National Bank (NBHC) 10-Q 5 Nov 20 2020 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Nov. 03, 2020
Document Document And Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 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, 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
Trading Symbol	NBHC
Security Exchange Name	NYSE
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
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		30,604,461
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001475841
Amendment Flag	false

Consolidated Statements of Fina

Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
ASSETS
Cash and due from banks	$ 444,603	$ 109,690
Interest bearing bank deposits	500	500
Cash and cash equivalents	445,103	110,190
Investment securities available-for-sale (at fair value)	572,523	638,249
Investment securities held-to-maturity (fair value of $197,597 and $183,741 at March 31, 2020 and December 31, 2019, respectively)	320,001	182,884
Non-marketable securities	29,598	29,751
Loans	4,556,121	4,415,406
Allowance for credit losses	(60,979)	(39,064)
Loans, net	4,495,142	4,376,342
Loans held for sale	273,003	117,444
Other real estate owned	4,590	7,300
Premises and equipment, net	108,860	112,151
Goodwill	115,027	115,027
Intangible assets, net	15,017	11,361
Other assets	221,812	194,813
Total assets	6,600,676	5,895,512
Liabilities:
Non-interest bearing demand deposits	1,533,676	1,184,945
Interest bearing demand deposits	976,133	738,496
Savings and money market	2,079,585	1,755,538
Time deposits	1,027,066	1,058,153
Total deposits	5,616,460	4,737,132
Securities sold under agreements to repurchase	23,904	56,935
Federal Home Loan Bank advances		207,675
Other liabilities	160,955	126,850
Total liabilities	5,801,319	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; 30,483,361 and 31,176,627 shares outstanding at March 31, 2020 and December 31, 2019, respectively	515	515
Additional paid-in capital	1,010,145	1,009,223
Retained earnings	202,238	164,082
Treasury stock of 20,883,923 and 20,189,082 shares at March 31, 2020 and December 31, 2019, respectively, at cost	(424,621)	(408,962)
Accumulated other comprehensive income, net of tax	11,080	2,062
Total shareholders' equity	799,357	766,920
Total liabilities and shareholders' equity	$ 6,600,676	$ 5,895,512

Consolidated Statements of Fi_2

Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Investment securities held-to-maturity, fair value	$ 324,720	$ 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	30,594,412	31,176,627
Treasury stock, shares	20,714,662	20,189,082

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest and dividend income:
Interest and fees on loans	$ 47,974,000	$ 55,708,000	$ 150,672,000	$ 164,478,000
Interest and dividends on investment securities	4,037,000	5,080,000	12,918,000	16,627,000
Dividends on non-marketable securities	221,000	417,000	945,000	1,299,000
Interest on interest-bearing bank deposits	70,000	167,000	179,000	581,000
Total interest and dividend income	52,302,000	61,372,000	164,714,000	182,985,000
Interest expense:
Interest on deposits	5,491,000	7,974,000	18,904,000	22,238,000
Interest on borrowings	96,000	1,613,000	1,420,000	5,305,000
Total interest expense	5,587,000	9,587,000	20,324,000	27,543,000
Net interest income before provision for loan losses	46,715,000	51,785,000	144,390,000	155,442,000
Provision for loan losses	1,200,000	5,690,000	17,630,000	10,463,000
Net interest income after provision for loan losses	45,515,000	46,095,000	126,760,000	144,979,000
Non-interest income:
Mortgage banking income	34,943,000	14,702,000	79,246,000	32,037,000
Bank-owned life insurance income	597,000	431,000	1,776,000	1,276,000
Other non-interest income	1,136,000	1,230,000	3,608,000	4,585,000
OREO-related income	75,000	27,000	103,000	147,000
Total non-interest income	44,532,000	24,759,000	106,901,000	62,470,000
Non-interest expense:
Salaries and benefits	38,614,000	33,522,000	108,251,000	92,079,000
Occupancy and equipment	6,878,000	6,825,000	20,854,000	20,428,000
Telecommunications and data processing	2,270,000	2,133,000	6,790,000	6,547,000
Marketing and business development	696,000	985,000	1,992,000	2,811,000
FDIC deposit insurance	409,000	58,000	744,000	1,049,000
Bank card expenses	1,275,000	1,288,000	3,334,000	3,521,000
Professional fees	714,000	743,000	2,082,000	2,598,000
Other non-interest expense	2,793,000	2,958,000	8,362,000	8,570,000
Problem asset workout	1,064,000	602,000	2,341,000	2,450,000
Loss (gain) on OREO sales, net	(119,000)	(6,514,000)	(25,000)	(7,200,000)
Core deposit intangible asset amortization	295,000	295,000	887,000	887,000
Banking center consolidation related expenses	432,000	898,000	2,140,000	898,000
Total non-interest expense	55,321,000	43,793,000	157,752,000	134,638,000
Income before income taxes	34,726,000	27,061,000	75,909,000	72,811,000
Income tax expense	6,833,000	5,419,000	14,487,000	11,965,000
Net income	$ 27,893,000	$ 21,642,000	$ 61,422,000	$ 60,846,000
Earnings per share-basic (in dollars per share)	$ 0.91	$ 0.69	$ 1.99	$ 1.95
Earnings per share-diluted (in dollars per share)	$ 0.90	$ 0.69	$ 1.97	$ 1.93
Weighted average number of common shares outstanding:
Basic (Shares)	30,756,116	31,281,970	30,881,325	31,133,982
Diluted (Shares)	30,924,223	31,508,999	31,070,997	31,537,334
Service charges and other fees
Non-interest income:
Non-interest income	$ 3,742,000	$ 4,617,000	$ 10,962,000	$ 13,479,000
Bank card fees
Non-interest income:
Non-interest income	$ 4,039,000	$ 3,752,000	$ 11,206,000	$ 10,946,000

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 27,893	$ 21,642	$ 61,422	$ 60,846
Securities available-for-sale:
Net unrealized gains arising during the period, net of tax expense of $3,301 and $1,706 for the three months ended March 31, 2020 and 2019, respectively.	(925)	1,828	9,627	15,150
Less: amortization of net unrealized holding gains to income, net of tax benefit of $68 and $90 for the three months ended March 31, 2020 and 2019, respectively.	(190)	(247)	(609)	(788)
Other comprehensive income	(1,115)	1,581	9,018	14,362
Comprehensive income	$ 26,778	$ 23,223	$ 70,440	$ 75,208

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Tax (expense) benefit on net unrealized gains arising during the period	$ 290	$ (574)	$ 3,021	$ 4,760
Tax (expense) benefit of amortization of net unrealized holding gains to income	$ 60	$ 78	$ 191	$ 249

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' 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, 2018	$ 515	$ 1,014,399		$ 106,990	$ (415,623)	$ (11,275)		$ 695,006
Increase (Decrease) in Stockholders' Equity
Net income				60,846				60,846
Stock-based compensation		3,325						3,325
Issuance of stock under purchase and equity compensation plans, including gain on reissuance of treasury stock, net		(10,096)			6,853			(3,243)
Cash dividends declared				(17,226)				(17,226)
Other comprehensive income (loss)						14,362		14,362
Balance in the ending at Sep. 30, 2019	515	1,007,628	$ (256)	150,866	(408,770)	3,087	$ (256)	753,326
Balance in the beginning at Jun. 30, 2019	515	1,006,008		135,210	(409,322)	1,506		733,917
Increase (Decrease) in Stockholders' Equity
Net income				21,642				21,642
Stock-based compensation		1,441						1,441
Issuance of stock under purchase and equity compensation plans, including gain on reissuance of treasury stock, net		179			552			731
Cash dividends declared				(5,986)				(5,986)
Other comprehensive income (loss)				1,581				1,581
Balance in the ending at Sep. 30, 2019	515	1,007,628	(256)	150,866	(408,770)	3,087	(256)	753,326
Balance in the beginning at Dec. 31, 2019	515	1,009,223		164,082	(408,962)	2,062		766,920
Increase (Decrease) in Stockholders' Equity
Net income				61,422				61,422
Stock-based compensation		4,028						4,028
Issuance of stock under purchase and equity compensation plans, including gain on reissuance of treasury stock, net		(3,106)			3,817			711
Repurchase of 734,117 shares					(19,476)			(19,476)
Cash dividends declared				(18,643)				(18,643)
Other comprehensive income (loss)						9,018		9,018
Balance in the ending at Sep. 30, 2020	515	1,010,145	4,623	202,238	(424,621)	11,080	4,623	799,357
Balance in the beginning at Jun. 30, 2020	515	1,008,773		180,537	(425,053)	12,195		776,967
Increase (Decrease) in Stockholders' Equity
Net income				27,893				27,893
Stock-based compensation		1,189						1,189
Issuance of stock under purchase and equity compensation plans, including gain on reissuance of treasury stock, net		183			432			615
Cash dividends declared				(6,192)				(6,192)
Other comprehensive income (loss)						(1,115)		(1,115)
Balance in the ending at Sep. 30, 2020	$ 515	$ 1,010,145	$ 4,623	$ 202,238	$ (424,621)	$ 11,080	$ 4,623	$ 799,357

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Stockholders' Equity [Abstract]
Gain on reissuance of treasury stock	$ 157	$ 373	$ 1,192	$ 6,106
Shares repurchased (shares)			734,117

