​ ​ 29 ​ ​ 6,759 ​ ​ 24 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ — ​ — ​ — ​ — Acquisition/development ​ — ​ — ​ — ​ — Multifamily ​ — ​ — ​ — ​ — Non-owner occupied ​ 207 ​ 14 ​ 288 ​ 16 Total commercial real estate ​ 207 ​ ​ 14 ​ 288 ​ ​ 16 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ 5,241 ​ 66 ​ 5,412 ​ 57 Junior lien ​ 1,034 ​ 34 ​ 1,331 ​ 43 Total residential real estate ​ 6,275 ​ ​ 100 ​ 6,743 ​ ​ 100 Consumer ​ 49 ​ — ​ 36 ​ — Total impaired loans with a related allowance recorded ​ $ 14,534 ​ $ 143 ​ $ 13,826 ​ $ 140 Total impaired loans ​ $ 36,743 ​ $ 421 ​ $ 32,674 ​ $ 446
Schedule of collateral dependent loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ Total amortized ​ Real property ​ Business assets ​ cost basis Commercial ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial $ 7,579 ​ $ 3,005 ​ $ 10,584 Owner-occupied commercial real estate ​ 3,701 ​ ​ 284 ​ ​ 3,985 Food and agribusiness ​ 334 ​ ​ — ​ ​ 334 Total Commercial ​ 11,614 ​ ​ 3,289 ​ ​ 14,903 Commercial real estate non owner-occupied ​ ​ ​ ​ ​ ​ ​ ​ Acquisition/development 1,573 ​ — ​ 1,573 Multifamily 1,523 ​ — ​ 1,523 Total commercial real estate 3,096 ​ — ​ 3,096 Residential real estate ​ ​ ​ ​ ​ Senior lien 2,021 ​ — ​ 2,021 Total residential real estate 2,021 ​ — ​ 2,021 Total loans $ 16,731 ​ $ 3,289 ​ $ 20,020
Additional Information Related to Accruing TDR's	​ The tables below provide additional information related to accruing TDRs at December 31, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Amortized ​ Average year-to-date ​ Unpaid ​ Unfunded commitments ​ ​ cost basis ​ amortized cost basis ​ principal balance ​ to fund TDRs Commercial ​ $ 9,387 ​ $ 9,544 ​ $ 9,978 ​ $ 150 Commercial real estate non-owner occupied ​ 2,400 ​ 2,351 ​ 4,105 ​ — Residential real estate ​ 2,121 ​ 2,185 ​ 2,922 ​ 12 Consumer ​ 37 ​ 37 ​ 37 ​ — Total ​ $ 13,945 ​ $ 14,117 ​ $ 17,042 ​ $ 162 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ Recorded ​ Average year-to-date ​ Unpaid ​ Unfunded commitments ​ ​ investment ​ recorded investment ​ principal balance ​ to fund TDRs Commercial ​ $ 5,615 ​ $ 5,788 ​ $ 5,714 ​ $ — Commercial real estate non-owner occupied ​ 141 ​ 172 ​ 192 ​ — Residential real estate ​ 1,129 ​ 1,178 ​ 1,206 ​ 12 Consumer ​ — ​ — ​ — ​ — Total ​ $ 6,885 ​ $ 7,138 ​ $ 7,112 ​ $ 12
Summary of Company's Carrying Value of Non-Accrual TDR's	The following table summarizes the Company’s carrying value of non-accrual TDRs as of December 31, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ December 31, 2019 Commercial $ 3,397 $ 1,891 Commercial real estate non-owner occupied ​ 1,644 ​ 410 Residential real estate ​ 3,156 ​ 2,553 Consumer ​ — ​ — Total non-accruing TDRs ​ $ 8,197 ​ $ 4,854

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2020
Allowance for Credit Losses
Summary of Company's Allowance for Loan Losses ("ALL") and Recorded Investment in Loans	The tables below detail the Company’s allowance for credit losses as of the dates shown: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2020 ​ ​ ​ ​ Non-owner ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ commercial ​ Residential ​ ​ ​ ​ ​ ​ ​ Commercial ​ real estate ​ real estate ​ Consumer ​ Total Beginning balance ​ $ 30,442 ​ $ 4,850 ​ $ 3,468 ​ $ 304 ​ $ 39,064 Cumulative effect adjustment (1) ​ ​ (1,299) ​ ​ 1,666 ​ ​ 5,314 ​ ​ 155 ​ ​ 5,836 Charge-offs ​ (2,023) ​ (412) ​ (67) ​ (726) ​ (3,228) Recoveries ​ 394 ​ — ​ 32 ​ 145 ​ 571 Provision ​ 2,862 ​ 11,344 ​ 2,745 ​ 583 ​ 17,534 Ending balance ​ 30,376 ​ 17,448 ​ 11,492 ​ 461 ​ 59,777 ​ ​ ​ ​ (1) ​ Related to the adoption of Accounting Standards Update No. 2016-13, Measurement of Credit Losses on Financial Instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2019 ​ ​ ​ ​ Non-owner ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ commercial ​ Residential ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ real estate ​ real estate ​ Consumer ​ Total Beginning balance ​ $ 27,137 ​ $ 4,406 ​ $ 3,800 ​ $ 349 ​ $ 35,692 Charge-offs ​ (7,422) ​ (116) ​ (124) ​ (937) ​ (8,599) Recoveries ​ 102 ​ 12 ​ 34 ​ 180 ​ 328 Provision ​ 10,625 ​ 548 ​ (242) ​ 712 ​ 11,643 Ending balance ​ 30,442 ​ 4,850 ​ 3,468 ​ 304 ​ 39,064 ​

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Leases
Summary of future minimum lease payments	Below is a summary of undiscounted future minimum lease payments as of December 31, 2020: ​ ​ ​ ​ Years ending December 31, Amount 2021 $ 5,276 2022 4,896 2023 4,529 2024 4,136 2025 3,539 Thereafter 12,294 Total lease payments ​ 34,670 Less: Imputed interest ​ (8,678) Present value of operating lease liabilities $ 25,992

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2020
Premises and Equipment
Schedule of Premises and Equipment	Premises and equipment consisted of the following at December 31, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 December 31, 2019 Land ​ $ 33,149 ​ $ 32,911 Buildings and improvements ​ 92,463 ​ 94,260 Equipment ​ 60,205 ​ 56,523 Total premises and equipment, at cost ​ 185,817 ​ 183,694 Less: accumulated depreciation and amortization ​ (78,835) ​ (71,543) Premises and equipment, net ​ $ 106,982 ​ $ 112,151 ​

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2020
Other Real Estate Owned
Summary of Activity in OREO Balances	A summary of the activity in OREO during 2020 and 2019 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ 2020 ​ 2019 Beginning balance $ 7,300 $ 10,596 Transfers from loan portfolio, at fair value 1,533 ​ 2,705 Impairments (470) ​ (1,082) Sales (3,633) ​ (4,919) Ending balance $ 4,730 ​ $ 7,300

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2020
Summary of gross carrying amount of intangible assets and the associated accumulated amortization	The gross carrying amount of the core deposit intangibles and the associated accumulated amortization at December 31, 2020 and December 31, 2019, are presented as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ December 31, 2019 ​ Gross ​ ​ ​ ​ Net ​ Gross ​ ​ ​ ​ Net ​ carrying ​ Accumulated ​ carrying ​ carrying ​ Accumulated ​ carrying ​ amount ​ amortization ​ amount ​ amount ​ amortization ​ amount Core deposit intangible $ 48,834 $ (41,286) ​ $ 7,548 ​ $ 48,834 $ (40,103) ​ $ 8,731
Summary of changes in the mortgage servicing rights	Below are the changes in the MSRs for the years presented: ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ 2020 ​ 2019 Beginning balance $ 2,630 $ 3,556 Originations ​ 10,354 ​ ​ 27 Impairment ​ (751) ​ ​ (129) Amortization (1,853) ​ (824) Ending balance ​ 10,380 ​ ​ 2,630 Fair value of mortgage servicing rights $ 11,542 ​ $ 2,630
Core Deposits
Summary of estimated future amortization expense for the next five fiscal years	The following table shows the estimated future amortization expense for the core deposit intangibles as of December 31, 2020: ​ ​ ​ ​ Years ending December 31, ​ Amount 2021 $ 1,183 2022 ​ 1,127 2023 ​ 1,048 2024 ​ 1,048 2025 ​ 1,048
MSRs
Summary of estimated future amortization expense for the next five fiscal years	The following table shows the estimated future amortization expense for the MSRs as of December 31, 2020: ​ ​ ​ ​ Years ending December 31, ​ Amount 2021 $ 1,971 2022 ​ 1,626 2023 ​ 1,342 2024 ​ 1,108 2025 ​ 914

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2020
Deposits
Summary of Time Deposits Based Upon Contractual Maturity	​ ​ ​ ​ Years ending December 31, Amount 2021 $ 659,509 2022 ​ 246,835 2023 ​ 47,150 2024 ​ 21,717 2025 9,940 Thereafter 981 Total time deposits $ 986,132
Schedule of Interest Expense on Deposits	The Company incurred interest expense on deposits as follows during the years indicated: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ 2020 2019 2018 Interest bearing demand deposits ​ $ 1,921 ​ $ 1,514 ​ $ 887 Money market accounts ​ 5,342 ​ 9,046 ​ 5,622 Savings accounts ​ 1,342 ​ 2,717 ​ 2,249 Time deposits ​ 15,024 ​ 16,526 ​ 12,283 Total ​ $ 23,629 ​ $ 29,803 ​ $ 21,041

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2020
Borrowings
Schedule of Selected Information Regarding Repurchase Agreements	The following table sets forth selected information regarding repurchase agreements during 2020, 2019 and 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ As of and for the years ended December 31, ​ 2020 2019 2018 Maximum amount of outstanding agreements at any month end during the period $ 54,489 ​ $ 68,600 ​ $ 142,292 Average amount outstanding during the period ​ 30,355 ​ ​ 60,445 ​ ​ 87,691 Weighted average interest rate for the period 0.45% ​ 1.11% ​ 0.34%

Regulatory Capital (Tables)

Regulatory Capital (Tables)	12 Months Ended
	Dec. 31, 2020
Regulatory Capital
Capital Ratio Requirements under Prompt Corrective Action or Other Regulatory Requirements	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ ​ ​ ​ ​ ​ Required to be ​ Required to be ​ ​ ​ ​ ​ ​ ​ well capitalized under ​ considered ​ ​ ​ ​ ​ ​ ​ prompt corrective ​ adequately ​ ​ Actual ​ action provisions ​ capitalized ​ Ratio Amount Ratio Amount Ratio Amount Tier 1 leverage ratio: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated 10.7% ​ $ 696,311 N/A ​ ​ N/A 4.0% ​ $ 260,370 NBH Bank 9.2% ​ 600,622 5.0% ​ $ 325,447 4.0% ​ 260,358 Common equity tier 1 risk based capital: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 14.7% ​ $ 696,311 ​ N/A ​ ​ N/A ​ 7.0% ​ $ 331,632 NBH Bank ​ 12.7% ​ ​ 600,622 ​ 6.5% ​ $ 307,631 ​ 7.0% ​ ​ 331,295 Tier 1 risk based capital ratio: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated 14.7% ​ $ 696,311 N/A ​ ​ N/A 8.5% ​ $ 402,696 NBH Bank 12.7% ​ 600,622 8.0% ​ $ 378,623 8.5% ​ 402,287 Total risk based capital ratio: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated 15.8% ​ $ 749,899 N/A ​ ​ N/A 10.5% ​ $ 497,448 NBH Bank 13.8% ​ 654,209 10.0% ​ $ 473,279 10.5% ​ 496,943 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ ​ ​ ​ ​ ​ Required to be ​ Required to be ​ ​ ​ ​ ​ ​ ​ well capitalized under ​ considered ​ ​ ​ ​ ​ ​ ​ prompt corrective ​ adequately ​ ​ Actual ​ action provisions ​ capitalized ​ Ratio Amount Ratio Amount Ratio Amount Tier 1 leverage ratio: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated 11.0% ​ $ 640,440 N/A ​ ​ N/A 4.0% ​ $ 231,950 NBH Bank 9.1% ​ 528,028 5.0% ​ $ 289,926 4.0% ​ 231,940 Common equity tier 1 risk based capital: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 13.2% ​ $ 640,440 ​ N/A ​ ​ N/A ​ 7.0% ​ $ 405,912 NBH Bank ​ 10.9% ​ ​ 528,028 ​ 6.5% ​ $ 376,903 ​ 7.0% ​ ​ 405,896 Tier 1 risk based capital ratio: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated 13.2% ​ $ 640,440 N/A ​ ​ N/A 8.5% ​ $ 412,620 NBH Bank 10.9% ​ 528,028 8.0% ​ $ 387,701 8.5% ​ 411,932 Total risk based capital ratio: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated 14.1% ​ $ 682,645 N/A ​ ​ N/A 10.5% ​ $ 509,707 NBH Bank 11.8% ​ 570,233 10.0% ​ $ 484,626 10.5% ​ 508,857 ​ ​

Revenue from Contracts with C_2

Revenue from Contracts with Clients (Tables)	12 Months Ended
	Dec. 31, 2020
Revenue from Contracts with Clients
Summary of non-interest income segregated by revenue streams	The following table presents non-interest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, and non-interest expense in-scope of Topic 606 for the years ended December 31, 2020, 2019 and 2018. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ ​ 2020 2019 2018 Non-interest income ​ ​ ​ ​ ​ ​ ​ ​ ​ In-scope of Topic 606: ​ ​ ​ ​ ​ ​ ​ ​ ​ Service charges and other fees ​ $ 16,913 ​ $ 19,720 ​ $ 20,408 Bank card fees ​ ​ 15,446 ​ ​ 14,595 ​ ​ 14,489 Non-interest income (in-scope of Topic 606) ​ ​ 32,359 ​ ​ 34,315 ​ ​ 34,897 Non-interest income (out-of-scope of Topic 606) ​ ​ 107,899 ​ ​ 48,437 ​ ​ 35,878 Total non-interest income ​ $ 140,258 ​ $ 82,752 ​ $ 70,775 Non-interest expense ​ ​ ​ ​ ​ ​ ​ ​ ​ In-scope of Topic 606: ​ ​ ​ ​ ​ ​ ​ ​ ​ Gain on OREO sales, net ​ $ 38 ​ $ 7,193 ​ 488 Total revenue in-scope of Topic 606 ​ $ 32,397 ​ $ 41,508 ​ $ 35,385