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income	$ 61,422,000	$ 60,846,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	17,630,000	10,463,000
Provision (release) for mortgage loan repurchases	604,000	(639,000)
Depreciation and amortization	11,804,000	11,112,000
Current income tax receivable	2,394,000	3,498,000
Deferred income taxes	1,251,000	7,431,000
Net excess tax expense (benefit) on stock-based compensation	120,000	(2,162,000)
Discount accretion, net of premium amortization on securities	1,983,000	1,483,000
Loan accretion	(9,687,000)	(12,291,000)
Gain on sale of mortgages, net	(76,397,000)	(30,086,000)
Origination of loans held for sale, net of repayments	(1,703,208,000)	(946,576,000)
Proceeds from sales of loans held for sale	1,626,392,000	820,905,000
Bank-owned life insurance income	(1,776,000)	(1,276,000)
Loss (gain) on the sale of other real estate owned, net	(25,000)	(7,200,000)
Originations of mortgage serving rights	(6,627,000)	(26,000)
Impairment of mortgage servicing rights	847,000	453,000
Impairment on other real estate owned	423,000	872,000
Impairment on fixed assets related to banking center consolidations	1,631,000	898,000
Stock-based compensation	4,028,000	3,325,000
Operating lease payments	(4,092,000)	(4,209,000)
Change in other assets	(33,877,000)	(7,273,000)
Change in other liabilities	43,447,000	29,848,000
Net cash provided by (used in) operating activities	(61,713,000)	(60,604,000)
Cash flows from investing activities:
Purchase of FHLB stock	(447,000)	(13,422,000)
Proceeds from redemption of FHLB stock	600,000	13,700,000
Proceeds from maturities of investment securities held-to-maturity	58,099,000	44,090,000
Proceeds from maturities of investment securities available-for-sale	191,846,000	146,316,000
Proceeds from sales of investment securities available-for-sale		20,378,000
Purchase of investment securities held-to-maturity	(196,736,000)
Purchase of investment securities available-for-sale	(114,735,000)	(18,005,000)
Increase in securities purchased under agreement to resell	(33,031,000)
Net increase in loans	(142,133,000)	(305,450,000)
Purchases of premises and equipment, net	(4,498,000)	(7,743,000)
Proceeds from sales of other real estate owned	3,498,000	11,508,000
Net cash used in investing activities	(204,506,000)	(108,628,000)
Cash flows from financing activities:
Net increase in deposits	879,328,000	198,239,000
Net increase in repurchase agreements and other short-term borrowings		6,688,000
Advances from FHLB	947,431,000	1,199,492,000
FHLB repayments	(1,155,106,000)	(1,207,255,000)
Issuance of stock under purchase and equity compensation plans	(570,000)	(6,079,000)
Proceeds from exercise of stock options	1,213,000	2,780,000
Payment of dividends	(18,657,000)	(17,270,000)
Repurchase of common stock	(19,476,000)
Net cash provided by financing activities	601,132,000	176,595,000
Increase (decrease) in cash, cash equivalents and restricted cash	334,913,000	7,363,000
Cash, cash equivalents and restricted cash at beginning of the year	120,190,000	119,556,000
Cash, cash equivalents and restricted cash at end of period	455,103,000	126,919,000
Supplemental disclosure of cash flow information during the period:
Cash paid for interest	21,433,000	25,050,000
Net tax payment (refund)	13,673,000	5,547,000
Supplemental schedule of non-cash activities:
Loans transferred to other real estate owned at fair value	1,186,000	2,488,000
Decrease in loans purchased but not settled	(6,119,000)	2,526,000
Loans transferred from loans held for sale to loans	$ 2,346,000	725,000
Lease right-of-use assets obtained		$ (30,474,000)

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) - Peoples Inc	Sep. 30, 2020USD ($)
Restricted cash placed in escrow	$ 10,000,000
Restricted Cash, Asset, Statement of Financial Position [Extensible List]	Other Assets

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2020
Basis of Presentation
Basis of Presentation	Note 1 Basis of Presentation ​ National Bank Holdings Corporation ("NBHC" or the "Company") 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 100 banking centers, as of September 30, 2020, located primarily in Colorado and the greater Kansas City region, and through online and mobile banking products and services. ​ The accompanying interim unaudited consolidated financial statements serve to update the National Bank Holdings Corporation Annual Report on Form 10-K Form 10-K ​ 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 (“OREO”), 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 mortgage servicing rights (“MSRs”), the fair values of financial instruments, the allowance for credit losses (“ACL”) 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. ​ The Company's significant accounting policies followed in the preparation of the unaudited consolidated financial statements are disclosed in note 2 of the audited financial statements and notes for the year ended December 31, 2019 and are contained in the Company's Annual Report on Form 10-K ​ Allowance for credit losses (“ACL”) Measurement of Credit Losses on Financial Instruments ​ Loans ​ 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 troubled debt restructurings (“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 discounted cash flow ("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. The model incorporates forecasts of certain national macroeconomic factors which drive correlated Probability of Default (“PD”) and Loss Given Default (“LGD”) rates, which 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 near term, we revert to historical long-term average loss rates on a straight-line basis. The length of the forecast and reversion periods is based on management’s assessment of the length and pattern of the current economic cycle. ​ 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 accrued interest receivable ("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. ​ 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. For U.S. agency-backed held-to-maturity securities, since the risk of nonpayment of the amortized cost basis is zero, the Company will not measure expected credit losses on these securities. 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 accumulated other comprehensive income (“AOCI”). Credit losses are not estimated for AIR from investment securities as interest deemed uncollectible is written off through interest income.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2020
Recent Accounting Pronouncements
Recent Accounting Pronouncements	Note 2 Recent Accounting Pronouncements ​ Financial Instruments - Credit Losses Measurement of Credit Losses on Financial Instruments ​ Other Pronouncements Fair Value Measurement Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement , Intangibles - Goodwill and Other Simplifying the Test for Goodwill Impairment . ​

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Note 3 Investment Securities ​ The Company’s investment securities portfolio is comprised of available-for-sale and held-to-maturity investment securities. These investment securities totaled $0.9 billion at September 30, 2020 and included $0.6 billion of available-for-sale securities and $0.3 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: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ Amortized Gross Gross ​ ​ ​ ​ cost ​ unrealized gains ​ unrealized losses ​ Fair value Mortgage-backed securities (“MBS”): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 90,022 ​ $ 2,870 ​ $ — ​ $ 92,892 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ 466,648 ​ 10,114 ​ (112) ​ 476,650 Municipal securities ​ ​ 495 ​ ​ 14 ​ ​ — ​ ​ 509 Corporate debt ​ ​ 2,000 ​ ​ 3 ​ ​ — ​ ​ 2,003 Other securities ​ 469 ​ — ​ — ​ 469 Total investment securities available-for-sale ​ $ 559,634 ​ $ 13,001 ​ $ (112) ​ $ 572,523 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ At September 30, 2020 and December 31, 2019, the Company’s available-for-sale investment portfolio was primarily comprised of mortgage-backed securities, and all mortgage-backed securities were backed by government sponsored enterprises (“GSE”) collateral such as Federal Home Loan Mortgage Corporation (“FHLMC”) and Federal National Mortgage Association (“FNMA”) and the government owned agency Government National Mortgage Association (“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: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 26,992 ​ $ (90) ​ $ 2,394 ​ $ (22) ​ $ 29,386 ​ $ (112) Total ​ $ 26,992 ​ $ (90) ​ $ 2,394 ​ $ (22) ​ $ 29,386 ​ $ (112) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 September 30, 2020 and December 31, 2019. The portfolio included 12 securities, which were in an unrealized loss position at September 30, 2020, compared to 67 securities at December 31, 2019. The unrealized losses in the Company's investment portfolio at September 30, 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 Federal Reserve Bank (“FRB”), if needed. The fair value of available-for-sale investment securities pledged as collateral totaled $401.6 million and $352.3 million at September 30, 2020 and at December 31, 2019, respectively. The Bank may also pledge available-for-sale investment securities as collateral for Federal Home Loan Bank (“FHLB”) advances. No securities were pledged for this purpose at September 30, 2020, and securities totaling $13.6 million were pledged as collateral at the FHLB 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 September 30, 2020, the entire municipal securities portfolio with an amortized cost and fair value ​ As of September 30, 2020 and December 31, 2019, AIR from available-for-sale investment securities totaled $1.6 million and $1.5 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: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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 ​ $ 250,790 ​ $ 4,358 ​ $ (116) ​ $ 255,032 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ 69,211 ​ 477 ​ — ​ 69,688 Total investment securities held-to-maturity ​ $ 320,001 ​ $ 4,835 ​ $ (116) ​ $ 324,720 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ There were six held-to-maturity securities in an unrealized loss position as of September 30, 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: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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 ​ $ 59,053 ​ $ (116) ​ $ — ​ $ — ​ $ 59,053 ​ $ (116) Total ​ $ 59,053 ​ $ (116) ​ $ — ​ $ — ​ $ 59,053 ​ $ (116) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 $146.3 million and $144.2 million at September 30, 2020 and December 31, 2019, respectively. The Bank had no held-to-maturity investment securities pledged as collateral for FHLB advances at September 30, 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 September 30, 2020 and December 31, 2019, AIR from held-to-maturity investment securities totaled $0.6 million and $0.5 million, respectively, and was included within other assets on the statements of financial condition.