Stock-based Compensation and _2

Stock-based Compensation and Benefits (Tables)	12 Months Ended
	Dec. 31, 2020
Stock-based Compensation and Benefits
Schedule of weighted average assumptions using Black-Scholes option-pricing model	Below are the weighted average assumptions used in the Black-Scholes option pricing model to determine fair value of the Company’s stock options granted in 2020, 2019 and 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2020 2019 2018 Weighted average fair value $ 3.37 ​ $ 6.31 ​ $ 7.43 Weighted average risk-free interest rate (1) ​ 0.44% ​ ​ 2.35% ​ ​ 2.69% Expected volatility (2) 25.08% ​ ​ 20.56% ​ ​ 20.75% Expected term (years) (3) 6.04 ​ ​ 6.05 ​ ​ 6.10 Dividend yield (4) 3.44% ​ ​ 2.00% ​ ​ 1.13% (1) The risk-free rate for the expected term of the options was based on the U.S. Treasury yield curve at the date of grant and based on the expected term. (2) Expected volatility was calculated using historical volatility of the Company’s stock price for a period commensurate with the expected term of the options. For periods prior to the third quarter of 2018, expected volatility was calculated using a historical volatility of the Company’s stock price coupled with those of a peer group of eight comparable publicly traded companies for a period commensurate with the expected term of the options. (3) The expected term was estimated to be the average of the contractual vesting term and time to expiration. (4) The dividend yield was calculated in accordance with the Company’s dividend policy at the time of grant. ​
Summary of Option Activity	The Company issued stock options in accordance with the 2014 Plan during 2020. The following table summarizes stock option activity for 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ ​ ​ ​ ​ average ​ ​ ​ ​ ​ ​ ​ Weighted ​ remaining ​ ​ ​ ​ ​ ​ ​ average ​ contractual ​ Aggregate ​ ​ ​ ​ exercise ​ term in ​ intrinsic ​ ​ Options ​ price ​ years ​ value Outstanding at December 31, 2019 657,114 ​ $ 26.69 6.41 ​ $ 5,626 Granted 230,261 ​ 23.25 ​ ​ ​ ​ ​ Exercised ​ (94,007) ​ ​ 19.95 ​ ​ ​ ​ ​ Forfeited (25,239) ​ 30.59 ​ ​ ​ ​ ​ Outstanding at December 31, 2020 768,129 ​ $ 26.35 6.91 ​ ​ 5,224 Options exercisable at December 31, 2020 412,940 ​ ​ 25.64 5.32 ​ ​ 3,101 Options vested and expected to vest 736,774 ​ ​ 26.36 6.82 ​ ​ 5,005
Summary of outstanding stock options	The following table summarizes the Company’s outstanding stock options: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Options outstanding ​ Options exercisable ​ ​ ​ ​ ​ Weighted average ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Number ​ remaining contractual ​ Weighted average ​ Number ​ Weighted average Range of exercise price ​ outstanding ​ life (years) ​ exercise price ​ exercisable ​ exercise price $ 18.00 - 22.99 228,228 3.95 ​ $ 19.25 228,228 ​ $ 19.25 ​ 23.00 - 27.99 219,652 9.24 ​ ​ 23.13 936 ​ ​ 23.75 ​ 28.00 - 32.99 ​ 110,753 ​ 7.18 ​ ​ 32.53 ​ 71,223 ​ ​ 32.64 ​ 33.00 - 37.99 ​ 207,597 ​ 7.54 ​ ​ 34.15 ​ 111,289 ​ ​ 34.12 ​ 38.00 and above 1,899 7.63 ​ ​ 40.36 1,264 ​ ​ 40.36 ​
Summary of Restricted Stock Activity	The following table summarizes restricted stock and performance stock unit activity during 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Weighted ​ ​ Restricted ​ average grant- ​ Performance ​ ​ average grant- ​ ​ stock shares ​ date fair value ​ stock units ​ ​ date fair value Unvested at December 31, 2018 ​ 146,494 ​ $ 28.19 ​ 192,049 ​ $ 26.40 Granted ​ 86,689 ​ ​ 35.05 ​ 60,781 ​ ​ 30.85 Adjustment due to performance ​ — ​ ​ — ​ 22,246 ​ ​ 17.36 Vested ​ (85,266) ​ ​ 25.21 ​ (95,308) ​ ​ 18.02 Forfeited ​ (25,719) ​ ​ 32.68 ​ (20,894) ​ ​ 31.48 Unvested at December 31, 2019 ​ 122,198 ​ ​ 34.19 ​ 158,874 ​ ​ 31.19 Granted ​ 127,400 ​ ​ 23.94 ​ 68,498 ​ ​ 26.74 Adjustment due to performance ​ — ​ ​ — ​ 17,852 ​ ​ 33.22 Vested ​ (69,444) ​ ​ 32.60 ​ (53,540) ​ ​ 33.22 Forfeited ​ (13,524) ​ ​ 29.25 ​ (6,847) ​ ​ 29.52 Unvested at December 31, 2020 ​ 166,630 ​ $ 27.42 ​ 184,837 ​ $ 29.21

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2020
Earnings Per Share
Schedule of Computation of Basic and Diluted Income (Loss) Per Share	The following table illustrates the computation of basic and diluted earnings per share for 2020, 2019 and 2018: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ 2020 2019 2018 Net income ​ $ 88,591 ​ $ 80,365 ​ $ 61,451 Less: income allocated to participating securities ​ (130) ​ (94) ​ (70) Income allocated to common shareholders ​ $ 88,461 ​ $ 80,271 ​ $ 61,381 Weighted average shares outstanding for basic earnings per common share ​ 30,857,086 ​ 31,175,825 ​ 30,748,234 Dilutive effect of equity awards ​ 218,771 ​ 354,992 ​ 681,840 Weighted average shares outstanding for diluted earnings per common share ​ 31,075,857 ​ 31,530,817 ​ 31,430,074 Basic earnings per share ​ $ 2.87 ​ $ 2.57 ​ $ 2.00 Diluted earnings per share ​ ​ 2.85 ​ ​ 2.55 ​ ​ 1.95

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Income Taxes
Components of Income Tax Expense	Total income taxes for 2020, 2019 and 2018 were allocated as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ 2020 2019 2018 Current expense: ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. federal ​ $ 16,460 ​ $ 8,947 ​ $ 427 State and local ​ 3,255 ​ 2,280 ​ 1,530 Total current income tax expense ​ ​ 19,715 ​ ​ 11,227 ​ ​ 1,957 Deferred expense: ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. federal ​ ​ 560 ​ ​ 4,115 ​ ​ 10,110 State and local ​ 531 ​ 487 ​ 163 Total deferred income tax expense ​ 1,091 ​ 4,602 ​ 10,273 Income tax expense ​ $ 20,806 ​ $ 15,829 ​ $ 12,230 ​
Components of Tax Rate Reconciliation	The reconciliation between the income tax expenses and the amounts computed by applying the U.S. federal income tax rate to pretax income is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ 2020 2019 2018 Income tax at federal statutory rates (21%) ​ $ 22,974 ​ $ 20,201 ​ $ 15,473 State income taxes, net of federal benefits ​ 2,991 ​ 2,186 ​ 1,337 Tax-exempt loan interest income ​ (4,628) ​ (4,354) ​ (4,089) Bank-owned life insurance income ​ (575) ​ (475) ​ 136 Stock-based compensation ​ 43 ​ (1,925) ​ (1,207) Other ​ 1 ​ 196 ​ 580 Income tax expense ​ $ 20,806 ​ $ 15,829 ​ $ 12,230 ​
Significant Components of Deferred Taxes	The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2020 and 2019 are presented below: ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 December 31, 2019 Deferred tax assets: ​ ​ ​ ​ ​ Excess tax basis of acquired loans over carrying value $ 966 ​ $ 2,053 Allowance for credit losses 14,154 ​ 9,414 Other real estate owned 634 ​ 810 Accrued stock-based compensation 2,070 ​ 1,945 Accrued compensation 3,674 ​ 3,425 Capitalized start-up costs 1,540 ​ 1,885 Accrued expenses 532 ​ 1,051 Net deferred loan fees 1,015 ​ 63 Net operating loss ​ 641 ​ ​ 707 Lease liability ​ 6,154 ​ ​ 7,113 Other 2,025 ​ 1,910 Total deferred tax assets ​ 33,405 ​ ​ 30,376 Deferred tax liabilities: ​ ​ ​ ​ ​ Intangible assets ​ (2,563) ​ ​ (327) Net unrealized gains on investment securities (3,033) ​ (647) Premises and equipment (1,599) ​ (1,852) Right of use assets ​ (6,015) ​ ​ (7,033) Prepaid expenses ​ (229) ​ ​ (209) Mortgage servicing rights ​ (2,458) ​ ​ (634) Other (44) ​ (196) Total deferred tax liabilities (15,941) ​ (10,898) Net deferred tax asset $ 17,464 ​ $ 19,478 ​

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2020
Derivatives
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	Information about the valuation methods used to measure fair value is provided in note 22. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset derivatives fair value ​ ​ ​ Liability derivatives fair value ​ ​ Balance Sheet ​ December 31, ​ December 31, ​ Balance Sheet ​ December 31, ​ December 31, ​ location 2020 2019 Location 2020 2019 Derivatives designated as hedging instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate products Other assets ​ $ — ​ $ 1,171 Other liabilities ​ $ 38,884 ​ $ 13,537 Total derivatives designated as hedging instruments ​ ​ ​ $ — ​ $ 1,171 ​ ​ ​ $ 38,884 ​ $ 13,537 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives not designated as hedging instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate products Other assets ​ $ 18,149 ​ $ 9,004 Other liabilities ​ $ 18,176 ​ $ 9,021 Interest rate lock commitments ​ Other assets ​ ​ 7,001 ​ ​ 1,499 ​ Other liabilities ​ ​ 298 ​ ​ 141 Forward contracts ​ Other assets ​ ​ — ​ ​ 16 ​ Other liabilities ​ ​ 2,622 ​ ​ 299 Total derivatives not designated as hedging instruments ​ ​ ​ $ 25,150 ​ $ 10,519 ​ ​ ​ $ 21,096 ​ $ 9,461
Derivative Instruments, Gain (Loss)	The tables below present the effect of the Company’s derivative financial instruments on the consolidated statements of operations for 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Location of gain (loss) ​ Amount of gain (loss) recognized in income on derivatives Derivatives in fair value ​ recognized in income on ​ For the years ended December 31, hedging relationships derivatives 2020 2019 Interest rate products Interest and fees on loans ​ $ 4,405 ​ $ 10,397 Total ​ ​ ​ $ 4,405 ​ $ 10,397 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Location of gain (loss) ​ Amount of gain (loss) recognized in income on hedged items ​ ​ recognized in income on ​ For the years ended December 31, Hedged items hedged items 2020 2019 Interest rate products Interest and fees on loans ​ $ (6,376) $ (9,603) Total ​ ​ ​ $ (6,376) $ (9,603) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Location of gain (loss) ​ Amount of gain (loss) recognized in income on derivatives Derivatives not designated ​ recognized in income on ​ For the years ended December 31, as hedging instruments derivatives 2020 2019 Interest rate products Other non-interest expense ​ $ (7) $ 133 Interest rate lock commitments ​ Mortgage banking income ​ ​ 7,218 ​ ​ 1,138 Forward contracts ​ Mortgage banking income ​ ​ (2,339) ​ ​ 189 Total ​ ​ ​ $ 4,872 $ 1,460 ​

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies
Schedule of Total Unfunded Commitments	Total unfunded commitments at December 31, 2020 and 2019 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 December 31, 2019 Commitments to fund loans ​ $ 311,237 ​ $ 249,914 Unfunded commitments under lines of credit ​ 537,325 ​ 600,407 Commercial and standby letters of credit ​ 7,320 ​ 11,929 Total unfunded commitments ​ $ 855,882 ​ $ 862,250
Schedule of Repurchase Reserve	The following table summarizes mortgage repurchase reserve activity for the periods presented: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ ​ 2020 ​ 2019 Beginning balance ​ $ 2,589 ​ $ 3,286 Provision charged to (released from) operating expense, net ​ ​ 662 ​ ​ (366) Charge-offs ​ ​ (510) ​ ​ (331) Ending balance ​ $ 2,741 ​ $ 2,589

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2020
Fair Value Measurements
Tables of Financial Instruments Measured At Fair Value on Recurring Basis	The tables below present the financial instruments measured at fair value on a recurring basis as of December 31, 2020 and 2019, on the consolidated statements of financial condition utilizing the hierarchy structure described above: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Level 1 ​ Level 2 ​ Level 3 ​ Total Assets: ​ ​ ​ ​ Investment securities available-for-sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ — ​ $ 196,334 ​ $ — ​ $ 196,334 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ — ​ 462,779 ​ — ​ 462,779 Municipal securities ​ ​ — ​ ​ 318 ​ ​ — ​ ​ 318 Corporate debt ​ ​ — ​ 1,998 ​ — ​ 1,998 Loans held for sale ​ — ​ 247,813 ​ — ​ 247,813 Interest rate swap derivatives ​ — ​ 18,149 ​ — ​ 18,149 Mortgage banking derivatives ​ ​ — ​ ​ — ​ ​ 7,001 ​ ​ 7,001 Total assets at fair value ​ $ — ​ $ 927,391 ​ $ 7,001 ​ $ 934,392 Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap derivatives ​ $ — ​ $ 57,060 ​ $ — ​ $ 57,060 Mortgage banking derivatives ​ ​ — ​ ​ — ​ ​ 2,920 ​ ​ 2,920 Total liabilities at fair value ​ $ — ​ $ 57,060 ​ $ 2,920 ​ $ 59,980 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ Level 1 Level 2 Level 3 Total Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Investment securities available-for-sale: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage-backed securities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ — ​ $ 95,256 ​ $ — ​ $ 95,256 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ — ​ 542,037 ​ — ​ 542,037 Municipal securities ​ ​ — ​ ​ 372 ​ ​ — ​ ​ 372 Loans held for sale ​ — ​ 117,444 ​ — ​ 117,444 Interest rate swap derivatives ​ — ​ 10,175 ​ — ​ 10,175 Mortgage banking derivatives ​ ​ — ​ ​ — ​ ​ 1,515 ​ ​ 1,515 Total assets at fair value ​ $ — ​ $ 765,284 ​ $ 1,515 ​ $ 766,799 Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap derivatives ​ $ — ​ $ 22,558 ​ $ — ​ $ 22,558 Mortgage banking derivatives ​ ​ — ​ ​ — ​ ​ 440 ​ ​ 440 Total liabilities at fair value ​ $ — ​ $ 22,558 ​ $ 440 ​ $ 22,998
Table of Changes in Level 3 Financial Instruments	The table below details the changes in level 3 financial instruments during 2020: ​ ​ ​ ​ ​ ​ Mortgage banking ​ ​ ​ derivatives, net Balance at December 31, 2019 ​ $ 1,075 Gain included in earnings, net ​ ​ 4,879 Fees and costs included in earnings, net ​ (1,873) Balance at December 31, 2020 ​ $ 4,081
Table of assets recorded at fair value on a non-recurring basis	​ The tables below provide information regarding the assets recorded at fair value on a non-recurring basis at December 31, 2020 and 2019. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Total ​ Losses from fair value changes Individually evaluated loans ​ $ 25,480 ​ $ 3,228 Other real estate owned ​ 4,730 ​ 470 Premises and equipment ​ 8,024 ​ ​ 1,631 Mortgage servicing rights ​ 10,380 ​ 751 Total ​ $ 48,614 ​ $ 6,080 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ ​ Total ​ Losses from fair value changes Individually evaluated loans ​ $ 32,763 ​ $ 8,271 Other real estate owned ​ 7,300 ​ 1,082 Premises and equipment ​ 3,385 ​ ​ 898 Mortgage servicing rights ​ ​ 2,630 ​ ​ 129 Total ​ $ 46,078 ​ $ 10,380

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2020
Fair Value Measurements
Fair Value of Financial Instruments	The fair value of financial instruments at December 31, 2020 and 2019 are set forth below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Level in fair value December 31, 2020 December 31, 2019 ​ ​ measurement ​ Carrying ​ Estimated ​ Carrying ​ Estimated ​ ​ hierarchy ​ amount fair value amount fair value ASSETS ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents Level 1 ​ $ 605,565 ​ $ 605,565 ​ $ 110,190 ​ $ 110,190 Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale Level 2 ​ 196,334 ​ 196,334 ​ 95,256 ​ 95,256 Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises available-for-sale Level 2 ​ 462,779 ​ 462,779 ​ 542,037 ​ 542,037 Municipal securities available-for-sale ​ Level 2 ​ ​ 318 ​ ​ 318 ​ ​ 372 ​ ​ 372 Municipal securities available-for-sale ​ Level 3 ​ ​ 57 ​ ​ 57 ​ ​ 115 ​ ​ 115 Corporate debt ​ Level 2 ​ ​ 1,998 ​ ​ 1,998 ​ ​ — ​ ​ — Other available-for-sale securities Level 3 ​ 469 ​ 469 ​ 469 ​ 469 Mortgage-backed securities—residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity Level 2 ​ 306,187 ​ 310,930 ​ 127,560 ​ 128,770 Mortgage-backed securities—other residential mortgage-backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity Level 2 ​ 70,428 ​ 70,761 ​ 55,324 ​ 54,971 Non-marketable securities ​ Level 2 ​ ​ 16,493 ​ ​ 16,493 ​ ​ 29,751 ​ ​ 29,751 Loans receivable Level 3 ​ 4,353,726 ​ 4,511,357 ​ 4,415,406 ​ 4,481,209 Loans held for sale Level 2 ​ 247,813 ​ 247,813 ​ 117,444 ​ 117,444 Accrued interest receivable Level 2 ​ 18,795 ​ 18,795 ​ 19,157 ​ 19,157 Interest rate swap derivatives Level 2 ​ 18,149 ​ 18,149 ​ 10,175 ​ 10,175 Mortgage banking derivatives ​ Level 3 ​ ​ 7,001 ​ ​ 7,001 ​ ​ 1,515 ​ ​ 1,515 LIABILITIES ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposit transaction accounts Level 2 ​ 4,690,100 ​ 4,690,100 ​ 3,678,979 ​ 3,678,979 Time deposits Level 2 ​ 986,132 ​ 993,070 ​ 1,058,153 ​ 1,058,354 Securities sold under agreements to repurchase Level 2 ​ 22,897 ​ 22,897 ​ 56,935 ​ 56,935 Federal Home Loan Bank advances Level 2 ​ — ​ — ​ 207,675 ​ 207,890 Accrued interest payable Level 2 ​ 6,762 ​ 6,762 ​ 9,328 ​ 9,328 Interest rate swap derivatives ​ Level 2 ​ ​ 57,060 ​ ​ 57,060 ​ 22,558 ​ 22,558 Mortgage banking derivatives Level 3 ​ 2,920 ​ 2,920 ​ ​ 440 ​ ​ 440