Loans

Loans	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Loans	Note 4 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 $22.3 million and $21.9 million as of September 30, 2020 and December 31, 2019, respectively. Included in commercial loans are loans originated as part of the Small Business Administration’s (“SBA”) Paycheck Protection Program (“PPP”) of which $348.3 million, net of fees and costs, are outstanding at September 30, 2020, which are fully guaranteed by the SBA. ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ Total loans % of total Commercial $ 3,217,406 ​ 70.6% Commercial real estate non-owner occupied 617,087 ​ 13.5% Residential real estate 700,927 ​ 15.4% Consumer 20,701 ​ 0.5% Total $ 4,556,121 ​ 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 are shown in the following tables at September 30, 2020 and December 31, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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 ​ $ 970 ​ $ — ​ $ 7,395 ​ $ 8,365 ​ $ 1,592,426 ​ $ 1,600,791 Municipal and non-profit ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 883,641 ​ ​ 883,641 Owner occupied commercial real estate ​ ​ 1,845 ​ ​ — ​ ​ 3,539 ​ ​ 5,384 ​ ​ 511,031 ​ ​ 516,415 Food and agribusiness ​ ​ 472 ​ ​ — ​ ​ 551 ​ ​ 1,023 ​ ​ 215,536 ​ ​ 216,559 Total commercial ​ ​ 3,287 ​ ​ — ​ ​ 11,485 ​ ​ 14,772 ​ ​ 3,202,634 ​ ​ 3,217,406 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ — ​ — ​ — ​ — ​ 77,361 ​ 77,361 Acquisition/development ​ — ​ — ​ 8 ​ 8 ​ 26,003 ​ 26,011 Multifamily ​ — ​ — ​ — ​ — ​ 69,925 ​ 69,925 Non-owner occupied ​ 2,633 ​ — ​ 20 ​ 2,653 ​ 441,137 ​ 443,790 Total commercial real estate ​ 2,633 ​ — ​ 28 ​ 2,661 ​ 614,426 ​ 617,087 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ ​ 506 ​ ​ 161 ​ ​ 6,625 ​ ​ 7,292 ​ ​ 611,971 ​ ​ 619,263 Junior lien ​ 154 ​ ​ — ​ ​ 697 ​ 851 ​ 80,813 ​ ​ 81,664 Total residential real estate ​ 660 ​ ​ 161 ​ ​ 7,322 ​ ​ 8,143 ​ ​ 692,784 ​ ​ 700,927 Consumer ​ 7 ​ — ​ 47 ​ 54 ​ 20,647 ​ 20,701 Total loans ​ $ 6,587 ​ $ 161 ​ $ 18,882 ​ $ 25,630 ​ $ 4,530,491 ​ $ 4,556,121 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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 $ 4,664 ​ $ 2,731 ​ $ 7,395 Municipal and non-profit ​ — ​ ​ — ​ ​ — Owner occupied commercial real estate ​ 633 ​ ​ 2,906 ​ ​ 3,539 Food and agribusiness ​ 178 ​ ​ 373 ​ ​ 551 Total commercial ​ 5,475 ​ ​ 6,010 ​ ​ 11,485 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ Construction — ​ — ​ — Acquisition/development 8 ​ — ​ 8 Multifamily — ​ — ​ — Non-owner occupied 20 ​ — ​ 20 Total commercial real estate 28 ​ — ​ 28 Residential real estate: ​ ​ ​ ​ ​ Senior lien ​ 4,429 ​ ​ 2,196 ​ ​ 6,625 Junior lien ​ 697 ​ ​ — ​ 697 Total residential real estate ​ 5,126 ​ ​ 2,196 ​ 7,322 Consumer 47 ​ — ​ 47 Total loans $ 10,676 ​ $ 8,206 ​ $ 18,882 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ $ 2,252 ​ $ 879 ​ $ 10,330 ​ $ 13,461 ​ $ 1,398,070 ​ $ 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 ​ ​ 3,263 ​ ​ 1,509 ​ ​ 12,911 ​ ​ 17,683 ​ ​ 2,974,624 ​ ​ 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 ​ $ 6,350 ​ $ 1,662 ​ $ 21,748 ​ $ 29,760 ​ $ 4,385,646 ​ $ 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 nine months ended September 30, 2020 or 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 1 Basis of Presentation. ​ 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 September 30, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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 ​ $ 488,391 ​ $ 231,994 ​ $ 217,190 ​ $ 98,442 ​ $ 16,130 ​ $ 19,820 ​ $ 478,080 ​ $ 2,290 ​ $ 1,552,337 Special mention ​ ​ 871 ​ ​ 1,327 ​ ​ 5,849 ​ ​ 5,018 ​ ​ 6,098 ​ ​ 824 ​ ​ 4,073 ​ ​ 1,019 ​ ​ 25,079 Substandard ​ ​ 27 ​ ​ 1,284 ​ ​ 1,317 ​ ​ 12,709 ​ ​ 6 ​ ​ 4,786 ​ ​ 2,145 ​ ​ — ​ ​ 22,274 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ 403 ​ ​ — ​ ​ 674 ​ ​ 24 ​ ​ — ​ ​ 1,101 Total commercial and industrial ​ ​ 489,289 ​ ​ 234,605 ​ ​ 224,356 ​ ​ 116,572 ​ ​ 22,234 ​ ​ 26,104 ​ ​ 484,322 ​ ​ 3,309 ​ ​ 1,600,791 Municipal and non-profit: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 116,484 ​ ​ 95,749 ​ ​ 133,050 ​ ​ 158,834 ​ ​ 132,527 ​ ​ 246,993 ​ ​ 4 ​ ​ — ​ ​ 883,641 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total municipal and non-profit ​ ​ 116,484 ​ ​ 95,749 ​ ​ 133,050 ​ ​ 158,834 ​ ​ 132,527 ​ ​ 246,993 ​ ​ 4 ​ ​ — ​ ​ 883,641 Owner occupied commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 67,503 ​ ​ 114,301 ​ ​ 95,751 ​ ​ 54,320 ​ ​ 33,105 ​ ​ 103,895 ​ ​ 1,396 ​ ​ 53 ​ ​ 470,324 Special mention ​ ​ 1,581 ​ ​ 2,996 ​ ​ 2,612 ​ ​ 548 ​ ​ 5,912 ​ ​ 19,496 ​ ​ — ​ ​ — ​ ​ 33,145 Substandard ​ ​ — ​ ​ 2,342 ​ ​ 6,231 ​ ​ 255 ​ ​ 102 ​ ​ 4,016 ​ ​ — ​ ​ — ​ ​ 12,946 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total owner occupied commercial real estate ​ ​ 69,084 ​ ​ 119,639 ​ ​ 104,594 ​ ​ 55,123 ​ ​ 39,119 ​ ​ 127,407 ​ ​ 1,396 ​ ​ 53 ​ ​ 516,415 Food and agribusiness: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 21,695 ​ ​ 9,417 ​ ​ 31,671 ​ ​ 7,366 ​ ​ 9,874 ​ ​ 28,770 ​ ​ 105,873 ​ ​ 167 ​ ​ 214,833 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 370 ​ ​ — ​ ​ — ​ ​ 370 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ 308 ​ ​ — ​ ​ 970 ​ ​ 69 ​ ​ — ​ ​ 1,347 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 1 ​ ​ 8 ​ ​ — ​ ​ 9 Total food and agribusiness ​ ​ 21,695 ​ ​ 9,417 ​ ​ 31,671 ​ ​ 7,674 ​ ​ 9,874 ​ ​ 30,111 ​ ​ 105,950 ​ ​ 167 ​ ​ 216,559 Total commercial ​ ​ 696,552 ​ ​ 459,410 ​ ​ 493,671 ​ ​ 338,203 ​ ​ 203,754 ​ ​ 430,615 ​ ​ 591,672 ​ ​ 3,529 ​ ​ 3,217,406 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 13,778 ​ ​ 37,496 ​ ​ 17,144 ​ ​ 4,097 ​ ​ — ​ ​ — ​ ​ 4,563 ​ ​ — ​ ​ 77,078 Special mention ​ ​ 283 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 283 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total construction ​ ​ 14,061 ​ ​ 37,496 ​ ​ 17,144 ​ ​ 4,097 ​ ​ — ​ ​ — ​ ​ 4,563 ​ ​ — ​ ​ 77,361 Acquisition/development: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 3,781 ​ ​ 2,030 ​ ​ 1,951 ​ ​ 8,503 ​ ​ 4,569 ​ ​ 4,653 ​ ​ 43 ​ ​ — ​ ​ 25,530 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ 35 ​ ​ — ​ ​ 253 ​ ​ — ​ ​ — ​ ​ 288 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 193 ​ ​ — ​ ​ — ​ ​ 193 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total acquisition/development ​ ​ 3,781 ​ ​ 2,030 ​ ​ 1,951 ​ ​ 8,538 ​ ​ 4,569 ​ ​ 5,099 ​ ​ 43 ​ ​ — ​ ​ 26,011 Multifamily: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 21,492 ​ ​ 13,743 ​ ​ 138 ​ ​ 7,273 ​ ​ 19,516 ​ ​ 5,380 ​ ​ — ​ ​ — ​ ​ 67,542 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 2,383 ​ ​ — ​ ​ — ​ ​ 2,383 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total multifamily ​ ​ 21,492 ​ ​ 13,743 ​ ​ 138 ​ ​ 7,273 ​ ​ 19,516 ​ ​ 7,763 ​ ​ — ​ ​ — ​ ​ 69,925 Non-owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 32,026 ​ ​ 96,992 ​ ​ 27,884 ​ ​ 110,225 ​ ​ 28,868 ​ ​ 121,540 ​ ​ 1,761 ​ ​ 49 ​ ​ 419,345 Special mention ​ ​ — ​ ​ — ​ ​ 5,912 ​ ​ 9,869 ​ ​ 3,966 ​ ​ 3,698 ​ ​ 100 ​ ​ — ​ ​ 23,545 Substandard ​ ​ — ​ ​ — ​ ​ 66 ​ ​ — ​ ​ — ​ ​ 834 ​ ​ — ​ ​ — ​ ​ 900 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total non-owner occupied ​ ​ 32,026 ​ ​ 96,992 ​ ​ 33,862 ​ ​ 120,094 ​ ​ 32,834 ​ ​ 126,072 ​ ​ 1,861 ​ ​ 49 ​ ​ 443,790 Total commercial real estate non-owner occupied ​ ​ 71,360 ​ ​ 150,261 ​ ​ 53,095 ​ ​ 140,002 ​ ​ 56,919 ​ ​ 138,934 ​ ​ 6,467 ​ ​ 49 ​ ​ 617,087 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 95,390 ​ ​ 95,318 ​ ​ 46,063 ​ ​ 54,423 ​ ​ 102,307 ​ ​ 192,309 ​ ​ 25,377 ​ ​ 327 ​ ​ 611,514 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 452 ​ ​ — ​ ​ — ​ ​ 452 Substandard ​ ​ 96 ​ ​ 359 ​ ​ 20 ​ ​ 1,530 ​ ​ 562 ​ ​ 4,730 ​ ​ — ​ ​ — ​ ​ 7,297 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ Revolving ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ loans ​ loans ​ ​ ​ ​ ​ Origination year ​ amortized ​ converted ​ ​ ​ ​ ​ 2020 ​ 2019 ​ 2018 ​ 2017 ​ 2016 ​ Prior ​ cost basis ​ to term ​ Total Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total senior lien ​ ​ 95,486 ​ ​ 95,677 ​ ​ 46,083 ​ ​ 55,953 ​ ​ 102,869 ​ ​ 197,491 ​ ​ 25,377 ​ ​ 327 ​ ​ 619,263 Junior lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 3,731 ​ ​ 4,767 ​ ​ 3,387 ​ ​ 1,963 ​ ​ 1,433 ​ ​ 4,397 ​ ​ 60,327 ​ ​ 508 ​ ​ 80,513 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 21 ​ ​ 347 ​ ​ — ​ ​ 368 Substandard ​ ​ — ​ ​ 114 ​ ​ 103 ​ ​ 196 ​ ​ 57 ​ ​ 313 ​ ​ — ​ ​ — ​ ​ 783 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total junior lien ​ ​ 3,731 ​ ​ 4,881 ​ ​ 3,490 ​ ​ 2,159 ​ ​ 1,490 ​ ​ 4,731 ​ ​ 60,674 ​ ​ 508 ​ ​ 81,664 Total residential real estate ​ ​ 99,217 ​ ​ 100,558 ​ ​ 49,573 ​ ​ 58,112 ​ ​ 104,359 ​ ​ 202,222 ​ ​ 86,051 ​ ​ 835 ​ ​ 700,927 Consumer ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 9,195 ​ ​ 4,529 ​ ​ 2,086 ​ ​ 636 ​ ​ 422 ​ ​ 732 ​ ​ 3,030 ​ ​ 24 ​ ​ 20,654 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Substandard ​ ​ — ​ ​ 20 ​ ​ — ​ ​ — ​ ​ 19 ​ ​ 8 ​ ​ — ​ ​ — ​ ​ 47 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total consumer ​ ​ 9,195 ​ ​ 4,549 ​ ​ 2,086 ​ ​ 636 ​ ​ 441 ​ ​ 740 ​ ​ 3,030 ​ ​ 24 ​ ​ 20,701 Total loans ​ $ 876,324 ​ $ 714,778 ​ $ 598,425 ​ $ 536,953 ​ $ 365,473 ​ $ 772,511 ​ $ 687,220 ​ $ 4,437 ​ $ 4,556,121 ​ 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 September 30, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ ​ ​ ​ ​ Total amortized ​ Real property ​ Business assets ​ cost basis Commercial ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial $ 7,936 ​ $ 4,441 ​ $ 12,377 Owner-occupied commercial real estate ​ 6,396 ​ ​ 284 ​ ​ 6,680 Food and agribusiness ​ 372 ​ ​ 86 ​ ​ 458 Total Commercial ​ 14,704 ​ ​ 4,811 ​ ​ 19,515 Commercial real estate non owner-occupied ​ ​ ​ ​ ​ ​ ​ ​ Acquisition/development 253 ​ — ​ 253 Multifamily 1,935 ​ — ​ 1,935 Non-owner occupied 556 ​ — ​ 556 Total commercial real estate 2,744 ​ — ​ 2,744 Residential real estate ​ ​ ​ ​ ​ Senior lien 2,196 ​ — ​ 2,196 Total residential real estate 2,196 ​ — ​ 2,196 Total loans $ 19,644 ​ $ 4,811 ​ $ 24,455 ​ 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 troubled debt restructurings under ASC Topic 310 if the borrower has been adversely impacted by COVID-19 and was current on their loan payments as of December 31, 2019. During the three and nine months ended September 30, 2020, the Company modified 20 and 483 loans totaling $7.1 million and $499.5 million, respectively, due to the effects of the COVID-19 pandemic that were not classified as TDRs. Loans with COVID-related modifications during the nine months ended September 30, 2020 totaled 11.6% of the total loan portfolio at September 30, 2020. Of those loans, $334.3 million have resumed making principal or interest payments or paid in full as of September 30, 2020. Modified loans that remained on a payment deferral plan at September 30, 2020 totaled $165.2 million, or 3.6% of the total loan portfolio, of which 84.0% were a second modification. Of those loans, principal payment deferrals totaled $155.1 million and full payment deferrals totaled $10.1 million All COVID modified loans were classified as performing as of September 30, 2020. ​ During the three months ended September 30, 2020, the Company restructured seven loans with an amortized cost basis of $0.8 million to facilitate repayment that are considered TDRs. During the nine months ended September 30, 2020, the Company restructured 21 loans with an amortized cost basis of $18.6 million to facilitate repayment that are considered TDRs. Included in the total TDR balance as of September 30, 2020 were loans totaling $4.4 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 September 30, 2020 and December 31, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ ​ Amortized ​ Average year-to-date ​ Unpaid ​ Unfunded commitments ​ ​ cost basis ​ amortized cost basis ​ principal balance ​ to fund TDRs Commercial ​ $ 14,903 ​ $ 15,394 ​ $ 15,527 ​ $ 157 Commercial real estate non-owner occupied ​ 5,076 ​ 4,938 ​ 7,001 ​ — Residential real estate ​ 1,807 ​ 1,851 ​ 2,630 ​ 12 Consumer ​ — ​ — ​ — ​ — Total ​ $ 21,786 ​ $ 22,183 ​ $ 25,158 ​ $ 169 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 September 30, 2020 and December 31, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ December 31, 2019 Commercial $ 1,590 $ 1,891 Commercial real estate non-owner occupied ​ — ​ 410 Residential real estate ​ 3,069 ​ 2,553 Consumer ​ — ​ — Total non-accruing TDRs ​ $ 4,659 ​ $ 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 no TDRs that were modified within the past 12 months and had defaulted on their restructured terms during the nine months ended September 30, 2020 or 2019. 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	9 Months Ended
	Sep. 30, 2020
Credit Loss [Abstract]
Allowance for Credit Losses	Note 5 Allowance for Credit Losses ​ The tables below detail the Company’s allowance for credit losses as of the dates shown: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, 2020 ​ ​ ​ ​ ​ Non-owner ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ commercial ​ Residential ​ ​ ​ ​ ​ ​ ​ Commercial real estate real estate Consumer Total Beginning balance ​ $ 33,142 ​ $ 12,314 ​ $ 14,525 ​ $ 484 ​ $ 60,465 Charge-offs ​ (499) ​ — ​ (16) ​ ​ (104) ​ (619) Recoveries ​ 104 ​ — ​ 4 ​ 25 ​ 133 Provision ​ (1,576) ​ 1,467 ​ 1,000 ​ 109 ​ 1,000 Ending balance ​ $ 31,171 ​ $ 13,781 ​ $ 15,513 ​ $ 514 ​ $ 60,979 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 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 ​ (1,411) ​ — ​ (56) ​ (502) ​ (1,969) Recoveries ​ 370 ​ — ​ 24 ​ 121 ​ 515 Provision ​ 3,069 ​ 7,265 ​ 6,763 ​ 436 ​ 17,533 Ending balance ​ $ 31,171 ​ $ 13,781 ​ $ 15,513 ​ $ 514 ​ $ 60,979 ​ ​ ​ ​ (1) ​ Related to the adoption of Accounting Standards Update No. 2016-13, Measurement of Credit Losses on Financial Instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, 2019 ​ ​ ​ ​ ​ Non-owner ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ commercial ​ Residential ​ ​ ​ ​ ​ ​ ​ Commercial real estate real estate Consumer Total Beginning balance ​ $ 30,823 ​ $ 5,067 ​ $ 3,851 ​ $ 341 ​ $ 40,082 Charge-offs ​ (6,760) ​ (1) ​ (77) ​ (263) ​ (7,101) Recoveries ​ 2 ​ — ​ 3 ​ 34 ​ 39 Provision ​ 5,730 ​ (11) ​ (214) ​ 185 ​ 5,690 Ending balance ​ $ 29,795 ​ $ 5,055 ​ $ 3,563 ​ $ 297 ​ $ 38,710 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 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 ​ (6,841) ​ (1) ​ (124) ​ (696) ​ (7,662) Recoveries ​ 31 ​ 11 ​ 32 ​ 143 ​ 217 Provision ​ 9,468 ​ 639 ​ (145) ​ 501 ​ 10,463 Ending balance ​ $ 29,795 ​ $ 5,055 ​ $ 3,563 ​ $ 297 ​ $ 38,710 ​ 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 the three months ended September 30, 2020 were $0.5 million. Provision for loan losses for funded loans of $1.0 million was recorded during the three months ended September 30, 2020. ​ Net charge-offs on loans during the nine months ended September 30, 2020 were $1.5 million. Provision for loan losses for funded loans of $17.5 million was recorded during the nine months ended September 30, 2020 to provide coverage for the impact of deteriorating economic conditions as a result of COVID-19 and to support net charge-offs. ​ Provision for loan losses totaled $5.7 million and $10.5 million for the three and nine months ended September 30, 2019, respectively, to support originated loan growth and net charge-offs. ​ The Company has elected to exclude AIR from the allowance for credit losses calculation. As of September 30, 2020 and December 31, 2019, AIR from loans totaled $20.6 million and $17.2 million, respectively.

Other Real Estate Owned

Other Real Estate Owned	9 Months Ended
	Sep. 30, 2020
Other Real Estate Owned
Other Real Estate Owned	Note 6 Other Real Estate Owned ​ A summary of the activity in OREO during the nine months ended September 30, 2020 and 2019 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ For the nine months ended September 30, ​ 2020 ​ 2019 Beginning balance $ 7,300 $ 10,596 Transfers from loan portfolio, at fair value 1,186 ​ 2,488 Impairments (423) ​ (872) Sales (3,473) ​ (4,308) Ending balance $ 4,590 ​ $ 7,904 ​ During the nine months ended September 30, 2020 and 2019, the Company sold OREO properties with net book balances of $3.5 million and $4.3 million, respectively. Sales of OREO properties resulted in net OREO gains of $0.1 million and $6.5 million, which were included in the consolidated statements of operations for the three months ended September 30, 2020 and 2019, respectively. Net OREO gains of $25 thousand and $7.2 million were included in the consolidated statements of operations for the nine months ended September 30, 2020 and 2019, respectively.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2020
Goodwill and Intangible Assets
Goodwill and Intangible Assets	Note 7 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 three or nine months ended September 30, 2020 or the year ended December 31, 2019. ​ The gross carrying amount of the core deposit intangibles and the associated accumulated amortization at September 30, 2020 and December 31, 2019, are presented as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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 $ (40,990) ​ $ 7,844 ​ $ 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 September 30, 2020: ​ ​ ​ ​ Years ending December 31, ​ Amount For the three months ending December 31, 2020 $ 296 For the year ending December 31, 2021 ​ 1,183 For the year ending December 31, 2022 ​ 1,127 For the year ending December 31, 2023 ​ 1,048 For the year ending December 31, 2024 ​ 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 were $985.3 million and $334.5 million at September 30, 2020 and 2019, respectively. ​ Below are the changes in the MSRs for the periods presented: ​ ​ ​ ​ ​ ​ ​ ​ For the nine months ended September 30, ​ 2020 ​ 2019 Beginning balance $ 2,630 $ 3,556 Originations ​ 6,627 ​ ​ 26 Impairment ​ (847) ​ ​ (453) Amortization (1,237) ​ (578) Ending balance ​ 7,173 ​ ​ 2,551 Fair value of mortgage servicing rights $ 7,653 ​ $ 2,551 ​ 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 18.0% to 21.8% for the September 30, 2020 valuation. Discount rates ranged from 9.5% to 10.5%, and the constant prepayment speed ranged from 17.9% to 26.7% for the September 30, 2019 valuation. Included in mortgage banking income in the consolidated statements of operations were service fees of $0.5 million and $1.0 million for the three and nine months ended September 30, 2020, respectively, and $0.2 million and $0.7 million for the three and nine months ended September 30, 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 September 30, 2020: ​ ​ ​ ​ Years ending December 31, ​ Amount For the three months ending December 31, 2020 $ 396 For the year ending December 31, 2021 ​ 1,507 For the year ending December 31, 2022 ​ 1,215 For the year ending December 31, 2023 ​ 980 For the year ending December 31, 2024 ​ 790 ​

Borrowings

Borrowings	9 Months Ended
	Sep. 30, 2020
Borrowings
Borrowings	Note 8 Borrowings ​ The Company enters into repurchase agreements to facilitate the needs of its clients. As of September 30, 2020 and December 31, 2019, the Company sold securities under agreements to repurchase totaling $23.9 million and $56.9 million, respectively. The Company pledged mortgage-backed securities with a fair value of approximately $28.8 million and $65.6 million as of September 30, 2020 and December 31, 2019, 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 September 30, 2020 and December 31, 2019, the Company had $4.2 million and $7.0 million, respectively, of excess collateral pledged for repurchase agreements. ​ 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 $1.0 billion at September 30, 2020. At September 30, 2020, the Bank had no outstanding borrowings from the FHLB. At December 31, 2019, the Bank had $192.7 million in line of credit advances from the FHLB that matured within a day and one term advance totaling $15.0 million with a fixed interest rate of 2.33% and a maturity date in October 2020 . ​ The Bank may have investment securities and loans pledged as collateral for FHLB advances. There were no investment securities pledged at September 30, 2020. At December 31, 2019, investment securities totaling $17.6 million were pledged as collateral for FHLB advances. Loans pledged were $1.3 billion at September 30, 2020 and $1.5 billion at December 31, 2019. Interest expense related to FHLB advances and other short-term borrowings totaled $0.1 million and $1.3 million for the three and nine months ended September 30, 2020, respectively, and $1.4 million and $4.8 million for the three and nine months ended September 30, 2019, respectively. ​

Regulatory Capital

Regulatory Capital	9 Months Ended
	Sep. 30, 2020
Regulatory Capital
Regulatory Capital	Note 9 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 September 30, 2020 and December 31, 2019, the Company and the Bank met all capital requirements including the capital conservation buffer of 2.5%, which was fully phased in on January 1, 2019. The Bank had regulatory capital ratios in excess of the levels established for well-capitalized institutions, as detailed in the tables below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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 10.6% ​ $ 673,622 N/A ​ ​ N/A 4.0% ​ $ 254,180 NBH Bank 9.2% ​ 586,217 5.0% ​ $ 317,605 4.0% ​ 254,084 Common equity tier 1 risk based capital: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 14.3% ​ $ 673,622 ​ N/A ​ ​ N/A ​ 7.0% ​ $ 330,905 NBH Bank ​ 12.4% ​ ​ 586,217 ​ 6.5% ​ $ 307,342 ​ 7.0% ​ ​ 330,984 Tier 1 risk based capital ratio: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated 14.3% ​ $ 673,622 N/A ​ ​ N/A 8.5% ​ $ 401,813 NBH Bank 12.4% ​ 586,217 8.0% ​ $ 378,267 8.5% ​ 401,909 Total risk based capital ratio: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated 15.4% ​ $ 728,166 N/A ​ ​ N/A 10.5% ​ $ 496,358 NBH Bank 13.6% ​ 640,760 10.0% ​ $ 472,834 10.5% ​ 496,476 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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	9 Months Ended
	Sep. 30, 2020
Revenue from Contracts with Clients
Revenue from Contracts with Clients	Note 10 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 ​ 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 three and nine months ended September 30, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months ended September 30, ​ For the nine months ended September 30, ​ 2020 2019 ​ 2020 2019 Non-interest income ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ In-scope of Topic 606: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Service charges and other fees ​ $ 4,246 ​ $ 5,112 ​ $ 12,453 ​ $ 14,822 Bank card fees ​ ​ 4,039 ​ ​ 3,752 ​ ​ 11,206 ​ ​ 10,946 Non-interest income (in-scope of Topic 606) ​ ​ 8,285 ​ ​ 8,864 ​ ​ 23,659 ​ ​ 25,768 Non-interest income (out-of-scope of Topic 606) ​ ​ 36,247 ​ ​ 15,895 ​ ​ 83,242 ​ ​ 36,702 Total non-interest income ​ $ 44,532 ​ $ 24,759 ​ $ 106,901 ​ $ 62,470 Non-interest expense ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ In-scope of Topic 606: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gain on OREO sales, net ​ $ 119 ​ $ 6,514 ​ $ 25 ​ $ 7,200 Total revenue in-scope of Topic 606 ​ $ 8,404 ​ $ 15,378 ​ $ 23,684 ​ $ 32,968 ​ 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	9 Months Ended
	Sep. 30, 2020
Stock-based Compensation and Benefits
Stock-based Compensation and Benefits	Note 11 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. ​ Stock options ​ The Company issues stock options, which are primarily time-vesting with 1/3 ​ The expense associated with the awarded stock options was measured at fair value using a Black-Scholes option-pricing model. The outstanding option awards vest or have vested on a graded basis over 1-4 years of continuous service and have 10-year contractual terms. ​ The following table summarizes stock option activity for the nine months ended September 30, 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 225,936 ​ 23.13 ​ ​ ​ ​ ​ Exercised ​ (63,558) ​ ​ 19.77 ​ ​ ​ ​ ​ Forfeited (17,038) ​ 29.00 ​ ​ ​ ​ ​ Outstanding at September 30, 2020 802,454 ​ ​ 26.18 7.01 ​ ​ 2,474 Options exercisable at September 30, 2020 447,461 ​ ​ 25.35 5.43 ​ ​ 1,791 Options vested and expected to vest 764,282 ​ ​ 26.17 6.90 ​ ​ 2,390 ​ Stock option expense is a component of salaries and benefits in the consolidated statements of operations and totaled $0.1 million and $0.2 million for the three months ended September 30, 2020 and 2019, respectively, and $0.8 million and $0.5 million for the nine months ended September 30, 2020 and 2019, respectively. At September 30, 2020, there was $0.9 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 1.3 years. ​ Restricted stock awards ​ The Company issues primarily time-based restricted stock awards that vest over a range of a 1 - 3 year period. Restricted stock with time-based vesting was valued at the fair value of the shares on the date of grant as they are assumed to be held beyond the vesting period. ​ Performance stock units ​ 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 the nine months ended September 30, 2020 was $28.43 and $24.58, respectively. The initial weighted-average performance price for the TSR target portion granted during the nine months ended September 30, 2020 was $35.95. During the nine months ended September 30, 2020, the Company awarded an additional 17,852 units due to final performance results related to performance stock units granted in 2017. ​ The following table summarizes restricted stock and performance stock unit activity during the nine months ended September 30, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Weighted ​ ​ Restricted ​ average grant- ​ Performance ​ ​ average grant- ​ ​ stock shares ​ date fair value ​ stock units ​ ​ date fair value Unvested at December 31, 2019 ​ 122,198 ​ $ 34.19 ​ 158,874 ​ $ 31.19 Granted ​ 120,132 ​ ​ 23.58 ​ 68,498 ​ ​ 26.74 Net adjustment due to performance ​ — ​ ​ — ​ 17,852 ​ ​ 33.22 Vested ​ (53,995) ​ ​ 34.40 ​ (53,540) ​ ​ 33.22 Forfeited ​ (9,502) ​ ​ 29.94 ​ (6,032) ​ ​ 29.37 Unvested at September 30, 2020 ​ 178,833 ​ $ 27.22 ​ 185,652 ​ $ 29.22 ​ As of September 30, 2020, the total unrecognized compensation cost related to the non-vested restricted stock awards and performance stock units totaled $2.6 million and $3.1 million, respectively, and is expected to be recognized over a weighted average period of approximately 2.0 years and 1.9 years, respectively. Expense related to non-vested restricted stock awards totaled $0.7 million and $0.7 million during the three months ended September 30, 2020 and 2019, respectively, and $1.9 million and $1.6 million during the nine months ended September 30, 2020 and 2019, respectively. Expense related to non-vested performance stock units totaled $0.4 million and $0.5 million during the three months ended September 30, 2020 and 2019, respectively, and $1.3 million and $1.2 million during the nine months ended September 30, 2020 and 2019, 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 September 30, 2020. ​ Under the ESPP, employees purchased 23,212 shares and 16,556 shares during the nine months ended September 30, 2020 and 2019, respectively.