Parent Company Only Financial_2

Parent Company Only Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2020
Parent Company Only Financial Statements
Condensed Statements	Parent company only financial information for National Bank Holdings Corporation is summarized as follows: ​ Condensed Statements of Financial Condition ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 December 31, 2019 ASSETS ​ ​ ​ ​ ​ ​ Cash and cash equivalents ​ $ 91,402 ​ $ 105,012 Investment in subsidiaries ​ 725,002 ​ 654,508 Other assets ​ 14,809 ​ 18,095 Total assets ​ $ 831,213 ​ $ 777,615 LIABILITIES AND STOCKHOLDERS’ EQUITY ​ ​ ​ ​ ​ ​ Other liabilities ​ $ 10,522 ​ $ 10,695 Total liabilities ​ 10,522 ​ 10,695 Shareholders’ equity ​ 820,691 ​ 766,920 Total liabilities and shareholders’ equity ​ $ 831,213 ​ $ 777,615 ​ Condensed Statements of Operations ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ 2020 2019 2018 Income ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest income ​ $ — ​ $ — ​ $ 112 Equity in undistributed earnings of subsidiaries ​ 67,416 ​ 28,133 ​ 19,682 Distributions from subsidiaries ​ 27,200 ​ 55,725 ​ 47,338 Total income ​ 94,616 ​ 83,858 ​ 67,132 Expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ Salaries and benefits ​ 5,136 ​ 4,925 ​ 4,455 Other expenses ​ 2,621 ​ 2,463 ​ 4,467 Total expenses ​ 7,757 ​ 7,388 ​ 8,922 Income before income taxes ​ 86,859 ​ 76,470 ​ 58,210 Income tax benefit ​ (1,732) ​ (3,895) ​ (3,241) Net income ​ $ 88,591 ​ $ 80,365 ​ $ 61,451 ​ Condensed Statements of Cash Flows ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the years ended December 31, ​ 2020 2019 2018 Cash flows from operating activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Net income ​ $ 88,591 ​ $ 80,365 ​ $ 61,451 Equity in undistributed earnings of subsidiaries ​ (67,416) ​ (28,133) ​ (19,682) Stock-based compensation expense ​ 5,299 ​ 4,869 ​ 4,420 Net excess tax benefit on stock-based compensation ​ ​ 51 ​ ​ (2,160) ​ ​ (1,286) Other ​ 3,074 ​ 5,045 ​ 9,230 Net cash provided by operating activities ​ 29,599 ​ 59,986 ​ 54,133 Cash flows from investing activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Outlay for business combinations ​ ​ — ​ ​ — ​ ​ (36,189) Net cash used in investing activities ​ — ​ — ​ (36,189) Cash flows from financing activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Issuance of stock under purchase and equity compensation plans ​ (749) ​ (6,229) ​ (772) Proceeds from exercise of stock options ​ ​ 1,832 ​ ​ 2,788 ​ ​ 7,576 Payment of dividends ​ (24,816) ​ (23,530) ​ (16,624) Repurchase of shares ​ (19,476) ​ — ​ — Net cash used in financing activities ​ (43,209) ​ (26,971) ​ (9,820) Net increase in cash, cash equivalents and restricted cash ​ (13,610) ​ 33,015 ​ 8,124 Cash, cash equivalents and restricted cash at beginning of the year ​ 115,012 ​ 81,997 ​ 73,873 Cash, cash equivalents and restricted cash at end of the year ​ $ 101,402 ​ $ 115,012 ​ $ 81,997

Quarterly Results of Operatio_2

Quarterly Results of Operations (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2020
Quarterly Results of Operations (unaudited)
Summary of Quarterly Results	The following is a summary of quarterly results: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ Fourth Third Second First ​ ​ ​ ​ quarter ​ quarter ​ quarter ​ quarter ​ Total Interest and dividend income ​ $ 53,288 ​ $ 52,302 ​ $ 53,744 ​ $ 58,668 ​ $ 218,002 Interest expense ​ 4,732 ​ 5,587 ​ 6,416 ​ 8,321 ​ 25,056 Net interest income before provision for loan losses ​ 48,556 ​ 46,715 ​ 47,328 ​ 50,347 ​ 192,946 Provision for loan losses ​ — ​ 1,200 ​ 10,271 ​ 6,159 ​ 17,630 Net interest income after provision for loan losses ​ 48,556 ​ 45,515 ​ 37,057 ​ 44,188 ​ 175,316 Non-interest income ​ 33,357 ​ 44,532 ​ 38,837 ​ 23,532 ​ 140,258 Non-interest expense ​ 48,425 ​ 55,321 ​ 53,760 ​ 48,671 ​ 206,177 Income before income taxes ​ 33,488 ​ 34,726 ​ 22,134 ​ 19,049 ​ 109,397 Income tax expense ​ 6,319 ​ 6,833 ​ 4,429 ​ 3,225 ​ 20,806 Net income ​ $ 27,169 ​ $ 27,893 ​ $ 17,705 ​ $ 15,824 ​ $ 88,591 Earnings per share-basic ​ $ 0.88 ​ $ 0.91 ​ $ 0.57 ​ $ 0.51 ​ $ 2.87 Earnings per share-diluted ​ ​ 0.87 ​ ​ 0.90 ​ ​ 0.57 ​ ​ 0.50 ​ ​ 2.85 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2019 ​ Fourth Third Second First ​ ​ ​ ​ quarter ​ quarter ​ quarter ​ quarter ​ Total Interest and dividend income ​ $ 59,616 ​ $ 61,372 ​ $ 62,193 ​ $ 59,420 ​ $ 242,601 Interest expense ​ 9,228 ​ 9,587 ​ 9,702 ​ 8,254 ​ 36,771 Net interest income before provision for loan losses ​ 50,388 ​ 51,785 ​ 52,491 ​ 51,166 ​ 205,830 Provision for loan losses ​ 1,180 ​ 5,690 ​ 3,239 ​ 1,534 ​ 11,643 Net interest income after provision for loan losses ​ 49,208 ​ 46,095 ​ 49,252 ​ 49,632 ​ 194,187 Non-interest income ​ 20,282 ​ 24,759 ​ 20,660 ​ 17,051 ​ 82,752 Non-interest expense ​ 46,107 ​ 43,793 ​ 46,451 ​ 44,394 ​ 180,745 Income before income taxes ​ 23,383 ​ 27,061 ​ 23,461 ​ 22,289 ​ 96,194 Income tax expense ​ 3,864 ​ 5,419 ​ 3,179 ​ 3,367 ​ 15,829 Net income ​ $ 19,519 ​ $ 21,642 ​ $ 20,282 ​ $ 18,922 ​ $ 80,365 Earnings per share-basic ​ $ 0.62 ​ $ 0.69 ​ $ 0.65 ​ $ 0.61 ​ $ 2.57 Earnings per share-diluted ​ ​ 0.62 ​ ​ 0.69 ​ ​ 0.64 ​ ​ 0.60 ​ ​ 2.55 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2018 ​ Fourth Third Second First ​ ​ ​ ​ quarter ​ quarter ​ quarter ​ quarter ​ Total Interest and dividend income ​ $ 57,780 ​ $ 55,909 ​ $ 54,911 ​ $ 52,791 ​ $ 221,391 Interest expense ​ 7,148 ​ 6,137 ​ 5,525 ​ 5,144 ​ 23,954 Net interest income before provision for loan losses ​ 50,632 ​ 49,772 ​ 49,386 ​ 47,647 ​ 197,437 Provision for loan losses ​ 2,476 ​ 807 ​ 1,873 ​ 41 ​ 5,197 Net interest income after provision for loan losses ​ 48,156 ​ 48,965 ​ 47,513 ​ 47,606 ​ 192,240 Non-interest income ​ 15,317 ​ 18,061 ​ 19,562 ​ 17,835 ​ 70,775 Non-interest expense ​ 42,857 ​ 44,432 ​ 46,763 ​ 55,282 ​ 189,334 Income before income taxes ​ 20,616 ​ 22,594 ​ 20,312 ​ 10,159 ​ 73,681 Income tax expense (benefit) ​ 3,381 ​ 4,354 ​ 2,800 ​ 1,695 ​ 12,230 Net income ​ $ 17,235 ​ $ 18,240 ​ $ 17,512 ​ $ 8,464 ​ $ 61,451 Earnings per share-basic ​ $ 0.56 ​ $ 0.59 ​ $ 0.57 ​ $ 0.28 ​ $ 2.00 Earnings per share-diluted ​ ​ 0.55 ​ ​ 0.58 ​ ​ 0.56 ​ ​ 0.27 ​ ​ 1.95

Acquisition Activities (Tables)

Acquisition Activities (Tables)	12 Months Ended
	Dec. 31, 2020
Acquisition Activities
Net Assets acquired (at fair value) and consideration transferred	The table below summarizes the net assets acquired (at fair value) and consideration transferred in connection with the Peoples acquisition: ​ ​ ​ ​ ​ ​ ​ January 1, 2018 Assets: ​ ​ ​ Cash and due from banks ​ $ 105,173 Investment securities available-for-sale ​ ​ 118,512 Non-marketable securities ​ ​ 4,796 Loans ​ ​ 542,707 Loans held for sale ​ ​ 54,260 Other real estate owned ​ ​ 1,253 Premises and equipment ​ ​ 18,584 Core deposit intangible asset ​ ​ 10,477 Mortgage servicing rights ​ ​ 4,301 Other assets ​ ​ 15,361 Total assets acquired ​ ​ 875,424 ​ ​ ​ ​ Liabilities: ​ ​ ​ Total deposits ​ ​ 729,911 FHLB borrowings ​ ​ 33,825 Other liabilities ​ ​ 20,683 Total liabilities assumed ​ ​ 784,419 ​ ​ ​ ​ Identifiable net assets acquired ​ $ 91,005 ​ ​ ​ ​ Consideration: ​ ​ ​ NBHC common stock paid at January 1, 2018, closing price of $32.43 ​ $ 110,213 Cash ​ ​ 36,189 Total ​ ​ 146,402 ​ ​ ​ ​ Goodwill ​ $ 55,397

Basis of Presentation (Details)

Basis of Presentation (Details)	12 Months Ended
	Dec. 31, 2020item
Basis of Presentation
Number of full service banking offices	90

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2020loan
Significant Accounting Policies [Line Items]
Residential mortgage loans held for sale period	45 days
Number of primary loan segment	4
Number of loan classes	11
Buildings [Member]
Significant Accounting Policies [Line Items]
Estimated useful life of the asset	39 years
Maximum
Significant Accounting Policies [Line Items]
Fair values are subject to refinement maximum year	1 year
Maximum | COVID-19
Significant Accounting Policies [Line Items]
Deferral period	1 year
Maximum | Stock options [Member]
Significant Accounting Policies [Line Items]
Contractual term	10 years
Maximum | Building Improvements [Member]
Significant Accounting Policies [Line Items]
Estimated useful life of the asset	15 years
Maximum | Equipment [Member]
Significant Accounting Policies [Line Items]
Estimated useful life of the asset	7 years
Minimum | COVID-19
Significant Accounting Policies [Line Items]
Deferral period	3 months
Minimum | Building Improvements [Member]
Significant Accounting Policies [Line Items]
Estimated useful life of the asset	7 years
Minimum | Equipment [Member]
Significant Accounting Policies [Line Items]
Estimated useful life of the asset	3 years

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity		$ 820,691		$ 766,920		$ 695,006	$ 532,407
Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity		$ 4,623		$ (256)		26
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance for credit losses			$ 5,800
Increase in allowance for credit losses net of tax			4,600
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment [Member] | Mortgage-Backed Securities (MBS) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in allowance for credit losses net of tax			$ 0
ASU 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of certain tax effects from accumulated other comprehensive income	$ 1,500
Adjustments for New Accounting Principle, Early Adoption [Member] | ASU 2016-02 and ASU 2018-11 | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease right-of-use assets					$ 30,500
Lease liabilities					30,500
Stockholders' equity					$ 300
Adjustments for New Accounting Principle, Early Adoption [Member] | ASU 2017-12 | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity						$ 26

Investment Securities - Narrati

Investment Securities - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)security	Dec. 31, 2019USD ($)security	Dec. 31, 2018USD ($)
Investment securities total	$ 1,000,000	$ 800,000
Amortized cost	650,600	638,009
Available-for-sale securities	661,955	638,249
Held-to-maturity securities	376,615	182,884
Purchases of available-for-sale securities	286,130	45,745	$ 72,555
Maturities and paydowns of available-for-sale securities	271,508	195,467	216,077
Sales of available-for-sale securities	$ 0	$ 20,378	33,637
Number of securities | security	22	67
Fair value of available-for-sale securities in an unrealized loss position	$ 126,903	$ 308,569
Fair value of collateral	0	13,600
Fair value of available-for-sale investment securities pledged as collateral	$ 385,800	$ 352,300
Type of available-for-sale investment securities collateral	us-gaap:AssetPledgedAsCollateralMember	us-gaap:AssetPledgedAsCollateralMember
Purchases of held-to-maturity securities	$ 284,170	$ 10,201	40,735
Maturities and paydowns of held-to-maturity securities	$ 88,071	$ 60,948	$ 61,913
Number of held-to-maturity securities in unrealized loss positions | security	9	13
Fair value of held-to-maturity securities in an unrealized loss position	$ 73,007	$ 43,295
Held-to-maturity investment securities pledged as collateral	140,600	144,200
Held-to-maturity investment securities held as collateral	0	4,000
Investment Securities Available-For-Sale [Member]
Accrued interest receivable	1,100	1,300
Held-to-maturity Securities [Member]
Accrued interest receivable	700	500
Municipal securities maturing with in one year [Member]
Amortized cost	100
Available-for-sale securities	100
Municipal securities maturing within one to five years [Member]
Amortized cost	300
Available-for-sale securities	300
Corporate debt securities due after five to ten years [Member]
Amortized cost	2,000
Available-for-sale securities	2,000
Other Securities Investments with No Contractual Maturity [Member]
Amortized cost	500
Other Securities [Member]
Amortized cost	469	469
Available-for-sale securities	$ 469	$ 469

Investment Securities - Summary

Investment Securities - Summary of Available-for-Sale Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 650,600	$ 638,009
Gross unrealized gains	11,743	5,315
Gross unrealized losses	(388)	(5,075)
Investment securities available-for-sale (at fair value)	661,955	638,249
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	193,424	93,770
Gross unrealized gains	2,952	1,497
Gross unrealized losses	(42)	(11)
Investment securities available-for-sale (at fair value)	196,334	95,256
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	454,345	543,275
Gross unrealized gains	8,778	3,818
Gross unrealized losses	(344)	(5,056)
Investment securities available-for-sale (at fair value)	462,779	542,037
Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	362	495
Gross unrealized gains	13
Gross unrealized losses		(8)
Investment securities available-for-sale (at fair value)	375	487
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	2,000
Gross unrealized losses	(2)
Investment securities available-for-sale (at fair value)	1,998
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	469	469
Investment securities available-for-sale (at fair value)	$ 469	$ 469

Investment Securities - Summa_2

Investment Securities - Summary of Unrealized Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	$ 124,764	$ 52,396
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(372)	(288)
12 months or more, Fair Value	2,139	256,173
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(16)	(4,787)
Total, Fair Value	126,903	308,569
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(388)	(5,075)
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	26,878	10,413
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(42)	(7)
12 months or more, Fair Value	1	1,421
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(4)
Total, Fair Value	26,879	11,834
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(42)	(11)
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	95,888	41,983
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(328)	(281)
12 months or more, Fair Value	2,138	254,380
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(16)	(4,775)
Total, Fair Value	98,026	296,363
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(344)	(5,056)
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	1,998
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2)
Total, Fair Value	1,998
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (2)
Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
12 months or more, Fair Value		372
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(8)
Total, Fair Value		372
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ (8)

Investment Securities - Summa_3

Investment Securities - Summary of Held-to-maturity Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities	$ 376,615	$ 182,884
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	5,336	1,321
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(260)	(464)
Fair value	381,691	183,741
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities	306,187	127,560
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	4,940	1,239
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(197)	(29)
Fair value	310,930	128,770
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities	70,428	55,324
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	396	82
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(63)	(435)
Fair value	$ 70,761	$ 54,971

Investment Securities - Summa_4

Investment Securities - Summary of Held-to-Maturity Securities, Unrealized Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Fair Value, Less than 12 months	$ 73,007	$ 14,403
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(260)	(35)
Fair Value, 12 months or more		28,892
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(429)
Total Fair Value	73,007	43,295
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(260)	(464)
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Fair Value, Less than 12 months	53,453	10,478
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(197)	(26)
Fair Value, 12 months or more		338
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(3)
Total Fair Value	53,453	10,816
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(197)	(29)
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Schedule of Held-to-maturity Securities [Line Items]
Fair Value, Less than 12 months	19,554	3,925
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(63)	(9)
Fair Value, 12 months or more		28,554
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(426)
Total Fair Value	19,554	32,479
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (63)	$ (435)

Non-Marketable Securities - Nar

Non-Marketable Securities - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Schedule of Cost-method Investments [Line Items]
Federal Reserve Bank stock	$ 13.9	$ 13.9
FHLB Des Moines Stock [Member]
Schedule of Cost-method Investments [Line Items]
FHLB Stock	$ 2.6	$ 15.8

Loans - Loan Portfolio Composit

Loans - Loan Portfolio Composition Including Carrying Value by Segment of Loans Accounted for under ASC Topic 310-30 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Loans [Line Items]
Fees and cost related to loans	$ 16,200	$ 21,900
Total Loans	$ 4,353,726	$ 4,415,406
% of Total	100.00%	100.00%
Commercial Portfolio Segment [Member]
Loans [Line Items]
Total Loans	$ 3,044,065	$ 2,992,307
% of Total	70.00%	67.80%
Commercial Portfolio Segment [Member] | Paycheck Protection Program Loans [Member]
Loans [Line Items]
Fees and cost related to loans	$ 176,100
Commercial Real Estate Portfolio Segment [Member]
Loans [Line Items]
Total Loans	$ 631,996	$ 630,906
% of Total	14.50%	14.30%
Residential Portfolio Segment [Member]
Loans [Line Items]
Total Loans	$ 658,659	$ 770,417
% of Total	15.10%	17.40%
Consumer Loan [Member]
Loans [Line Items]
Total Loans	$ 19,006	$ 21,776
% of Total	0.40%	0.50%

Loans - Loan Delinquency (Detai

Loans - Loan Delinquency (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loans [Line Items]
Non- accrual loans	$ 20,387	$ 21,748
Total past due and non-accrual	21,517	29,759
Current	4,332,209	4,385,647
Total	4,353,726	4,415,406
Non-accrual loans with a related allowance	13,884
Non-accrual loans with no related allowance	6,503
Interest income recognized non-accrual	0	0
Commercial Portfolio Segment [Member]
Loans [Line Items]
Non- accrual loans	12,184	12,911
Total past due and non-accrual	12,500	17,682
Current	3,031,565	2,974,625
Total	3,044,065	2,992,307
Non-accrual loans with a related allowance	8,866	7,691	$ 6,641
Non-accrual loans with no related allowance	3,318
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Non- accrual loans	6,312	10,330
Total past due and non-accrual	6,482	13,460
Current	1,440,256	1,398,071
Total	1,446,738	1,411,531
Non-accrual loans with a related allowance	6,080	6,435	4,627
Non-accrual loans with no related allowance	232
Commercial Portfolio Segment [Member] | Municipal [Member]
Loans [Line Items]
Total past due and non-accrual		226
Current	870,791	837,300
Total	870,791	837,526
Commercial Portfolio Segment [Member] | Owner-Occupied [Member]
Loans [Line Items]
Non- accrual loans	5,450	2,264
Total past due and non-accrual	5,450	3,489
Current	510,789	486,633
Total	516,239	490,122
Non-accrual loans with a related allowance	2,698	505	1,169
Non-accrual loans with no related allowance	2,752
Commercial Portfolio Segment [Member] | Food and Agriculture [Member]
Loans [Line Items]
Non- accrual loans	422	317
Total past due and non-accrual	568	507
Current	209,729	252,621
Total	210,297	253,128
Non-accrual loans with a related allowance	88	751	845
Non-accrual loans with no related allowance	334
Commercial Portfolio Segment [Member] | Multifamily [Member]
Loans [Line Items]
Total		837,526
Commercial Real Estate Portfolio Segment [Member]
Loans [Line Items]
Non- accrual loans	1,664	459
Total past due and non-accrual	1,664	1,149
Current	630,332	629,757
Total	631,996	630,906
Non-accrual loans with a related allowance	141	171	254
Non-accrual loans with no related allowance	1,523
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans [Line Items]
Current	91,125	77,733
Total	91,125	77,733
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Non- accrual loans	6	416
Total past due and non-accrual	6	603
Current	24,665	26,276
Total	24,671	26,879
Non-accrual loans with a related allowance	6
Commercial Real Estate Portfolio Segment [Member] | Multifamily [Member]
Loans [Line Items]
Non- accrual loans	1,523
Total past due and non-accrual	1,523
Current	67,233	55,808
Total	68,756	55,808
Non-accrual loans with no related allowance	1,523
Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Non- accrual loans	135	43
Total past due and non-accrual	135	546
Current	447,309	469,940
Total	447,444	470,486
Non-accrual loans with a related allowance	135	171	254
Residential Portfolio Segment [Member]
Loans [Line Items]
Non- accrual loans	6,529	8,328
Total past due and non-accrual	7,311	10,762
Current	651,348	759,655
Total	658,659	770,417
Non-accrual loans with a related allowance	4,867	6,021	6,471
Non-accrual loans with no related allowance	1,662
Residential Portfolio Segment [Member] | Senior lien
Loans [Line Items]
Non- accrual loans	5,820	7,597
Total past due and non-accrual	6,507	9,707
Current	577,764	668,955
Total	584,271	678,662
Non-accrual loans with a related allowance	4,158	5,034	5,178
Non-accrual loans with no related allowance	1,662
Residential Portfolio Segment [Member] | Junior lien
Loans [Line Items]
Non- accrual loans	709	731
Total past due and non-accrual	804	1,055
Current	73,584	90,700
Total	74,388	91,755
Non-accrual loans with a related allowance	709	987	$ 1,293
Consumer Loan [Member]
Loans [Line Items]
Non- accrual loans	10	50
Total past due and non-accrual	42	166
Current	18,964	21,610
Total	19,006	21,776
Non-accrual loans with a related allowance	10
30-89 Days Past Due
Loans [Line Items]
Past due loans	968	6,349
30-89 Days Past Due | Commercial Portfolio Segment [Member]
Loans [Line Items]
Past due loans	316	3,262
30-89 Days Past Due | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Past due loans	170	2,251
30-89 Days Past Due | Commercial Portfolio Segment [Member] | Municipal [Member]
Loans [Line Items]
Past due loans		226
30-89 Days Past Due | Commercial Portfolio Segment [Member] | Owner-Occupied [Member]
Loans [Line Items]
Past due loans		595
30-89 Days Past Due | Commercial Portfolio Segment [Member] | Food and Agriculture [Member]
Loans [Line Items]
Past due loans	146	190
30-89 Days Past Due | Commercial Real Estate Portfolio Segment [Member]
Loans [Line Items]
Past due loans		625
30-89 Days Past Due | Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Past due loans		187
30-89 Days Past Due | Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Past due loans		438
30-89 Days Past Due | Residential Portfolio Segment [Member]
Loans [Line Items]
Past due loans	622	2,346
30-89 Days Past Due | Residential Portfolio Segment [Member] | Senior lien
Loans [Line Items]
Past due loans	527	2,101
30-89 Days Past Due | Residential Portfolio Segment [Member] | Junior lien
Loans [Line Items]
Past due loans	95	245
30-89 Days Past Due | Consumer Loan [Member]
Loans [Line Items]
Past due loans	30	116
Greater than 90 Days Past Due
Loans [Line Items]
Past due loans	162	1,662
Greater than 90 Days Past Due | Commercial Portfolio Segment [Member]
Loans [Line Items]
Past due loans		1,509
Greater than 90 Days Past Due | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Past due loans		879
Greater than 90 Days Past Due | Commercial Portfolio Segment [Member] | Owner-Occupied [Member]
Loans [Line Items]
Past due loans		630
Greater than 90 Days Past Due | Commercial Real Estate Portfolio Segment [Member]
Loans [Line Items]
Past due loans		65
Greater than 90 Days Past Due | Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Past due loans		65
Greater than 90 Days Past Due | Residential Portfolio Segment [Member]
Loans [Line Items]
Past due loans	160	88
Greater than 90 Days Past Due | Residential Portfolio Segment [Member] | Senior lien
Loans [Line Items]
Past due loans	160	9
Greater than 90 Days Past Due | Residential Portfolio Segment [Member] | Junior lien
Loans [Line Items]
Past due loans		$ 79
Greater than 90 Days Past Due | Consumer Loan [Member]
Loans [Line Items]
Past due loans	$ 2

Loans - Carrying Value of Loan

Loans - Carrying Value of Loan Portfolio by Segment and Credit Quality Indicator (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 878,686
2019		$ 676,480
2018			$ 535,198
2017				$ 502,672
2016					$ 334,510
Prior	718,424
Revolving Loans Amortized Cost Basis	702,050
Revolving Loans Converted to Term	5,706
Total	4,353,726	4,415,406
Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		4,287,277
Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		85,734
Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		40,647
Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		1,748
Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	634,536
2019		428,473
2018			442,905
2017				328,709
2016					190,831
Prior	402,951
Revolving Loans Amortized Cost Basis	613,065
Revolving Loans Converted to Term	2,595
Total	3,044,065	2,992,307
Commercial Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		2,893,228
Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		69,620
Commercial Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		27,711
Commercial Portfolio Segment [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		1,748
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	372,064
2019		215,071
2018			198,093
2017				111,008
2016					21,011
Prior	24,040
Revolving Loans Amortized Cost Basis	502,982
Revolving Loans Converted to Term	2,469
Total	1,446,738	1,411,531
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	372,041
2019		212,388
2018			189,753
2017				93,822
2016					15,145
Prior	17,662
Revolving Loans Amortized Cost Basis	499,283
Revolving Loans Converted to Term	991
Total	1,401,085	1,366,457
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2019		1,445
2018			7,381
2017				4,845
2016					5,810
Prior	729
Revolving Loans Amortized Cost Basis	2,329
Revolving Loans Converted to Term	1,478
Total	24,017	28,226
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	23
2019		1,238
2018			925
2017				11,885
2016					56
Prior	4,840
Revolving Loans Amortized Cost Basis	1,341
Total	20,308	15,132
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2018			34
2017				456
Prior	809
Revolving Loans Amortized Cost Basis	29
Total	1,328	1,716
Commercial Portfolio Segment [Member] | Owner-Occupied [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	102,372
2019		112,293
2018			99,323
2017				53,926
2016					35,995
Prior	110,929
Revolving Loans Amortized Cost Basis	1,401
Total	516,239	490,122
Commercial Portfolio Segment [Member] | Owner-Occupied [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	100,791
2019		107,558
2018			90,398
2017				53,131
2016					32,648
Prior	87,758
Revolving Loans Amortized Cost Basis	1,401
Total	473,685	439,315
Commercial Portfolio Segment [Member] | Owner-Occupied [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,581
2019		2,236
2018			2,714
2017				544
2016					3,254
Prior	19,341
Total	29,670	39,986
Commercial Portfolio Segment [Member] | Owner-Occupied [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2019		1,988
2018			6,211
2017				251
2016					93
Prior	3,802
Total	12,345	10,821
Commercial Portfolio Segment [Member] | Owner-Occupied [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2019		511
Prior	28
Total	539
Commercial Portfolio Segment [Member] | Food and Agriculture [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	28,139
2019		9,198
2018			20,242
2017				7,500
2016					9,556
Prior	29,529
Revolving Loans Amortized Cost Basis	106,007
Revolving Loans Converted to Term	126
Total	210,297	253,128
Commercial Portfolio Segment [Member] | Food and Agriculture [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	28,139
2019		9,198
2018			20,242
2017				7,198
2016					9,556
Prior	28,330
Revolving Loans Amortized Cost Basis	106,007
Revolving Loans Converted to Term	126
Total	208,796	249,930
Commercial Portfolio Segment [Member] | Food and Agriculture [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	222
Total	222	1,408
Commercial Portfolio Segment [Member] | Food and Agriculture [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2017				302
Prior	977
Total	1,279	1,758
Commercial Portfolio Segment [Member] | Food and Agriculture [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		32
Commercial Portfolio Segment [Member] | Municipal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	131,961
2019		91,911
2018			125,247
2017				156,275
2016					124,269
Prior	238,453
Revolving Loans Amortized Cost Basis	2,675
Total	870,791	837,526
Commercial Portfolio Segment [Member] | Municipal [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	131,961
2019		91,911
2018			125,247
2017				156,275
2016					124,269
Prior	238,453
Revolving Loans Amortized Cost Basis	2,675
Total	870,791
Commercial Portfolio Segment [Member] | Multifamily [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		837,526
Commercial Portfolio Segment [Member] | Multifamily [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		837,526
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	101,248
2019		163,008
2018			51,415
2017				122,403
2016					53,159
Prior	133,113
Revolving Loans Amortized Cost Basis	5,200
Revolving Loans Converted to Term	2,450
Total	631,996	630,906
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		613,332
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		15,307
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		2,267
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	16,233
2019		49,658
2018			17,349
2017				4,072
Revolving Loans Amortized Cost Basis	2,006
Revolving Loans Converted to Term	1,807
Total	91,125	77,733
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	15,841
2019		49,658
2018			17,349
2017				4,072
Revolving Loans Amortized Cost Basis	2,006
Revolving Loans Converted to Term	1,807
Total	90,733
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	392
Total	392
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,762
2019		1,997
2018			1,947
2017				8,407
2016					4,559
Prior	3,988
Revolving Loans Amortized Cost Basis	11
Total	24,671	26,879
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,762
2019		1,997
2018			1,947
2017				8,373
2016					4,559
Prior	3,694
Revolving Loans Amortized Cost Basis	11
Total	24,343	26,229
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2017				34
Prior	253
Total	287
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	41
Total	41	650
Commercial Real Estate Portfolio Segment [Member] | Multifamily [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	29,738
2019		13,670
2018			137
2017				212
2016					18,050
Prior	6,949
Total	68,756	55,808
Commercial Real Estate Portfolio Segment [Member] | Multifamily [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	29,738
2019		13,670
2018			137
2017				212
2016					18,050
Prior	4,990
Total	66,797	55,325
Commercial Real Estate Portfolio Segment [Member] | Multifamily [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	436
Total	436
Commercial Real Estate Portfolio Segment [Member] | Multifamily [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	1,523
Total	1,523	483
Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	51,515
2019		97,683
2018			31,982
2017				109,712
2016					30,550
Prior	122,176
Revolving Loans Amortized Cost Basis	3,183
Revolving Loans Converted to Term	643
Total	447,444	470,486
Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	51,445
2019		92,225
2018			25,362
2017				86,975
2016					26,613
Prior	118,144
Revolving Loans Amortized Cost Basis	3,083
Revolving Loans Converted to Term	643
Total	404,490	454,045
Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	70
2019		5,458
2018			5,841
2017				22,737
Prior	3,662
Revolving Loans Amortized Cost Basis	100
Total	37,868	15,307
Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2018			779
2016					3,937
Prior	370
Total	5,086	1,134
Residential Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	133,125
2019		81,651
2018			39,167
2017				51,071
2016					90,189
Prior	181,729
Revolving Loans Amortized Cost Basis	81,085
Revolving Loans Converted to Term	642
Total	658,659	770,417
Residential Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		758,992
Residential Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		806
Residential Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		10,619
Residential Portfolio Segment [Member] | Senior lien
Financing Receivable, Credit Quality Indicator [Line Items]
2020	129,646
2019		77,322
2018			36,513
2017				49,119
2016					88,908
Prior	177,661
Revolving Loans Amortized Cost Basis	24,884
Revolving Loans Converted to Term	218
Total	584,271	678,662
Residential Portfolio Segment [Member] | Senior lien | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	129,551
2019		76,504
2018			36,493
2017				47,887
2016					88,358
Prior	173,091
Revolving Loans Amortized Cost Basis	24,884
Revolving Loans Converted to Term	218
Total	576,986	668,452
Residential Portfolio Segment [Member] | Senior lien | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	463
Total	463	441
Residential Portfolio Segment [Member] | Senior lien | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	95
2019		818
2018			20
2017				1,232
2016					550
Prior	4,107
Total	6,822	9,769
Residential Portfolio Segment [Member] | Junior lien
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,479
2019		4,329
2018			2,654
2017				1,952
2016					1,281
Prior	4,068
Revolving Loans Amortized Cost Basis	56,201
Revolving Loans Converted to Term	424
Total	74,388	91,755
Residential Portfolio Segment [Member] | Junior lien | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,479
2019		4,217
2018			2,553
2017				1,775
2016					1,226
Prior	3,760
Revolving Loans Amortized Cost Basis	55,860
Revolving Loans Converted to Term	365
Total	73,235	90,540
Residential Portfolio Segment [Member] | Junior lien | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	21
Revolving Loans Amortized Cost Basis	341
Total	362	365
Residential Portfolio Segment [Member] | Junior lien | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2019		112
2018			101
2017				177
2016					55
Prior	287
Revolving Loans Converted to Term	59
Total	791	850
Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	9,777
2019		3,348
2018			1,711
2017				489
2016					331
Prior	631
Revolving Loans Amortized Cost Basis	2,700
Revolving Loans Converted to Term	19
Total	19,006	21,776
Consumer Loan [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	9,777
2019		3,348
2018			1,674
2017				$ 489
2016					329
Prior	623
Revolving Loans Amortized Cost Basis	2,700
Revolving Loans Converted to Term	19
Total	18,959	21,725
Consumer Loan [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total		1
Consumer Loan [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2018			$ 37
2016					$ 2
Prior	8
Total	$ 47	$ 50