Common Stock

Common Stock	9 Months Ended
	Sep. 30, 2020
Common Stock
Common Stock	Note 12 Common Stock ​ The Company had 30,594,412 and 31,176,627 shares of Class A common stock outstanding at September 30, 2020 and December 31, 2019, respectively. Additionally, the Company had 178,833 and 122,198 shares outstanding at September 30, 2020 and December 31, 2019, respectively, of restricted Class A common stock issued but not yet vested under the 2014 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 September 30, 2020 was $43.1 million.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2020
Earnings Per Share
Earnings Per Share	Note 13 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 11. ​ The Company had 30,594,412 and 31,169,086 shares of Class A common stock outstanding as of September 30, 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 the three and nine months ended September 30, 2020 and 2019. ​ The following table illustrates the computation of basic and diluted earnings per share for the three and nine months ended September 30, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months ended ​ For the nine months ended ​ September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 Net income ​ $ 27,893 ​ $ 21,642 ​ $ 61,422 ​ $ 60,846 Less: income allocated to participating securities ​ (36) ​ (25) ​ (96) ​ (69) Income allocated to common shareholders ​ $ 27,857 ​ $ 21,617 ​ $ 61,326 ​ $ 60,777 Weighted average shares outstanding for basic earnings per common share ​ 30,756,116 ​ 31,281,970 ​ 30,881,325 ​ 31,133,982 Dilutive effect of equity awards ​ 168,107 ​ 227,029 ​ 189,672 ​ 403,352 Weighted average shares outstanding for diluted earnings per common share ​ 30,924,223 ​ 31,508,999 ​ 31,070,997 ​ 31,537,334 Basic earnings per share ​ $ 0.91 ​ $ 0.69 ​ $ 1.99 ​ $ 1.95 Diluted earnings per share ​ ​ 0.90 ​ ​ 0.69 ​ ​ 1.97 ​ ​ 1.93 ​ The Company had 802,454 and 661,467 outstanding stock options to purchase common stock at weighted average exercise prices of $26.18 and $26.73 per share at September 30, 2020 and 2019, 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 364,485 and 295,619 unvested restricted shares and performance stock units issued as of September 30, 2020 and 2019, 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.

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2020
Derivatives
Derivatives	Note 14 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 September 30, 2020 and December 31, 2019. ​ Information about the valuation methods used to measure fair value is provided in note 16. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset derivatives fair value ​ ​ ​ Liability derivatives fair value ​ ​ Balance Sheet ​ September 30, ​ December 31, ​ Balance Sheet ​ September 30, ​ December 31, ​ location 2020 2019 Location 2020 2019 Derivatives designated as hedging instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate products Other assets ​ $ — ​ $ 1,171 Other liabilities ​ $ 45,279 ​ $ 13,537 Total derivatives designated as hedging instruments ​ ​ ​ $ — ​ $ 1,171 ​ ​ ​ $ 45,279 ​ $ 13,537 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives not designated as hedging instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate products Other assets ​ $ 21,287 ​ $ 9,004 Other liabilities ​ $ 21,371 ​ $ 9,021 Interest rate lock commitments ​ Other assets ​ ​ 11,769 ​ ​ 1,499 ​ Other liabilities ​ ​ 440 ​ ​ 141 Forward contracts ​ Other assets ​ ​ 191 ​ ​ 16 ​ Other liabilities ​ ​ 1,006 ​ ​ 299 Total derivatives not designated as hedging instruments ​ ​ ​ $ 33,247 ​ $ 10,519 ​ ​ ​ $ 22,817 ​ $ 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 September 30, 2020, the Company had interest rate swaps with a notional amount of $395.3 million, which were designated as fair value hedges of interest rate risk. 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 $398.4 million and $405.9 million of the Company’s fixed-rate loans included in loans receivable on the statements of financial condition as of September 30, 2020 and December 31, 2019, respectively, before a gain of $46.9 million and $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 September 30, 2020, the Company had matched interest rate swap transactions with an aggregate notional amount of $492.3 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 $457.9 million and forward contracts with a notional value of $516.4 million at September 30, 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 in the consolidated statements of operations for the three and nine months ended September 30, 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 three months ended September 30, ​ For the nine months ended September 30, hedging relationships derivatives 2020 2019 2020 2019 Interest rate products Interest and fees on loans ​ $ 5,043 ​ $ 5,809 ​ $ 1,310 ​ $ (11,791) Total ​ ​ ​ $ 5,043 ​ $ 5,809 ​ $ 1,310 ​ $ (11,791) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Location of gain (loss) ​ Amount of (loss) gain recognized in income on hedged items ​ ​ recognized in income on ​ For the three months ended September 30, ​ For the nine months ended September 30, Hedged items hedged items 2020 2019 2020 2019 Interest rate products Interest and fees on loans ​ $ (4,993) $ (3,313) ​ $ (2,869) $ 11,604 Total ​ ​ ​ $ (4,993) $ (3,313) ​ $ (2,869) $ 11,604 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Location of gain (loss) ​ Amount of gain (loss) recognized in income on derivatives Derivatives not designated ​ recognized in income on ​ For the three months ended September 30, ​ For the nine months ended September 30, as hedging instruments derivatives 2020 2019 2020 2019 Interest rate products Other non-interest expense $ 8 $ (198) ​ $ (65) $ (761) Interest rate lock commitments ​ Mortgage banking income ​ ​ 3,243 ​ ​ 522 ​ ​ 14,174 ​ ​ 2,290 Forward contracts ​ Mortgage banking income ​ ​ 1,558 ​ ​ 348 ​ ​ (532) ​ ​ 49 Total ​ ​ $ 4,809 $ 672 ​ $ 13,577 $ 1,578 ​ 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 September 30, 2020, the termination value of derivatives in a net liability position related to these agreements was $69.3 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 September 30, 2020, the Company had posted $76.3 million in eligible collateral. If the Company had breached any of these provisions at September 30, 2020, it could have been required to settle its obligations under the agreements at the termination value.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies
Commitments and Contingencies	Note 15 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 September 30, 2020 and December 31, 2019 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 December 31, 2019 Commitments to fund loans ​ $ 280,496 ​ $ 249,914 Unfunded commitments under lines of credit ​ 557,464 ​ 600,407 Commercial and standby letters of credit ​ 8,862 ​ 11,929 Total unfunded commitments ​ $ 846,822 ​ $ 862,250 ​ Commitments to fund loans ​ Unfunded commitments under lines of credit ​ Commercial and standby letters of credit ​ 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 three and nine months ended September 30, 2020 totaling $214 thousand and $397 thousand, respectively, were primarily driven by early payoffs. The Company recorded a repurchase reserve of $2.8 million and $2.6 million at September 30, 2020 and December 31, 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 three months ended September 30, ​ For the nine months ended September 30, ​ ​ 2020 ​ 2019 ​ 2020 ​ 2019 Beginning balance ​ $ 2,725 ​ $ 2,633 ​ $ 2,589 ​ $ 3,286 Provision charged to (released from) operating expense, net ​ ​ 285 ​ ​ (111) ​ ​ 604 ​ ​ (639) Charge-offs ​ ​ (214) ​ ​ (24) ​ ​ (397) ​ ​ (149) Ending balance ​ $ 2,796 ​ $ 2,498 ​ $ 2,796 ​ $ 2,498 ​ 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	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 16 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 the nine months ended September 30, 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 valuation model to estimate the fair value of its forward commitments to sell residential mortgage loans (i.e., an estimate of what the Company would receive or pay to terminate the forward delivery contract based 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 September 30, 2020 and December 31, 2019 on the consolidated statements of financial condition utilizing the hierarchy structure described above: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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 ​ $ — ​ $ 92,892 ​ $ — ​ $ 92,892 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ — ​ 476,650 ​ — ​ 476,650 Municipal securities ​ ​ — ​ ​ 394 ​ ​ — ​ ​ 394 Corporate debt ​ ​ — ​ 2,003 ​ — ​ 2,003 Loans held for sale ​ — ​ 273,003 ​ — ​ 273,003 Interest rate swap derivatives ​ — ​ 21,287 ​ — ​ 21,287 Mortgage banking derivatives ​ ​ — ​ ​ — ​ ​ 11,960 ​ ​ 11,960 Total assets at fair value ​ $ — ​ $ 866,229 ​ $ 11,960 ​ $ 878,189 Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap derivatives ​ $ — ​ $ 66,650 ​ $ — ​ $ 66,650 Mortgage banking derivatives ​ ​ — ​ ​ — ​ ​ 1,446 ​ ​ 1,446 Total liabilities at fair value ​ $ — ​ $ 66,650 ​ $ 1,446 ​ $ 68,096 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 the nine months ended September 30, 2020: ​ ​ ​ ​ ​ ​ ​ Mortgage banking ​ ​ ​ derivatives, net Balance at December 31, 2019 ​ $ 1,075 Gain included in earnings, net ​ ​ 13,642 Fees and costs included in earnings, net ​ (4,203) Balance at September 30, 2020 ​ $ 10,514 ​ 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 MSRs calculation of fair value. For purposes of measuring impairment, the MSRs are stratified into certain risk characteristics including note type and note term. If the valuation model reflects a value less than the carrying value, MSRs are adjusted to fair value through a valuation allowance and the adjustment is included in mortgage banking income on the consolidated statements of operations. The inputs used to determine the fair values of MSRs are considered level 3 inputs in the fair value hierarchy. ​ 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 during the nine months ended September 30, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ ​ Total ​ Losses from fair value changes Individually evaluated loans ​ $ 33,603 ​ $ 1,969 Other real estate owned ​ 4,590 ​ 423 Premises and equipment ​ 8,024 ​ ​ 1,631 Mortgage servicing rights ​ 7,173 ​ 847 Total ​ $ 53,390 ​ $ 4,870 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2019 ​ ​ Total ​ Losses from fair value changes Individually evaluated loans ​ $ 37,002 ​ $ 7,571 Other real estate owned ​ 7,904 ​ 872 Premises and equipment ​ 3,385 ​ ​ 898 Mortgage servicing rights ​ ​ 2,879 ​ ​ 453 Total ​ $ 51,170 ​ $ 9,794 ​ The Company did not record any liabilities measured at fair value on a non-recurring basis during the nine months ended September 30, 2020.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Note 17 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 September 30, 2020 and December 31, 2019 are set forth below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Level in fair value September 30, 2020 December 31, 2019 ​ ​ measurement ​ Carrying ​ Estimated ​ Carrying ​ Estimated ​ ​ hierarchy ​ amount fair value amount fair value ASSETS ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents Level 1 ​ $ 445,103 ​ $ 445,103 ​ $ 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 ​ 92,892 ​ 92,892 ​ 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 ​ 476,650 ​ 476,650 ​ 542,037 ​ 542,037 Municipal securities available-for-sale ​ Level 2 ​ ​ 394 ​ ​ 394 ​ ​ 372 ​ ​ 372 Municipal securities available-for-sale ​ Level 3 ​ ​ 115 ​ ​ 115 ​ ​ 115 ​ ​ 115 Corporate debt ​ Level 2 ​ ​ 2,003 ​ ​ 2,003 ​ ​ — ​ ​ — 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 ​ 250,790 ​ 255,032 ​ 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 ​ 69,211 ​ 69,688 ​ 55,324 ​ 54,971 Non-marketable securities ​ Level 2 ​ ​ 29,598 ​ ​ 29,598 ​ ​ 29,751 ​ ​ 29,751 Loans receivable Level 3 ​ 4,556,121 ​ 4,723,757 ​ 4,415,406 ​ 4,481,209 Loans held for sale Level 2 ​ 273,003 ​ 273,003 ​ 117,444 ​ 117,444 Accrued interest receivable Level 2 ​ 22,852 ​ 22,852 ​ 19,157 ​ 19,157 Interest rate swap derivatives Level 2 ​ 21,287 ​ 21,287 ​ 10,175 ​ 10,175 Mortgage banking derivatives ​ Level 3 ​ ​ 11,960 ​ ​ 11,960 ​ ​ 1,515 ​ ​ 1,515 LIABILITIES ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposit transaction accounts Level 2 ​ 4,589,394 ​ 4,589,394 ​ 3,678,979 ​ 3,678,979 Time deposits Level 2 ​ 1,027,066 ​ 1,036,192 ​ 1,058,153 ​ 1,058,354 Securities sold under agreements to repurchase Level 2 ​ 23,904 ​ 23,904 ​ 56,935 ​ 56,935 Federal Home Loan Bank advances Level 2 ​ — ​ — ​ 207,675 ​ 207,890 Accrued interest payable Level 2 ​ 8,219 ​ 8,219 ​ 9,328 ​ 9,328 Interest rate swap derivatives ​ Level 2 ​ ​ 66,650 ​ ​ 66,650 ​ 22,558 ​ 22,558 Mortgage banking derivatives Level 3 ​ 1,446 ​ 1,446 ​ ​ 440 ​ ​ 440 ​