Loans - Credit Exposure for Loa

Loans - Credit Exposure for Loans as Determined by Company's Internal Risk Rating System (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans [Line Items]
Total Loans	$ 4,353,726	$ 4,415,406
Pass [Member]
Loans [Line Items]
Total Loans		4,287,277
Special Mention [Member]
Loans [Line Items]
Total Loans		85,734
Substandard [Member]
Loans [Line Items]
Total Loans		40,647
Doubtful [Member]
Loans [Line Items]
Total Loans		1,748
Commercial Portfolio Segment [Member]
Loans [Line Items]
Total Loans	3,044,065	2,992,307
Commercial Portfolio Segment [Member] | Pass [Member]
Loans [Line Items]
Total Loans		2,893,228
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans		69,620
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans [Line Items]
Total Loans		27,711
Commercial Portfolio Segment [Member] | Doubtful [Member]
Loans [Line Items]
Total Loans		1,748
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Total Loans	1,446,738	1,411,531
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Pass [Member]
Loans [Line Items]
Total Loans	1,401,085	1,366,457
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans	24,017	28,226
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Substandard [Member]
Loans [Line Items]
Total Loans	20,308	15,132
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Doubtful [Member]
Loans [Line Items]
Total Loans	1,328	1,716
Commercial Portfolio Segment [Member] | Owner-Occupied [Member]
Loans [Line Items]
Total Loans	516,239	490,122
Commercial Portfolio Segment [Member] | Owner-Occupied [Member] | Pass [Member]
Loans [Line Items]
Total Loans	473,685	439,315
Commercial Portfolio Segment [Member] | Owner-Occupied [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans	29,670	39,986
Commercial Portfolio Segment [Member] | Owner-Occupied [Member] | Substandard [Member]
Loans [Line Items]
Total Loans	12,345	10,821
Commercial Portfolio Segment [Member] | Owner-Occupied [Member] | Doubtful [Member]
Loans [Line Items]
Total Loans	539
Commercial Portfolio Segment [Member] | Food and Agriculture [Member]
Loans [Line Items]
Total Loans	210,297	253,128
Commercial Portfolio Segment [Member] | Food and Agriculture [Member] | Pass [Member]
Loans [Line Items]
Total Loans	208,796	249,930
Commercial Portfolio Segment [Member] | Food and Agriculture [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans	222	1,408
Commercial Portfolio Segment [Member] | Food and Agriculture [Member] | Substandard [Member]
Loans [Line Items]
Total Loans	1,279	1,758
Commercial Portfolio Segment [Member] | Food and Agriculture [Member] | Doubtful [Member]
Loans [Line Items]
Total Loans		32
Commercial Portfolio Segment [Member] | Multifamily [Member]
Loans [Line Items]
Total Loans		837,526
Commercial Portfolio Segment [Member] | Multifamily [Member] | Pass [Member]
Loans [Line Items]
Total Loans		837,526
Commercial Real Estate Portfolio Segment [Member]
Loans [Line Items]
Total Loans	631,996	630,906
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans [Line Items]
Total Loans		613,332
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans		15,307
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans [Line Items]
Total Loans		2,267
Commercial Real Estate Portfolio Segment [Member] | Commercial Construction [Member]
Loans [Line Items]
Total Loans		77,733
Commercial Real Estate Portfolio Segment [Member] | Commercial Construction [Member] | Pass [Member]
Loans [Line Items]
Total Loans		77,733
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Total Loans	24,671	26,879
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member] | Pass [Member]
Loans [Line Items]
Total Loans	24,343	26,229
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans	287
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member] | Substandard [Member]
Loans [Line Items]
Total Loans	41	650
Commercial Real Estate Portfolio Segment [Member] | Multifamily [Member]
Loans [Line Items]
Total Loans	68,756	55,808
Commercial Real Estate Portfolio Segment [Member] | Multifamily [Member] | Pass [Member]
Loans [Line Items]
Total Loans	66,797	55,325
Commercial Real Estate Portfolio Segment [Member] | Multifamily [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans	436
Commercial Real Estate Portfolio Segment [Member] | Multifamily [Member] | Substandard [Member]
Loans [Line Items]
Total Loans	1,523	483
Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Total Loans	447,444	470,486
Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member] | Pass [Member]
Loans [Line Items]
Total Loans	404,490	454,045
Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans	37,868	15,307
Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member] | Substandard [Member]
Loans [Line Items]
Total Loans	5,086	1,134
Residential Portfolio Segment [Member]
Loans [Line Items]
Total Loans	658,659	770,417
Residential Portfolio Segment [Member] | Pass [Member]
Loans [Line Items]
Total Loans		758,992
Residential Portfolio Segment [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans		806
Residential Portfolio Segment [Member] | Substandard [Member]
Loans [Line Items]
Total Loans		10,619
Residential Portfolio Segment [Member] | Senior lien
Loans [Line Items]
Total Loans	584,271	678,662
Residential Portfolio Segment [Member] | Senior lien | Pass [Member]
Loans [Line Items]
Total Loans	576,986	668,452
Residential Portfolio Segment [Member] | Senior lien | Special Mention [Member]
Loans [Line Items]
Total Loans	463	441
Residential Portfolio Segment [Member] | Senior lien | Substandard [Member]
Loans [Line Items]
Total Loans	6,822	9,769
Residential Portfolio Segment [Member] | Junior lien
Loans [Line Items]
Total Loans	74,388	91,755
Residential Portfolio Segment [Member] | Junior lien | Pass [Member]
Loans [Line Items]
Total Loans	73,235	90,540
Residential Portfolio Segment [Member] | Junior lien | Special Mention [Member]
Loans [Line Items]
Total Loans	362	365
Residential Portfolio Segment [Member] | Junior lien | Substandard [Member]
Loans [Line Items]
Total Loans	791	850
Consumer Loan [Member]
Loans [Line Items]
Total Loans	19,006	21,776
Consumer Loan [Member] | Pass [Member]
Loans [Line Items]
Total Loans	18,959	21,725
Consumer Loan [Member] | Special Mention [Member]
Loans [Line Items]
Total Loans		1
Consumer Loan [Member] | Substandard [Member]
Loans [Line Items]
Total Loans	$ 47	$ 50

Loans - Additional Information

Loans - Additional Information Regarding Impaired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loans [Line Items]
Non-accrual loans with a related allowance	$ 13,884
Unpaid principal balance, Total		$ 48,355	$ 42,726
Recorded investment of impaired loans		32,763	31,079
Recorded investment of accruing TDRs		6,900	4,100
Allowance for losses allocated		1,795	1,169
Repurchase reserve	59,777	39,064	35,692
Impaired Loans With No Related Allowance Recorded
Loans [Line Items]
Unpaid principal balance with no related allowance recorded		26,005	25,476
Recorded investment with no related allowance recorded		18,880	17,713
Impaired Loans With Related Allowance Recorded
Loans [Line Items]
Unpaid principal balance of impaired loans with an allowance recorded		22,350	17,250
Non-accrual loans with a related allowance		13,883	13,366
Allowance for loan losses allocated with an allowance recorded		1,795	1,169
Commercial Portfolio Segment [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded		20,734	18,338
Recorded investment with no related allowance recorded		14,153	11,640
Unpaid principal balance of impaired loans with an allowance recorded		15,236	9,497
Non-accrual loans with a related allowance	8,866	7,691	6,641
Allowance for loan losses allocated with an allowance recorded		1,763	1,132
Repurchase reserve	30,376	30,442	27,137
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded		16,001	9,740
Recorded investment with no related allowance recorded		10,548	3,771
Unpaid principal balance of impaired loans with an allowance recorded		13,768	7,252
Non-accrual loans with a related allowance	6,080	6,435	4,627
Allowance for loan losses allocated with an allowance recorded		1,725	996
Commercial Portfolio Segment [Member] | Owner-Occupied [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded		3,265	7,130
Recorded investment with no related allowance recorded		2,385	6,609
Unpaid principal balance of impaired loans with an allowance recorded		711	1,362
Non-accrual loans with a related allowance	2,698	505	1,169
Allowance for loan losses allocated with an allowance recorded		3	90
Commercial Portfolio Segment [Member] | Food and Agriculture [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded		1,468	1,468
Recorded investment with no related allowance recorded		1,220	1,260
Unpaid principal balance of impaired loans with an allowance recorded		757	883
Non-accrual loans with a related allowance	88	751	845
Allowance for loan losses allocated with an allowance recorded		35	46
Commercial Real Estate Portfolio Segment [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded		548	2,454
Recorded investment with no related allowance recorded		441	1,876
Unpaid principal balance of impaired loans with an allowance recorded		232	313
Non-accrual loans with a related allowance	141	171	254
Allowance for loan losses allocated with an allowance recorded		1	2
Repurchase reserve	17,448	4,850	4,406
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded			1,435
Recorded investment with no related allowance recorded			1,208
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded		458	378
Recorded investment with no related allowance recorded		415	121
Non-accrual loans with a related allowance	6
Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded		90	641
Recorded investment with no related allowance recorded		26	547
Unpaid principal balance of impaired loans with an allowance recorded		232	313
Non-accrual loans with a related allowance	135	171	254
Allowance for loan losses allocated with an allowance recorded		1	2
Residential Portfolio Segment [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded		4,666	4,638
Recorded investment with no related allowance recorded		4,236	4,155
Unpaid principal balance of impaired loans with an allowance recorded		6,882	7,440
Non-accrual loans with a related allowance	4,867	6,021	6,471
Allowance for loan losses allocated with an allowance recorded		31	35
Repurchase reserve	11,492	3,468	3,800
Residential Portfolio Segment [Member] | Senior lien
Loans [Line Items]
Unpaid principal balance with no related allowance recorded		4,355	4,229
Recorded investment with no related allowance recorded		3,967	3,814
Unpaid principal balance of impaired loans with an allowance recorded		5,808	6,032
Non-accrual loans with a related allowance	4,158	5,034	5,178
Allowance for loan losses allocated with an allowance recorded		25	27
Residential Portfolio Segment [Member] | Junior lien
Loans [Line Items]
Unpaid principal balance with no related allowance recorded		311	409
Recorded investment with no related allowance recorded		269	341
Unpaid principal balance of impaired loans with an allowance recorded		1,074	1,408
Non-accrual loans with a related allowance	709	987	1,293
Allowance for loan losses allocated with an allowance recorded		6	8
Consumer Loan [Member]
Loans [Line Items]
Unpaid principal balance with no related allowance recorded		57	46
Recorded investment with no related allowance recorded		50	42
Non-accrual loans with a related allowance	10
Repurchase reserve	$ 461	$ 304	$ 349

Loans - Impaired Loans - Averag

Loans - Impaired Loans - Average Recorded Investment and Interest Income Recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Loans [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment		$ 32,674
Impaired Financing Receivable, Average Recorded Investment	$ 36,743
Impaired Financing Receivable, Interest Income, Cash Basis Method	421	446
Impaired Loans With No Related Allowance Recorded
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	22,209	18,848
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	278	306
Impaired Loans With Related Allowance Recorded
Loans [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	14,534	13,826
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	143	140
Commercial Portfolio Segment [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	17,227	12,190
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	275	304
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	8,003	6,759
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	29	24
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	13,062	4,132
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	248	168
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,653	4,677
Commercial Portfolio Segment [Member] | Municipal [Member]
Loans [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	554	1,220
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	17	19
Commercial Portfolio Segment [Member] | Owner-Occupied [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,849	6,799
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	27	38
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	796	862
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	12	5
Commercial Portfolio Segment [Member] | Food and Agriculture [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,316	1,259
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method		98
Commercial Real Estate Portfolio Segment [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	603	2,387
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	207	288
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	14	16
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment		1,208
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	575	606
Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	28	573
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	207	288
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	14	16
Residential Portfolio Segment [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4,368	4,259
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	3	2
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	6,275	6,743
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	100	100
Residential Portfolio Segment [Member] | Senior lien
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	4,081	3,904
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	1	0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	5,241	5,412
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	66	57
Residential Portfolio Segment [Member] | Junior lien
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	287	355
Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method	2	2
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	1,034	1,331
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method	34	43
Consumer Loan [Member]
Loans [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	11	12
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	$ 49	$ 36

Loans - Collateral Dependent Lo

Loans - Collateral Dependent Loans (Details) $ in Thousands	Dec. 31, 2020USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	$ 20,020
Management evaluated loan with amortized cost basis	250
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	14,903
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	10,584
Commercial Portfolio Segment [Member] | Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	3,985
Commercial Portfolio Segment [Member] | Food and Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	334
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	3,096
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	1,573
Commercial Real Estate Portfolio Segment [Member] | Commercial Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	1,523
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	2,021
Residential Portfolio Segment [Member] | Senior lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	2,021
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	16,731
Real Estate [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	11,614
Real Estate [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	7,579
Real Estate [Member] | Commercial Portfolio Segment [Member] | Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	3,701
Real Estate [Member] | Commercial Portfolio Segment [Member] | Food and Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	334
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	3,096
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	1,573
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	1,523
Real Estate [Member] | Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	2,021
Real Estate [Member] | Residential Portfolio Segment [Member] | Senior lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	2,021
Equipment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	3,289
Equipment [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	3,289
Equipment [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	3,005
Equipment [Member] | Commercial Portfolio Segment [Member] | Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	$ 284

Loans - Troubled Debt Restructu

Loans - Troubled Debt Restructuring and Loans Accounted for Under ASC Topic 310-30 Narratives (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)loanitem	Dec. 31, 2019USD ($)loan
Debt Instrument [Line Items]
Loans receivable	$ 4,293,949	$ 4,376,342
TDR's modified within the past year that defaulted on their restructured terms | loan	3	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 3,400	$ 700
ASC 310-30
Debt Instrument [Line Items]
Amortized cost basis of restructured loans	$ 4,200
COVID-19
Debt Instrument [Line Items]
Number of restructured loans not identified as TDRs | item	510
Loans modified and not identified as TDRs	$ 519,000
Loan modifications and not identified as TDRs, resumed payment of principal and interest	345,400
Loans receivable	$ 173,600
Outstanding Notes Receivable Balance Granted Relief (As a Percent)	4.00%
Percentage of subsequent modification	26.20%
COVID-19 | Contractual Interest Rate Reduction [Member]
Debt Instrument [Line Items]
Loans modified and not identified as TDRs	$ 167,100
COVID-19 | Payment Deferral [Member]
Debt Instrument [Line Items]
Loans modified and not identified as TDRs	$ 6,500
Troubled Debt Restructurings [Member]
Debt Instrument [Line Items]
Number of restructured loans | loan	24
Amortized cost basis of restructured loans	$ 10,800

Loans - Additional Informatio_2

Loans - Additional Information Related to Accruing TDR's (Details) - Accruing TDR [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Loans [Line Items]
Recorded Investment	$ 13,945	$ 6,885
Average year-to- date recorded investment	14,117	7,138
Unpaid principal balance	17,042	7,112
Unfunded commitments to fund TDRs	162	12
Commercial Portfolio Segment [Member]
Loans [Line Items]
Recorded Investment	9,387	5,615
Average year-to- date recorded investment	9,544	5,788
Unpaid principal balance	9,978	5,714
Unfunded commitments to fund TDRs	150
Commercial Real Estate Portfolio Segment [Member]
Loans [Line Items]
Recorded Investment	2,400	141
Average year-to- date recorded investment	2,351	172
Unpaid principal balance	4,105	192
Residential Portfolio Segment [Member]
Loans [Line Items]
Recorded Investment	2,121	1,129
Average year-to- date recorded investment	2,185	1,178
Unpaid principal balance	2,922	1,206
Unfunded commitments to fund TDRs	12	$ 12
Consumer Loan [Member]
Loans [Line Items]
Recorded Investment	37
Average year-to- date recorded investment	37
Unpaid principal balance	$ 37

Loans - Summary of Company's Ca

Loans - Summary of Company's Carrying Value of Non-Accrual TDR's (Details) - Non-Accruing TDR [Member] - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans [Line Items]
Carrying Value of Non - Accruing TDR's	$ 8,197	$ 4,854
Commercial Portfolio Segment [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR's	3,397	1,891
Commercial Real Estate Portfolio Segment [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR's	1,644	410
Residential Portfolio Segment [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR's	$ 3,156	$ 2,553

Allowance for Credit Losses - S

Allowance for Credit Losses - Summary of Company's Allowance for Loan Losses ("All") and Recorded Investment in Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 39,064	$ 35,692
Charge-offs	(3,228)	(8,599)
Recoveries	571	328
Provision	17,534	11,643
Ending balance	59,777	39,064
Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance	5,836
Commercial Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	30,442	27,137
Charge-offs	(2,023)	(7,422)
Recoveries	394	102
Provision	2,862	10,625
Ending balance	30,376	30,442
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance	(1,299)
Commercial Real Estate Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,850	4,406
Charge-offs	(412)	(116)
Recoveries		12
Provision	11,344	548
Ending balance	17,448	4,850
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance	1,666
Residential Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,468	3,800
Charge-offs	(67)	(124)
Recoveries	32	34
Provision	2,745	(242)
Ending balance	11,492	3,468
Residential Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance	5,314
Consumer Loan [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	304	349
Charge-offs	(726)	(937)
Recoveries	145	180
Provision	583	712
Ending balance	461	$ 304
Consumer Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance	$ 155

Allowance for Credit Losses - N

Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended											12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance For Loan And Lease Losses [Line Items]
Charge-offs, net												$ 2,700
Provision for loan losses	$ 1,200	$ 10,271	$ 6,159	$ 1,180	$ 5,690	$ 3,239	$ 1,534	$ 2,476	$ 807	$ 1,873	$ 41	17,630	$ 11,643	$ 5,197
Accrued interest receivable				$ 17,200								16,700	$ 17,200
Unfunded loan commitment reserves [Member]
Allowance For Loan And Lease Losses [Line Items]
Provision for loan losses												$ 100

Leases - ASC Topic 842 (Details

Leases - ASC Topic 842 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases
Lease right-of-use	$ 25,400	$ 29,200
Lease liabilities	$ 25,992	$ 29,500
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other Liabilities	Other Liabilities
Weighted-average remaining lease term (in years)	5 years 4 months 24 days	5 years 1 month 6 days
Weighted-average discount rate (in percent)	3.36%	3.36%
Rent expense	$ 5,700	$ 5,700
Remaining undiscounted cash flows
2021	5,276
2022	4,896
2023	4,529
2024	4,136
2025	3,539
Thereafter	12,294
Total lease payments	34,670
Less: Imputed interest	(8,678)
Present value of operating lease liabilities	$ 25,992	$ 29,500
Maximum
Leases
Term of lease (in years)	10 years
Minimum
Leases
Term of lease (in years)	1 year

Premises and Equipment - Schedu

Premises and Equipment - Schedule of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total premises and equipment, at cost	$ 185,817	$ 183,694
Less: accumulated depreciation and amortization	(78,835)	(71,543)
Property, Plant and Equipment, Net, Total	106,982	112,151
Land [Member]
Property, Plant and Equipment [Line Items]
Total premises and equipment, at cost	33,149	32,911
Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Total premises and equipment, at cost	92,463	94,260
Equipment [Member]
Property, Plant and Equipment [Line Items]
Total premises and equipment, at cost	$ 60,205	$ 56,523

Premises and Equipment - Narrat

Premises and Equipment - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)item	Dec. 31, 2019USD ($)item	Dec. 31, 2018USD ($)
Premises and Equipment
Depreciation expense	$ 8.1	$ 8.2	$ 8.6
Property, Plant and Equipment, Disposals	3.6	0	$ 1.7
Impairment on fixed assets related to banking center consolidations	$ 1.6	$ 0.9
Number of banking centers classified as held-for-sale | item	12	4
Banking center classified as held-for-sale	$ 8	$ 3.4

Other Real Estate Owned - Summa

Other Real Estate Owned - Summary of Activity in OREO Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Real Estate [Roll Forward]
Beginning balance	$ 4,730	$ 7,300	$ 10,596
Transfers from loan portfolio, at fair value	1,533	2,705	$ 24,940
Impairments	(470)	(1,082)
Sales	(3,633)	(4,919)
Ending balance	$ 7,300	$ 10,596

Other Real Estate Owned - Narra

Other Real Estate Owned - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Real Estate Owned
OREO sales	$ 3,633	$ 4,919
OREO Sold NBV	3,600	4,900
Gain (loss) on OREO sales, net	$ 38	$ 7,193	$ 488

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Goodwill and Intangible Assets
Goodwill acquired	$ 115,027	$ 115,027
Goodwill Impairment	0	0
Amortization of acquired identifiable intangibles	1,183	1,183	$ 2,170
Mortgage loans serviced	1,400,000	308,400
Mortgage service fees	1,700	1,000
Core Deposits
Goodwill and Intangible Assets
Amortization of acquired identifiable intangibles	$ 1,200	1,200	$ 2,200
Core Deposits | Minimum
Goodwill and Intangible Assets
Amortization period	7 years
Core Deposits | Maximum
Goodwill and Intangible Assets
Amortization period	10 years
MSRs
Goodwill and Intangible Assets
Amortization of acquired identifiable intangibles	$ 1,853	$ 824
MSRs | Measurement Input, Discount Rate [Member] | Minimum
Goodwill and Intangible Assets
Servicing assets measurement input (as a percent)	0.095	0.095
MSRs | Measurement Input, Discount Rate [Member] | Maximum
Goodwill and Intangible Assets
Servicing assets measurement input (as a percent)	0.105	0.105
MSRs | Measurement Input, Constant Prepayment Rate [Member] | Minimum
Goodwill and Intangible Assets
Servicing assets measurement input (as a percent)	0.154	0.148
MSRs | Measurement Input, Constant Prepayment Rate [Member] | Maximum
Goodwill and Intangible Assets
Servicing assets measurement input (as a percent)	0.213	0.220

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Carrying Amounts (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Core Deposits
Carrying amount of intangible assets
Gross carrying amount	$ 48,834	$ 48,834
Accumulated amortization	(41,286)	(40,103)
Net carrying amount	7,548	8,731
MSRs
Carrying amount of intangible assets
Net carrying amount	$ 10,380	$ 2,630	$ 3,556

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Summary of Estimated Future Amortization Expense (Details) $ in Thousands	Dec. 31, 2020USD ($)
Core Deposits
Estimated future amortization expense
For the years ending December 31, 2021	$ 1,183
For the years ending December 31, 2022	1,127
For the years ending December 31, 2023	1,048
For the years ending December 31, 2024	1,048
For the years ending December 31, 2025	1,048
MSRs
Estimated future amortization expense
For the years ending December 31, 2021	1,971
For the years ending December 31, 2022	1,626
For the years ending December 31, 2023	1,342
For the years ending December 31, 2024	1,108
For the years ending December 31, 2025	$ 914

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Changes in Servicing Rights (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes in the mortgage servicing rights
Amortization	$ (1,183)	$ (1,183)	$ (2,170)
MSRs
Changes in the mortgage servicing rights
Beginning balance	2,630	3,556
Originations	10,354	27
Impairment	(751)	(129)
Amortization	(1,853)	(824)
Ending balance	10,380	2,630	$ 3,556
Fair value of mortgage servicing rights	$ 11,542	$ 2,630

Deposits - Narrative (Details)

Deposits - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deposits
Total Deposits	$ 5,676,232	$ 4,737,132
Time deposits	986,132	$ 1,058,153
Minimum reserve required	$ 0

Deposits - Summary of Time Depo

Deposits - Summary of Time Deposits Based Upon Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deposits
2021	$ 659,509
2022	246,835
2023	47,150
2024	21,717
2025	9,940
Thereafter	981
Time Deposits, Total	$ 986,132	$ 1,058,153

Deposits - Schedule of Interest

Deposits - Schedule of Interest Expense on Deposits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deposits
Interest bearing demand deposits	$ 1,921	$ 1,514	$ 887
Money market accounts	5,342	9,046	5,622
Savings accounts	1,342	2,717	2,249
Time deposits	15,024	16,526	12,283
Interest expense	$ 23,629	$ 29,803	$ 21,041

Borrowings - Narrative (Details

Borrowings - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets Sold under Agreements to Repurchase [Line Items]
Amount of repurchase agreements	$ 22.9	$ 56.9	$ 66
Fair value of collateral	0	13.6
Fair value of Collateral pledged for repurchase agreement	2.1	7	5.9
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available	900
Loans pledged	1,200	1,500	1,600
Interest expense related to FHLB advances	1.3	6.3	2.6
Line of credit
Assets Sold under Agreements to Repurchase [Line Items]
FHLB advances	$ 0	192.7	234.3
Term financing
Assets Sold under Agreements to Repurchase [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Due Date, Earliest	2020
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Due Date, Last	2021
FHLB advances		15	67.3
Term financing | Minimum
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate range of FHLB advances	1.55%
Term financing | Maximum
Assets Sold under Agreements to Repurchase [Line Items]
Interest rate range of FHLB advances	2.33%
Federal Home Loan Bank of Des Moines [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Fair value of collateral	$ 0	17.6	16
Maturity on Demand [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Amount of repurchase agreements	0	0	0
U.S. Treasury Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Fair value of collateral	$ 27.7	$ 65.6	$ 73.9

Borrowings - Schedule of Select

Borrowings - Schedule of Selected Information Regarding Repurchase Agreements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deposits
Maximum amount of outstanding agreements at any month end during the period	$ 54,489	$ 68,600	$ 142,292
Average amount outstanding during the period	$ 30,355	$ 60,445	$ 87,691
Weighted average interest rate for the period	0.45%	1.11%	0.34%

Regulatory Capital - Capital Ra

Regulatory Capital - Capital Ratio Requirements under Prompt Corrective Action or Other Regulatory Requirements (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer	2.50%
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Leverage Ratio	10.7	11
Common equity risk-based ratio	14.7	13.2
Risk-based capital Ratio	14.7	13.2
Total risk-based capital Ratio	15.8	14.1
Leverage Amount	$ 696,311	$ 640,440
Common equity risk-based amount	696,311	640,440
Risk-based capital amount	696,311	640,440
Total risk-based capital Amount	$ 749,899	$ 682,645
Required to be considered adequately capitalized Ratio, leverage ratio	4	4
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio	7.00%	7.00%
Required to be considered adequately capitalized Ratio, risk-based capital ratio	8.5	8.5
Required to be considered adequately capitalized Ratio, Total risk-based capital ratio	10.5	10.5
Required to be considered adequately capitalized leverage Amount	$ 260,370	$ 231,950
Required to be considered adequately capitalized common equity capital amount	331,632	405,912
Required to be considered adequately capitalized risk-based capital Amount	402,696	412,620
Required to be considered adequately capitalized Total risk-based capital Amount	$ 497,448	$ 509,707
NBH Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Leverage Ratio	9.2	9.1
Common equity risk-based ratio	12.7	10.9
Risk-based capital Ratio	12.7	10.9
Total risk-based capital Ratio	13.8	11.8
Leverage Amount	$ 600,622	$ 528,028
Common equity risk-based amount	600,622	528,028
Risk-based capital amount	600,622	528,028
Total risk-based capital Amount	$ 654,209	$ 570,233
Required to be considered well capitalized Ratio, leverage ratio	5	5
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio	6.50%	6.50%
Required to be considered well capitalized Ratio, risk-based capital ratio	8	8
Required to be considered well capitalized Ratio, Total risk-based capital ratio	10	0.100
Required to be considered well capitalized leverage Amount	$ 325,447	$ 289,926
Required to be considered well capitalized common equity capital amount	307,631	376,903
Required to be considered well capitalized risk-based capital Amount	378,623	387,701
Required to be considered well capitalized Total risk-based capital Amount	$ 473,279	$ 484,626
Required to be considered adequately capitalized Ratio, leverage ratio	4	4
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio	7.00%	7.00%
Required to be considered adequately capitalized Ratio, risk-based capital ratio	8.5	8.5
Required to be considered adequately capitalized Ratio, Total risk-based capital ratio	10.5	10.5
Required to be considered adequately capitalized leverage Amount	$ 260,358	$ 231,940
Required to be considered adequately capitalized common equity capital amount	331,295	405,896
Required to be considered adequately capitalized risk-based capital Amount	402,287	411,932
Required to be considered adequately capitalized Total risk-based capital Amount	$ 496,943	$ 508,857

Revenue from Contracts with C_3

Revenue from Contracts with Clients - Non-interest income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contracts with Clients
Gain on OREO sales, net	$ (38)	$ (7,193)	$ (488)
Service charges
Revenue from Contracts with Clients
Non-interest income	14,962	17,895	18,092
Bank card fees
Revenue from Contracts with Clients
Non-interest income	15,446	14,595	14,489
ASU 2014-09
Revenue from Contracts with Clients
Non-interest income	140,258	82,752	70,775
ASU 2014-09 | In-scope of Topic 606
Revenue from Contracts with Clients
Non-interest income	32,359	34,315	34,897
Gain on OREO sales, net	38	7,193	488
Total Revenue	32,397	41,508	35,385
ASU 2014-09 | In-scope of Topic 606 | Service charges
Revenue from Contracts with Clients
Non-interest income	16,913	19,720	20,408
ASU 2014-09 | In-scope of Topic 606 | Bank card fees
Revenue from Contracts with Clients
Non-interest income	15,446	14,595	14,489
ASU 2014-09 | Out-of-scope of Topic 606
Revenue from Contracts with Clients
Non-interest income	$ 107,899	$ 48,437	$ 35,878

Stock-based Compensation and _3

Stock-based Compensation and Benefits - Narrative (Details) - USD ($)	12 Months Ended			72 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	4,314,726			4,314,726
Share-based Compensation Arrangement by Share-based Payment Award, Reduction in Number of Shares for Every One Option or Stock Appreciation Right Granted	1
Share-based Compensation Arrangement by Share-based Payment Award, Reduction in Number of Shares for Every One Award Other Than An Option or Stock Appreciation Right Granted	3.25
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 1,000,000	$ 700,000	$ 800,000
Unrecognized compensation expense	$ 700,000			$ 700,000
Unrecognized compensation cost, weighted-average period, years	1 year 2 months 12 days
Stock options [Member] | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Rights, Percentage				33.33%
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 2,500,000	$ 2,200,000	2,100,000
Awards granted (in shares)	127,400	86,689
Restricted Stock [Member] | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 2,100,000			$ 2,100,000
Unrecognized compensation cost, weighted-average period, years	2 years
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 1,800,000	$ 2,000,000	$ 1,500,000
Awards granted (in shares)	68,498	60,781
Performance stock units | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 2,500,000			$ 2,500,000
Unrecognized compensation cost, weighted-average period, years	1 year 8 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period	3 years
Awards granted (in shares)	68,498	60,781	77,125
Performance stock units | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member] | EPS target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards based on performance type	60.00%
Performance stock units | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member] | TSR target
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of awards based on performance type	40.00%
Employee Stock [Member] | Employee Stock Purchase Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum stock purchases by employees, value	$ 25,000
Maximum stock purchases by employees (in shares)	2,000
Discount on purchase of common stock (as a percent)	90.00%
Offering period for employee stock purchases	6 months
Number of shares authorized	400,000			400,000
Shares available for issuance	302,876			302,876
Employees purchased shares (in shares)	23,212	16,556
Minimum | Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Minimum | Restricted Stock [Member] | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Minimum | Performance stock units | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of initial target awards	0.00%
Maximum | Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Contractual term (in years)	10 years
Maximum | Restricted Stock [Member] | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Maximum | Performance stock units | NBH Holdings Corp. 2014 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of initial target awards	150.00%

Stock-based Compensation and _4

Stock-based Compensation and Benefits - Summary of Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding Options, beginning	657,114	1,264,876
Granted, Options	230,261
Exercised, Options	(94,007)
Forfeited, Options	(25,239)
Outstanding Options, ending	768,129	657,114
Options fully vested and exercisable at end of period, Options	412,940
Options expected to vest, Options	736,774
Outstanding, Weighted average exercise price, beginning	$ 26.69	$ 22.33
Granted, Weighted average exercise price	23.25
Exercised, Weighted average exercise price	19.95
Forfeited, Weighted average exercise price	30.59
Outstanding, Weighted average exercised price, ending	26.35	$ 26.69
Options fully vested and exercisable at end of period, Weighted average exercise price	25.64
Options expected to vest, Weighted average exercise price	$ 26.36
Outstanding, Weighted average remaining contractual term in years	6 years 10 months 28 days	6 years 4 months 28 days
Options fully vested and exercisable at end of period, weighted average remaining contractual term in years	5 years 3 months 25 days
Options expected to vest, Weighted average remaining contractual term in years	6 years 9 months 25 days
Outstanding, Aggregate intrinsic value, beginning	$ 5,626
Outstanding, Outstanding, Aggregate intrinsic value, beginning	5,224	$ 5,626
Aggregate intrinsic Value of Options fully vested and exercisable at end of period	3,101
Options expected to vest, Aggregate Intrinsic Value	$ 5,005