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities	Available-for-sale securities are summarized as follows as of the dates indicated: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ Amortized Gross Gross ​ ​ ​ ​ cost ​ unrealized gains ​ unrealized losses ​ Fair value Mortgage-backed securities (“MBS”): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 90,022 ​ $ 2,870 ​ $ — ​ $ 92,892 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ 466,648 ​ 10,114 ​ (112) ​ 476,650 Municipal securities ​ ​ 495 ​ ​ 14 ​ ​ — ​ ​ 509 Corporate debt ​ ​ 2,000 ​ ​ 3 ​ ​ — ​ ​ 2,003 Other securities ​ 469 ​ — ​ — ​ 469 Total investment securities available-for-sale ​ $ 559,634 ​ $ 13,001 ​ $ (112) ​ $ 572,523 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ $ 26,992 ​ $ (90) ​ $ 2,394 ​ $ (22) ​ $ 29,386 ​ $ (112) Total ​ $ 26,992 ​ $ (90) ​ $ 2,394 ​ $ (22) ​ $ 29,386 ​ $ (112) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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 ​ $ 250,790 ​ $ 4,358 ​ $ (116) ​ $ 255,032 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ 69,211 ​ 477 ​ — ​ 69,688 Total investment securities held-to-maturity ​ $ 320,001 ​ $ 4,835 ​ $ (116) ​ $ 324,720 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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	There were six held-to-maturity securities in an unrealized loss position as of September 30, 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: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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 ​ $ 59,053 ​ $ (116) ​ $ — ​ $ — ​ $ 59,053 ​ $ (116) Total ​ $ 59,053 ​ $ (116) ​ $ — ​ $ — ​ $ 59,053 ​ $ (116) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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)	9 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
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	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 $22.3 million and $21.9 million as of September 30, 2020 and December 31, 2019, respectively. Included in commercial loans are loans originated as part of the Small Business Administration’s (“SBA”) Paycheck Protection Program (“PPP”) of which $348.3 million, net of fees and costs, are outstanding at September 30, 2020, which are fully guaranteed by the SBA. ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ Total loans % of total Commercial $ 3,217,406 ​ 70.6% Commercial real estate non-owner occupied 617,087 ​ 13.5% Residential real estate 700,927 ​ 15.4% Consumer 20,701 ​ 0.5% Total $ 4,556,121 ​ 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 are shown in the following tables at September 30, 2020 and December 31, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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 ​ $ 970 ​ $ — ​ $ 7,395 ​ $ 8,365 ​ $ 1,592,426 ​ $ 1,600,791 Municipal and non-profit ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 883,641 ​ ​ 883,641 Owner occupied commercial real estate ​ ​ 1,845 ​ ​ — ​ ​ 3,539 ​ ​ 5,384 ​ ​ 511,031 ​ ​ 516,415 Food and agribusiness ​ ​ 472 ​ ​ — ​ ​ 551 ​ ​ 1,023 ​ ​ 215,536 ​ ​ 216,559 Total commercial ​ ​ 3,287 ​ ​ — ​ ​ 11,485 ​ ​ 14,772 ​ ​ 3,202,634 ​ ​ 3,217,406 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ — ​ — ​ — ​ — ​ 77,361 ​ 77,361 Acquisition/development ​ — ​ — ​ 8 ​ 8 ​ 26,003 ​ 26,011 Multifamily ​ — ​ — ​ — ​ — ​ 69,925 ​ 69,925 Non-owner occupied ​ 2,633 ​ — ​ 20 ​ 2,653 ​ 441,137 ​ 443,790 Total commercial real estate ​ 2,633 ​ — ​ 28 ​ 2,661 ​ 614,426 ​ 617,087 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ ​ 506 ​ ​ 161 ​ ​ 6,625 ​ ​ 7,292 ​ ​ 611,971 ​ ​ 619,263 Junior lien ​ 154 ​ ​ — ​ ​ 697 ​ 851 ​ 80,813 ​ ​ 81,664 Total residential real estate ​ 660 ​ ​ 161 ​ ​ 7,322 ​ ​ 8,143 ​ ​ 692,784 ​ ​ 700,927 Consumer ​ 7 ​ — ​ 47 ​ 54 ​ 20,647 ​ 20,701 Total loans ​ $ 6,587 ​ $ 161 ​ $ 18,882 ​ $ 25,630 ​ $ 4,530,491 ​ $ 4,556,121 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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 $ 4,664 ​ $ 2,731 ​ $ 7,395 Municipal and non-profit ​ — ​ ​ — ​ ​ — Owner occupied commercial real estate ​ 633 ​ ​ 2,906 ​ ​ 3,539 Food and agribusiness ​ 178 ​ ​ 373 ​ ​ 551 Total commercial ​ 5,475 ​ ​ 6,010 ​ ​ 11,485 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ Construction — ​ — ​ — Acquisition/development 8 ​ — ​ 8 Multifamily — ​ — ​ — Non-owner occupied 20 ​ — ​ 20 Total commercial real estate 28 ​ — ​ 28 Residential real estate: ​ ​ ​ ​ ​ Senior lien ​ 4,429 ​ ​ 2,196 ​ ​ 6,625 Junior lien ​ 697 ​ ​ — ​ 697 Total residential real estate ​ 5,126 ​ ​ 2,196 ​ 7,322 Consumer 47 ​ — ​ 47 Total loans $ 10,676 ​ $ 8,206 ​ $ 18,882 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ $ 2,252 ​ $ 879 ​ $ 10,330 ​ $ 13,461 ​ $ 1,398,070 ​ $ 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 ​ ​ 3,263 ​ ​ 1,509 ​ ​ 12,911 ​ ​ 17,683 ​ ​ 2,974,624 ​ ​ 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 ​ $ 6,350 ​ $ 1,662 ​ $ 21,748 ​ $ 29,760 ​ $ 4,385,646 ​ $ 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 September 30, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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 ​ $ 488,391 ​ $ 231,994 ​ $ 217,190 ​ $ 98,442 ​ $ 16,130 ​ $ 19,820 ​ $ 478,080 ​ $ 2,290 ​ $ 1,552,337 Special mention ​ ​ 871 ​ ​ 1,327 ​ ​ 5,849 ​ ​ 5,018 ​ ​ 6,098 ​ ​ 824 ​ ​ 