Stock-based Compensation and _5

Stock-based Compensation and Benefits - Schedule Of Weighted Average Assumptions Using Black-Scholes option-Pricing Model (Details) - Stock options [Member] - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation [Line Items]
Weighted average fair value	$ 3.37	$ 6.31	$ 7.43
Risk-free interest rate	0.44%	2.35%	2.69%
Expected volatility	25.08%	20.56%	20.75%
Expected term (years)	6 years 14 days	6 years 18 days	6 years 1 month 6 days
Dividend yield	3.44%	2.00%	1.13%

Stock-based Compensation and _6

Stock-based Compensation and Benefits - Summary of Restricted Stock Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average beginning measurement period price	$ 35.95
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested Restricted shares, Beginning (in shares)	122,198	146,494
Unvested Restricted shares, Granted (in shares)	127,400	86,689
Unvested Restricted shares, Vested (in shares)	(69,444)	(85,266)
Unvested Restricted shares, Forfeited (in shares)	(13,524)	(25,719)
Unvested Restricted shares, Ending (in shares)	166,630	122,198
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average grant-date fair value, Beginning (in dollars per share)	$ 34.19	$ 28.19
Weighted average grant-date fair value, Granted (in dollars per share)	23.94	35.05
Weighted average grant-date fair value, Vested (in dollars per share)	32.60	25.21
Weighted average grant-date fair value, Forfeited (in dollars per share)	29.25	32.68
Weighted average grant-date fair value, Ending (in dollars per share)	$ 27.42	$ 34.19
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested Restricted shares, Beginning (in shares)	158,874	192,049
Unvested Restricted shares, Granted (in shares)	68,498	60,781
Unvested Restricted shares, Net adjustment due to performance (in shares)	17,852	22,246
Unvested Restricted shares, Vested (in shares)	(53,540)	(95,308)
Unvested Restricted shares, Forfeited (in shares)	(6,847)	(20,894)
Unvested Restricted shares, Ending (in shares)	184,837	158,874
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average grant-date fair value, Beginning (in dollars per share)	$ 31.19	$ 26.40
Weighted average grant-date fair value, Granted (in dollars per share)	26.74	30.85
Weighted average grant-date fair value, Net adjustment due to performance (in dollars per share)	33.22	17.36
Weighted average grant-date fair value, Vested (in dollars per share)	33.22	18.02
Weighted average grant-date fair value, Forfeited (in dollars per share)	29.52	31.48
Weighted average grant-date fair value, Ending (in dollars per share)	29.21	31.19
ROTA
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average grant-date fair value, Granted (in dollars per share)	28.43
EPS
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average grant-date fair value, Granted (in dollars per share)		34.08
TSR
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted average grant-date fair value, Granted (in dollars per share)	$ 24.58	$ 27.01

Stock-based Compensation and _7

Stock-based Compensation and Benefits - Summarizes Information about Outstanding Stock Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number	768,129	657,114	1,264,876
Options Outstanding, Weighted Average Remaining Contractual Life in years	6 years 10 months 28 days	6 years 4 months 28 days
Options Outstanding, Weighted Average Exercise Price	$ 26.35	$ 26.69	$ 22.33
Options Vested, Number	736,774
Options Vested, Weighted Average Exercise Price	$ 26.36
18.00 - 22.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Low Range of Exercise Price	18
Options Outstanding, High Range of Exercise Price	$ 22.99
Options Outstanding, Number	228,228
Options Outstanding, Weighted Average Remaining Contractual Life in years	3 years 11 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 19.25
Options Vested, Number	228,228
Options Vested, Weighted Average Exercise Price	$ 19.25
23.00 - 27.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Low Range of Exercise Price	23
Options Outstanding, High Range of Exercise Price	$ 27.99
Options Outstanding, Number	219,652
Options Outstanding, Weighted Average Remaining Contractual Life in years	9 years 2 months 26 days
Options Outstanding, Weighted Average Exercise Price	$ 23.13
Options Vested, Number	936
Options Vested, Weighted Average Exercise Price	$ 23.75
28.00 - 32.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Low Range of Exercise Price	28
Options Outstanding, High Range of Exercise Price	$ 32.99
Options Outstanding, Number	110,753
Options Outstanding, Weighted Average Remaining Contractual Life in years	7 years 2 months 4 days
Options Outstanding, Weighted Average Exercise Price	$ 32.53
Options Vested, Number	71,223
Options Vested, Weighted Average Exercise Price	$ 32.64
33.00 and 37.99
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Low Range of Exercise Price	33
Options Outstanding, High Range of Exercise Price	$ 37.99
Options Outstanding, Number	207,597
Options Outstanding, Weighted Average Remaining Contractual Life in years	7 years 6 months 14 days
Options Outstanding, Weighted Average Exercise Price	$ 34.15
Options Vested, Number	111,289
Options Vested, Weighted Average Exercise Price	$ 34.12
38.00 and above
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Low Range of Exercise Price	38
Options Outstanding, Exercise Price	$ 38
Options Outstanding, Number	1,899
Options Outstanding, Weighted Average Remaining Contractual Life in years	7 years 7 months 17 days
Options Outstanding, Weighted Average Exercise Price	$ 40.36
Options Vested, Number	1,264
Options Vested, Weighted Average Exercise Price	$ 40.36

Common Stock - Narrative (Detai

Common Stock - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Feb. 26, 2020
Schedule Of Common Stock [Line Items]
Shares outstanding		30,634,291	31,176,627
Shares repurchased (shares)		734,117
Repurchase of shares		$ 19,476
Common Class A [Member]
Schedule Of Common Stock [Line Items]
Shares outstanding		30,634,291	31,176,627
Restricted issued but not yet vested, shares		166,630	122,198
February 2020 Board Authorized Share Repurchase Program
Schedule Of Common Stock [Line Items]
Stock repurchase program, authorized amount				$ 50,000
Remaining authorized amount		$ 43,100
Board Authorized Share Repurchase Programs [Member]
Schedule Of Common Stock [Line Items]
Repurchase of shares	$ 12,600
Maximum | February 2020 Board Authorized Share Repurchase Program
Schedule Of Common Stock [Line Items]
Stock repurchase program, authorized amount				$ 50,000

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share
Shares outstanding	30,634,291	31,176,627
Outstanding stock options to purchase common stock	768,129	657,114	1,264,876
Outstanding stock options to purchase common stock, per share	$ 26.35	$ 26.69	$ 22.33
Restricted shares outstanding	351,467	281,072	338,543

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Computation of Basic and Diluted Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 27,169	$ 27,893	$ 17,705	$ 15,824	$ 19,519	$ 21,642	$ 20,282	$ 18,922	$ 17,235	$ 18,240	$ 17,512	$ 8,464	$ 88,591	$ 80,365	$ 61,451
Less: income allocated to participating securities													(130)	(94)	(70)
Income allocated to common shareholders													$ 88,461	$ 80,271	$ 61,381
Weighted average shares outstanding for basic earnings per common share													30,857,086	31,175,825	30,748,234
Weighted average shares outstanding for diluted earnings per common share													31,075,857	31,530,817	31,430,074
Basic earnings per share (in dollars per share)	$ 0.88	$ 0.91	$ 0.57	$ 0.51	$ 0.62	$ 0.69	$ 0.65	$ 0.61	$ 0.56	$ 0.59	$ 0.57	$ 0.28	$ 2.87	$ 2.57	$ 2
Diluted earnings per share (in dollars per share)	$ 0.87	$ 0.90	$ 0.57	$ 0.50	$ 0.62	$ 0.69	$ 0.64	$ 0.60	$ 0.55	$ 0.58	$ 0.56	$ 0.27	$ 2.85	$ 2.55	$ 1.95
Equity Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of equity awards													218,771	354,992	681,840

Income Taxes - Components of In

Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current expense: [Abstract]
U.S. federal													$ 16,460	$ 8,947	$ 427
State and local													3,255	2,280	1,530
Total current income tax expense													19,715	11,227	1,957
Deferred expense:
U.S. federal													560	4,115	10,110
State and local													531	487	163
Total deferred income tax expense													1,091	4,602	10,273
Income tax expense	$ 6,319	$ 6,833	$ 4,429	$ 3,225	$ 3,864	$ 5,419	$ 3,179	$ 3,367	$ 3,381	$ 4,354	$ 2,800	$ 1,695	$ 20,806	$ 15,829	$ 12,230

Income Taxes - Components of Ta

Income Taxes - Components of Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
Statutory rate													21.00%	21.00%	21.00%
Income tax at federal statutory rates (21%)													$ 22,974	$ 20,201	$ 15,473
State income taxes, net of federal benefits													2,991	2,186	1,337
Tax-exempt loan interest income													(4,628)	(4,354)	(4,089)
Bank-owned life insurance income													(575)	(475)	136
Stock-based compensation													43	(1,925)	(1,207)
Other													1	196	580
Income tax expense	$ 6,319	$ 6,833	$ 4,429	$ 3,225	$ 3,864	$ 5,419	$ 3,179	$ 3,367	$ 3,381	$ 4,354	$ 2,800	$ 1,695	$ 20,806	$ 15,829	$ 12,230

Income Taxes - Significant Comp

Income Taxes - Significant Components of Deferred Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Excess tax basis of acquired loans over carrying value	$ 966	$ 2,053
Allowance for credit losses	14,154	9,414
Other real estate owned	634	810
Accrued stock-based compensation	2,070	1,945
Accrued compensation	3,674	3,425
Capitalized start-up costs	1,540	1,885
Accrued expenses	532	1,051
Net deferred loan fees	1,015	63
Net operating loss	641	707
Lease liability	6,154	7,113
Other	2,025	1,910
Total deferred tax assets	33,405	30,376
Deferred tax liabilities:
Intangible assets	(2,563)	(327)
Net unrealized gains on investment securities	(3,033)	(647)
Premises and equipment	(1,599)	(1,852)
Right of use assets	(6,015)	(7,033)
Prepaid expenses	(229)	(209)
Mortgage servicing rights	(2,458)	(634)
Other	(44)	(196)
Total deferred tax liabilities	(15,941)	(10,898)
Net deferred tax asset	$ 17,464	$ 19,478

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Income tax expense	$ 6,319	$ 6,833	$ 4,429	$ 3,225	$ 3,864	$ 5,419	$ 3,179	$ 3,367	$ 3,381	$ 4,354	$ 2,800	$ 1,695	$ 20,806	$ 15,829	$ 12,230
Income tax benefit from stock compensation activity													$ 51	$ 2,200	$ 1,300
Statutory rate													21.00%	21.00%	21.00%
Domestic Country [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryovers (NOLs)	2,400												$ 2,400
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryovers (NOLs)	$ 3,500												$ 3,500

Derivatives - FV of Derivatives

Derivatives - FV of Derivatives on the Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset derivatives fair value		$ 1,171
Liability derivatives fair value	$ 38,884	13,537
Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Asset derivatives fair value	25,150	10,519
Liability derivatives fair value	21,096	9,461
Other assets [Member] | Interest rate products [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset derivatives fair value		1,171
Other assets [Member] | Interest rate products [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Asset derivatives fair value	18,149	9,004
Other assets [Member] | Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Asset derivatives fair value	7,001	1,499
Other assets [Member] | Forward Contracts [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Asset derivatives fair value		16
Other liabilities [Member] | Interest rate products [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Liability derivatives fair value	38,884	13,537
Other liabilities [Member] | Interest rate products [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Liability derivatives fair value	18,176	9,021
Other liabilities [Member] | Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Liability derivatives fair value	298	141
Other liabilities [Member] | Forward Contracts [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Liability derivatives fair value	$ 2,622	$ 299

Derivatives - Narrative (Detail

Derivatives - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Hedged Loans	$ 389.9	$ 405.9
Cumulative fair value hedge adjustment	40.1	13.9
Termination value of derivatives in net liability position	59
Eligible collateral posted	63.4
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Notional amount		99.8
Interest Rate Lock Commitments Notional Amount Member
Derivative [Line Items]
Notional amount	258.8
Forward Contract Notional [Member]
Derivative [Line Items]
Notional amount	375.3	181.5
Designated as Hedging Instrument [Member] | Interest rate swap derivatives [Member]
Derivative [Line Items]
Notional amount	387.1	403.7
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swap derivatives [Member]
Derivative [Line Items]
Notional amount	$ 456	$ 478.9

Derivatives - Derivatives on th

Derivatives - Derivatives on the Income Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Amount of (loss) gain recognized in income on derivatives	$ 4,872	$ 1,460
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Amount of (loss) gain recognized in income on derivatives	4,405	10,397
Amount of gain (loss) recognized in income on hedged items	(6,376)	(9,603)
Interest rate products [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member] | Other Non-Interest expense [Member]
Derivative [Line Items]
Amount of (loss) gain recognized in income on derivatives	(7)	133
Interest rate products [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest income [Member]
Derivative [Line Items]
Amount of (loss) gain recognized in income on derivatives	4,405	10,397
Amount of gain (loss) recognized in income on hedged items	(6,376)	(9,603)
Forward Contracts [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member] | Mortgage banking income [Member]
Derivative [Line Items]
Amount of (loss) gain recognized in income on derivatives	(2,339)	189
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member] | Mortgage banking income [Member]
Derivative [Line Items]
Amount of (loss) gain recognized in income on derivatives	$ 7,218	$ 1,138

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Total Unfunded Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Commitment And Contingencies [Line Items]
Total unfunded commitments	$ 855,882	$ 862,250
Unfunded loan commitment reserves [Member]
Commitment And Contingencies [Line Items]
Total unfunded commitments	311,237	249,914
Unfunded Commitment Line Of Credit [Member]
Commitment And Contingencies [Line Items]
Total unfunded commitments	537,325	600,407
Commercial And Standby Letters Of Credit [Member]
Commitment And Contingencies [Line Items]
Total unfunded commitments	$ 7,320	$ 11,929

Commitments and Contingencies_2

Commitments and Contingencies - Repurchase Reserve (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Commitment And Contingencies [Line Items]
Repurchase reserve	$ 59,777	$ 39,064	$ 35,692
Loans Sold Subject to Repurchase [Member]
Commitment And Contingencies [Line Items]
Beginning balance	2,589	3,286
Provision charged to (released from) operating expense, net	662	(366)
Charge-offs	(510)	(331)
Ending balance	2,741	2,589
Repurchase reserve	$ 2,700	$ 2,600

Fair Value Measurements - Table

Fair Value Measurements - Tables of Financial Instruments Measured At Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	$ 934,392	$ 766,799
Total liabilities at fair value	59,980	22,998
Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	318	372
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	1,998
Loans held for sale member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	247,813	117,444
Mortgage-Backed Securities (MBS) [Member] | Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	196,334	95,256
Mortgage-Backed Securities (MBS) [Member] | Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	462,779	542,037
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	927,391	765,284
Total liabilities at fair value	57,060	22,558
Level 2 [Member] | Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	318	372
Level 2 [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	1,998
Level 2 [Member] | Loans held for sale member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	247,813	117,444
Level 2 [Member] | Mortgage-Backed Securities (MBS) [Member] | Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	196,334	95,256
Level 2 [Member] | Mortgage-Backed Securities (MBS) [Member] | Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	462,779	542,037
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	7,001	1,515
Total liabilities at fair value	2,920	440
Interest rate swap derivatives [Member] | Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	18,149	10,175
Total liabilities at fair value	57,060	22,558
Interest rate swap derivatives [Member] | Level 2 [Member] | Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	18,149	10,175
Total liabilities at fair value	57,060	22,558
Mortgage banking derivatives | Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	7,001	1,515
Total liabilities at fair value	2,920	440
Mortgage banking derivatives | Level 3 [Member] | Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	7,001	1,515
Total liabilities at fair value	$ 2,920	$ 440

Fair Value Measurements - Tab_2

Fair Value Measurements - Table of Changes in Level 3 Financial Instruments (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 1,075
Gain included in earnings, net	4,879
Fees and costs included in earnings, net	(1,873)
Ending Balance	$ 4,081

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020USD ($)loan	Dec. 31, 2019USD ($)loan	Dec. 31, 2018USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Level 1 to Level 2 Transfer, Asset	$ 0
Residential mortgage loans held for sale period	45 days
Interest Rate Lock Commitments, Average Percentage Of Estimated Pull Through Rate To Calculate Fair Value	86.1
Loans	$ 4,353,726,000	$ 4,415,406,000
Impairment on other real estate owned	470,000	1,082,000	$ 230,000
Impairment on fixed assets related to banking center consolidations	1,600,000	900,000
Net Book Balance Of Fixed Assets Sold	8,000,000	3,400,000
Banking centers classified as held-for-sale	$ 12
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated selling cost (as a percent)	6.00%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated selling cost (as a percent)	10.00%
Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated selling cost (as a percent)	9.70%
Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring Loans Reserves	$ 1,900,000	$ 1,800,000
Number of Loans measured | loan	7	7
Loans	$ 7,500,000	$ 5,900,000
Impaired Loans [Member] | Measurement Input, Discount Rate [Member] | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	3.00%
Impaired Loans [Member] | Measurement Input, Discount Rate [Member] | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	26.00%
Impaired Loans [Member] | Measurement Input, Discount Rate [Member] | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of loans measurement input (as a percent)	14.5
Mortgage servicing rights member | Measurement Input, Discount Rate [Member] | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing assets measurement input (as a percent)	9.5	9.5
Mortgage servicing rights member | Measurement Input, Discount Rate [Member] | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing assets measurement input (as a percent)	10.5	10.5
Mortgage servicing rights member | Measurement Input, Discount Rate [Member] | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing assets measurement input (as a percent)	9.5	9.6
Mortgage servicing rights member | Measurement Input, Constant Prepayment Rate [Member] | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing assets measurement input (as a percent)	15.4	14.8
Mortgage servicing rights member | Measurement Input, Constant Prepayment Rate [Member] | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing assets measurement input (as a percent)	21.3	22
Mortgage servicing rights member | Measurement Input, Constant Prepayment Rate [Member] | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing assets measurement input (as a percent)	15.8	15.7

Fair Value Measurements - Input

Fair Value Measurements - Inputs Used to Determine Fair Values of Oreo are Considered Level 3 Inputs in Fair Value Hierarchy (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	$ 934,392	$ 766,799
Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	48,614	46,078
Losses From Fair Value Changes	6,080	10,380
Impaired loans [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	25,480	32,763
Losses From Fair Value Changes	3,228	8,271
Other Real Estate Owned [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	4,730	7,300
Losses From Fair Value Changes	470	1,082
Mortgage servicing rights member | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	10,380	2,630
Losses From Fair Value Changes	751	129
Premises and Equipment [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	8,024	3,385
Losses From Fair Value Changes	$ 1,631	$ 898

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Schedule of Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
ASSETS:
Cash and cash equivalents	$ 605,565	$ 110,190
Investment securities available-for-sale (at fair value)	661,955	638,249
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	376,615	182,884
Non-marketable securities	16,493	29,751
Loans receivable	4,293,949	4,376,342
Total Loans	4,353,726	4,415,406
Loans held-for-sale	247,813	117,444
Accrued interest receivable	16,700	17,200
LIABILITIES:
Time deposits	986,132	1,058,153
Securities sold under agreements to repurchase	22,897	56,935
Federal Home Loan Bank advances		207,675
Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	196,334	95,256
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	306,187	127,560
Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	462,779	542,037
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	70,428	55,324
Other Securities [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	469	469
Municipal [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	375	487
Corporate Debt Securities [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	1,998
Carrying Amount [Member] | Level 1 [Member]
ASSETS:
Cash and cash equivalents	605,565	110,190
Carrying Amount [Member] | Level 2 [Member]
ASSETS:
Non-marketable securities	16,493	29,751
Loans held-for-sale	247,813	117,444
Accrued interest receivable	18,795	19,157
LIABILITIES:
Deposit transaction accounts	4,690,100	3,678,979
Time deposits	986,132	1,058,153
Securities sold under agreements to repurchase	22,897	56,935
Federal Home Loan Bank advances		207,675
Accrued interest payable	6,762	9,328
Carrying Amount [Member] | Level 3 [Member]
ASSETS:
Total Loans	4,353,726	4,415,406
Carrying Amount [Member] | Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	196,334	95,256
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	306,187	127,560
Carrying Amount [Member] | Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	462,779	542,037
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	70,428	55,324
Carrying Amount [Member] | Other Securities [Member] | Level 3 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	469	469
Carrying Amount [Member] | Municipal [Member] | Level 2 [Member]
ASSETS:
Municipal obligations	318	372
Carrying Amount [Member] | Municipal [Member] | Level 3 [Member]
ASSETS:
Municipal obligations	57	115
Carrying Amount [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	1,998
Estimated Fair Value [Member] | Level 1 [Member]
ASSETS:
Cash and cash equivalents	605,565	110,190
Estimated Fair Value [Member] | Level 2 [Member]
ASSETS:
Non-marketable securities	16,493	29,751
Loans held-for-sale	247,813	117,444
Accrued interest receivable	18,795	19,157
LIABILITIES:
Deposit transaction accounts	4,690,100	3,678,979
Time deposits	993,070	1,058,354
Securities sold under agreements to repurchase	22,897	56,935
Federal Home Loan Bank advances		207,890
Accrued interest payable	6,762	9,328
Estimated Fair Value [Member] | Level 3 [Member]
ASSETS:
Total Loans	4,511,357	4,481,209
Estimated Fair Value [Member] | Residential Mortgage Pass-Through Securities Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	196,334	95,256
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	310,930	128,770
Estimated Fair Value [Member] | Other Residential MBS Issued or Guaranteed by U.S. Government Agencies or Sponsored Enterprises [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	462,779	542,037
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	70,761	54,971
Estimated Fair Value [Member] | Other Securities [Member] | Level 3 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	469	469
Estimated Fair Value [Member] | Municipal [Member] | Level 2 [Member]
ASSETS:
Municipal obligations	318	372
Estimated Fair Value [Member] | Municipal [Member] | Level 3 [Member]
ASSETS:
Municipal obligations	57	115
Estimated Fair Value [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	1,998
Interest rate swap derivatives [Member] | Carrying Amount [Member] | Level 2 [Member]
ASSETS:
Derivative asset	18,149	10,175
LIABILITIES:
Derivative liability	57,060	22,558
Interest rate swap derivatives [Member] | Estimated Fair Value [Member] | Level 2 [Member]
ASSETS:
Derivative asset	18,149	10,175
LIABILITIES:
Derivative liability	57,060	22,558
Mortgage banking derivatives | Carrying Amount [Member] | Level 3 [Member]
ASSETS:
Derivative asset	7,001	1,515
LIABILITIES:
Derivative liability	2,920	440
Mortgage banking derivatives | Estimated Fair Value [Member] | Level 3 [Member]
ASSETS:
Derivative asset	7,001	1,515
LIABILITIES:
Derivative liability	$ 2,920	$ 440

Parent Company Only Financial_3

Parent Company Only Financial Statements - Condensed Statements of Financial Condition (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 605,565	$ 110,190
Other assets	212,893	194,813
Total assets	6,659,950	5,895,512
LIABILITIES AND SHAREHOLDERS' EQUITY
Other liabilities	140,130	126,850
Total liabilities	5,839,259	5,128,592
Stockholders' equity	820,691	766,920	$ 695,006	$ 532,407
Total liabilities and shareholders' equity	6,659,950	5,895,512
Parent Company [Member] | Reportable Legal Entities [Member]
ASSETS
Cash and cash equivalents	91,402	105,012
Investment in subsidiaries	725,002	654,508
Other assets	14,809	18,095
Total assets	831,213	777,615
LIABILITIES AND SHAREHOLDERS' EQUITY
Other liabilities	10,522	10,695
Total liabilities	10,522	10,695
Stockholders' equity	820,691	766,920
Total liabilities and shareholders' equity	$ 831,213	$ 777,615

Parent Company Only Financial_4

Parent Company Only Financial Statements - Condensed Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest expense:
Salaries and benefits													$ 141,170	$ 122,732	$ 114,939
Income before income taxes	$ 33,488	$ 34,726	$ 22,134	$ 19,049	$ 23,383	$ 27,061	$ 23,461	$ 22,289	$ 20,616	$ 22,594	$ 20,312	$ 10,159	109,397	96,194	73,681
Income tax expense	6,319	6,833	4,429	3,225	3,864	5,419	3,179	3,367	3,381	4,354	2,800	1,695	20,806	15,829	12,230
Net income	$ 27,169	$ 27,893	$ 17,705	$ 15,824	$ 19,519	$ 21,642	$ 20,282	$ 18,922	$ 17,235	$ 18,240	$ 17,512	$ 8,464	88,591	80,365	61,451
Parent Company [Member] | Reportable Legal Entities [Member]
Interest income															112
Equity in undistributed earnings of subsidiaries													67,416	28,133	19,682
Distributions from subsidiaries													27,200	55,725	47,338
Total income													94,616	83,858	67,132
Interest expense:
Salaries and benefits													5,136	4,925	4,455
Other expenses													2,621	2,463	4,467
Total expenses													7,757	7,388	8,922
Income before income taxes													86,859	76,470	58,210
Income tax expense													(1,732)	(3,895)	(3,241)
Net income													$ 88,591	$ 80,365	$ 61,451

Parent Company Only Financial_5

Parent Company Only Financial Statements - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 27,169	$ 27,893	$ 17,705	$ 15,824	$ 19,519	$ 21,642	$ 20,282	$ 18,922	$ 17,235	$ 18,240	$ 17,512	$ 8,464	$ 88,591	$ 80,365	$ 61,451
Stock-based compensation expense													5,299	4,869	4,420
Net excess tax benefit on stock-based compensation													51	(2,160)	(1,286)
Net cash (used in) provided by operating activities													(9,868)	42,476	73,574
Cash flows from investing activities:
Net cash used in investing activities													(148,935)	(113,285)	(102,017)
Cash flows from financing activities:
Issuance of stock under purchase and equity compensation plans													(749)	(6,229)	(772)
Proceeds from exercise of stock options													1,832	2,788	7,576
Payment of dividends													(24,816)	(23,530)	(16,624)
Repurchase of shares													(19,476)
Net cash provided by (used in) financing activities													654,178	71,443	(109,365)
Increase (decrease) in cash, cash equivalents and restricted cash													495,375	634	(137,808)
Cash, cash equivalents and restricted cash at beginning of the year				120,190				119,556				257,364	120,190	119,556	257,364
Cash, cash equivalents and restricted cash at end of period	615,565				120,190				119,556				615,565	120,190	119,556
Parent Company [Member] | Reportable Legal Entities [Member]
Cash flows from operating activities:
Net income													88,591	80,365	61,451
Equity in undistributed earnings of subsidiaries													(67,416)	(28,133)	(19,682)
Stock-based compensation expense													5,299	4,869	4,420
Net excess tax benefit on stock-based compensation													51	(2,160)	(1,286)
Other													3,074	5,045	9,230
Net cash (used in) provided by operating activities													29,599	59,986	54,133
Cash flows from investing activities:
Outlay for business combinations															(36,189)
Net cash used in investing activities															(36,189)
Cash flows from financing activities:
Issuance of stock under purchase and equity compensation plans													(749)	(6,229)	(772)
Proceeds from exercise of stock options													1,832	2,788	7,576
Payment of dividends													(24,816)	(23,530)	(16,624)
Repurchase of shares													(19,476)
Net cash provided by (used in) financing activities													(43,209)	(26,971)	(9,820)
Increase (decrease) in cash, cash equivalents and restricted cash													(13,610)	33,015	8,124
Cash, cash equivalents and restricted cash at beginning of the year				$ 115,012				$ 81,997				$ 73,873	115,012	81,997	73,873
Cash, cash equivalents and restricted cash at end of period	$ 101,402				$ 115,012				$ 81,997				$ 101,402	$ 115,012	$ 81,997

Quarterly Results of Operatio_3

Quarterly Results of Operations (unaudited) - Summary of Quarterly Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Results of Operations (unaudited)
Interest and dividend income	$ 53,288	$ 52,302	$ 53,744	$ 58,668	$ 59,616	$ 61,372	$ 62,193	$ 59,420	$ 57,780	$ 55,909	$ 54,911	$ 52,791	$ 218,002	$ 242,601	$ 221,391
Interest expense	4,732	5,587	6,416	8,321	9,228	9,587	9,702	8,254	7,148	6,137	5,525	5,144	25,056	36,771	23,954
Net interest income before provision for loan losses	48,556	46,715	47,328	50,347	50,388	51,785	52,491	51,166	50,632	49,772	49,386	47,647	192,946	205,830	197,437
Provision for loan losses		1,200	10,271	6,159	1,180	5,690	3,239	1,534	2,476	807	1,873	41	17,630	11,643	5,197
Net interest income after provision for loan losses	48,556	45,515	37,057	44,188	49,208	46,095	49,252	49,632	48,156	48,965	47,513	47,606	175,316	194,187	192,240
Non-interest income	33,357	44,532	38,837	23,532	20,282	24,759	20,660	17,051	15,317	18,061	19,562	17,835	140,258	82,752	70,775
Non-interest expense	48,425	55,321	53,760	48,671	46,107	43,793	46,451	44,394	42,857	44,432	46,763	55,282	206,177	180,745	189,334
Income before income taxes	33,488	34,726	22,134	19,049	23,383	27,061	23,461	22,289	20,616	22,594	20,312	10,159	109,397	96,194	73,681
Income tax expense	6,319	6,833	4,429	3,225	3,864	5,419	3,179	3,367	3,381	4,354	2,800	1,695	20,806	15,829	12,230
Net income	$ 27,169	$ 27,893	$ 17,705	$ 15,824	$ 19,519	$ 21,642	$ 20,282	$ 18,922	$ 17,235	$ 18,240	$ 17,512	$ 8,464	$ 88,591	$ 80,365	$ 61,451
Earnings per share-basic (in dollars per share)	$ 0.88	$ 0.91	$ 0.57	$ 0.51	$ 0.62	$ 0.69	$ 0.65	$ 0.61	$ 0.56	$ 0.59	$ 0.57	$ 0.28	$ 2.87	$ 2.57	$ 2
Earnings per share-diluted (in dollars per share)	$ 0.87	$ 0.90	$ 0.57	$ 0.50	$ 0.62	$ 0.69	$ 0.64	$ 0.60	$ 0.55	$ 0.58	$ 0.56	$ 0.27	$ 2.85	$ 2.55	$ 1.95

Acquisition Activities - Narrat

Acquisition Activities - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	Jan. 01, 2018	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Acquisition related expenses		$ (7,957)
Goodwill			$ 115,027	$ 115,027
Peoples Inc
Business Acquisition [Line Items]
Cash	$ 36,189
Cash consideration	3,398,477
Restricted cash placed in escrow	$ 10,000	10,000	$ 10,000	$ 10,000
Transaction value	$ 146,402
Closing price	$ 32.43
Acquisition related expenses		$ 8,000
Goodwill	$ 55,397
Mortgage repurchase reserve	4,000
FHLB borrowings	33,825
Gross contractual amounts receivable	713,600
Loans not expected to be collected	2,100
Peoples Inc | Core Deposits
Business Acquisition [Line Items]
Intangible asset	$ 10,477
Amortization period for intangible assets	10 years
Peoples Inc | MSRs
Business Acquisition [Line Items]
Intangible asset	$ 4,301

Acquisition Activities - Summar

Acquisition Activities - Summary of Net Assets Acquired (Details) - USD ($) $ / shares in Units, $ in Thousands	Jan. 01, 2018	Dec. 31, 2020	Dec. 31, 2019
Consideration:
Goodwill		$ 115,027	$ 115,027
Peoples Inc
Assets:
Cash and due from banks	$ 105,173
Investment securities available-for-sale	118,512
Non-marketable securities	4,796
Loans	542,707
Loans held for sale	54,260
Other real estate owned	1,253
Premises and equipment	18,584
Other assets	15,361
Total assets acquired	875,424
Liabilities:
Total deposits	729,911
FHLB borrowings	33,825
Other liabilities	20,683
Total liabilities assumed	784,419
Identifiable net assets acquired	91,005
Consideration:
NBHC common stock paid at January 1, 2018, closing price of $32.43	110,213
Cash	36,189
Total Consideration	146,402
Goodwill	$ 55,397
Closing price	$ 32.43
Peoples Inc | Core Deposits
Assets:
Intangible asset	$ 10,477
Amortization period for intangible assets	10 years
Peoples Inc | MSRs
Assets:
Intangible asset	$ 4,301

Subsequent Event (Details)

Subsequent Event (Details) - USD ($) $ in Millions	Feb. 24, 2021	Dec. 31, 2020	Feb. 26, 2020
February 2020 Board Authorized Share Repurchase Program
Subsequent Event [Line Items]
Stock repurchase, authorized amount			$ 50
Remaining authorized amount		$ 43.1
Subsequent Event
Subsequent Event [Line Items]
Stock repurchase, authorized amount	$ 75
Subsequent Event | February 2021 Board Authorized Share Purchase Program
Subsequent Event [Line Items]
Stock repurchase, authorized amount	75
Subsequent Event | February 2020 Board Authorized Share Repurchase Program
Subsequent Event [Line Items]
Remaining authorized amount	$ 6.9