4,073 ​ ​ 1,019 ​ ​ 25,079 Substandard ​ ​ 27 ​ ​ 1,284 ​ ​ 1,317 ​ ​ 12,709 ​ ​ 6 ​ ​ 4,786 ​ ​ 2,145 ​ ​ — ​ ​ 22,274 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ 403 ​ ​ — ​ ​ 674 ​ ​ 24 ​ ​ — ​ ​ 1,101 Total commercial and industrial ​ ​ 489,289 ​ ​ 234,605 ​ ​ 224,356 ​ ​ 116,572 ​ ​ 22,234 ​ ​ 26,104 ​ ​ 484,322 ​ ​ 3,309 ​ ​ 1,600,791 Municipal and non-profit: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 116,484 ​ ​ 95,749 ​ ​ 133,050 ​ ​ 158,834 ​ ​ 132,527 ​ ​ 246,993 ​ ​ 4 ​ ​ — ​ ​ 883,641 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total municipal and non-profit ​ ​ 116,484 ​ ​ 95,749 ​ ​ 133,050 ​ ​ 158,834 ​ ​ 132,527 ​ ​ 246,993 ​ ​ 4 ​ ​ — ​ ​ 883,641 Owner occupied commercial real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 67,503 ​ ​ 114,301 ​ ​ 95,751 ​ ​ 54,320 ​ ​ 33,105 ​ ​ 103,895 ​ ​ 1,396 ​ ​ 53 ​ ​ 470,324 Special mention ​ ​ 1,581 ​ ​ 2,996 ​ ​ 2,612 ​ ​ 548 ​ ​ 5,912 ​ ​ 19,496 ​ ​ — ​ ​ — ​ ​ 33,145 Substandard ​ ​ — ​ ​ 2,342 ​ ​ 6,231 ​ ​ 255 ​ ​ 102 ​ ​ 4,016 ​ ​ — ​ ​ — ​ ​ 12,946 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total owner occupied commercial real estate ​ ​ 69,084 ​ ​ 119,639 ​ ​ 104,594 ​ ​ 55,123 ​ ​ 39,119 ​ ​ 127,407 ​ ​ 1,396 ​ ​ 53 ​ ​ 516,415 Food and agribusiness: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 21,695 ​ ​ 9,417 ​ ​ 31,671 ​ ​ 7,366 ​ ​ 9,874 ​ ​ 28,770 ​ ​ 105,873 ​ ​ 167 ​ ​ 214,833 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 370 ​ ​ — ​ ​ — ​ ​ 370 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ 308 ​ ​ — ​ ​ 970 ​ ​ 69 ​ ​ — ​ ​ 1,347 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 1 ​ ​ 8 ​ ​ — ​ ​ 9 Total food and agribusiness ​ ​ 21,695 ​ ​ 9,417 ​ ​ 31,671 ​ ​ 7,674 ​ ​ 9,874 ​ ​ 30,111 ​ ​ 105,950 ​ ​ 167 ​ ​ 216,559 Total commercial ​ ​ 696,552 ​ ​ 459,410 ​ ​ 493,671 ​ ​ 338,203 ​ ​ 203,754 ​ ​ 430,615 ​ ​ 591,672 ​ ​ 3,529 ​ ​ 3,217,406 Commercial real estate non-owner occupied: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 13,778 ​ ​ 37,496 ​ ​ 17,144 ​ ​ 4,097 ​ ​ — ​ ​ — ​ ​ 4,563 ​ ​ — ​ ​ 77,078 Special mention ​ ​ 283 ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 283 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total construction ​ ​ 14,061 ​ ​ 37,496 ​ ​ 17,144 ​ ​ 4,097 ​ ​ — ​ ​ — ​ ​ 4,563 ​ ​ — ​ ​ 77,361 Acquisition/development: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 3,781 ​ ​ 2,030 ​ ​ 1,951 ​ ​ 8,503 ​ ​ 4,569 ​ ​ 4,653 ​ ​ 43 ​ ​ — ​ ​ 25,530 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ 35 ​ ​ — ​ ​ 253 ​ ​ — ​ ​ — ​ ​ 288 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 193 ​ ​ — ​ ​ — ​ ​ 193 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total acquisition/development ​ ​ 3,781 ​ ​ 2,030 ​ ​ 1,951 ​ ​ 8,538 ​ ​ 4,569 ​ ​ 5,099 ​ ​ 43 ​ ​ — ​ ​ 26,011 Multifamily: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 21,492 ​ ​ 13,743 ​ ​ 138 ​ ​ 7,273 ​ ​ 19,516 ​ ​ 5,380 ​ ​ — ​ ​ — ​ ​ 67,542 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 2,383 ​ ​ — ​ ​ — ​ ​ 2,383 Substandard ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total multifamily ​ ​ 21,492 ​ ​ 13,743 ​ ​ 138 ​ ​ 7,273 ​ ​ 19,516 ​ ​ 7,763 ​ ​ — ​ ​ — ​ ​ 69,925 Non-owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 32,026 ​ ​ 96,992 ​ ​ 27,884 ​ ​ 110,225 ​ ​ 28,868 ​ ​ 121,540 ​ ​ 1,761 ​ ​ 49 ​ ​ 419,345 Special mention ​ ​ — ​ ​ — ​ ​ 5,912 ​ ​ 9,869 ​ ​ 3,966 ​ ​ 3,698 ​ ​ 100 ​ ​ — ​ ​ 23,545 Substandard ​ ​ — ​ ​ — ​ ​ 66 ​ ​ — ​ ​ — ​ ​ 834 ​ ​ — ​ ​ — ​ ​ 900 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total non-owner occupied ​ ​ 32,026 ​ ​ 96,992 ​ ​ 33,862 ​ ​ 120,094 ​ ​ 32,834 ​ ​ 126,072 ​ ​ 1,861 ​ ​ 49 ​ ​ 443,790 Total commercial real estate non-owner occupied ​ ​ 71,360 ​ ​ 150,261 ​ ​ 53,095 ​ ​ 140,002 ​ ​ 56,919 ​ ​ 138,934 ​ ​ 6,467 ​ ​ 49 ​ ​ 617,087 Residential real estate: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Senior lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 95,390 ​ ​ 95,318 ​ ​ 46,063 ​ ​ 54,423 ​ ​ 102,307 ​ ​ 192,309 ​ ​ 25,377 ​ ​ 327 ​ ​ 611,514 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 452 ​ ​ — ​ ​ — ​ ​ 452 Substandard ​ ​ 96 ​ ​ 359 ​ ​ 20 ​ ​ 1,530 ​ ​ 562 ​ ​ 4,730 ​ ​ — ​ ​ — ​ ​ 7,297 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ Revolving ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ loans ​ loans ​ ​ ​ ​ ​ Origination year ​ amortized ​ converted ​ ​ ​ ​ ​ 2020 ​ 2019 ​ 2018 ​ 2017 ​ 2016 ​ Prior ​ cost basis ​ to term ​ Total Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total senior lien ​ ​ 95,486 ​ ​ 95,677 ​ ​ 46,083 ​ ​ 55,953 ​ ​ 102,869 ​ ​ 197,491 ​ ​ 25,377 ​ ​ 327 ​ ​ 619,263 Junior lien ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 3,731 ​ ​ 4,767 ​ ​ 3,387 ​ ​ 1,963 ​ ​ 1,433 ​ ​ 4,397 ​ ​ 60,327 ​ ​ 508 ​ ​ 80,513 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ 21 ​ ​ 347 ​ ​ — ​ ​ 368 Substandard ​ ​ — ​ ​ 114 ​ ​ 103 ​ ​ 196 ​ ​ 57 ​ ​ 313 ​ ​ — ​ ​ — ​ ​ 783 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total junior lien ​ ​ 3,731 ​ ​ 4,881 ​ ​ 3,490 ​ ​ 2,159 ​ ​ 1,490 ​ ​ 4,731 ​ ​ 60,674 ​ ​ 508 ​ ​ 81,664 Total residential real estate ​ ​ 99,217 ​ ​ 100,558 ​ ​ 49,573 ​ ​ 58,112 ​ ​ 104,359 ​ ​ 202,222 ​ ​ 86,051 ​ ​ 835 ​ ​ 700,927 Consumer ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 9,195 ​ ​ 4,529 ​ ​ 2,086 ​ ​ 636 ​ ​ 422 ​ ​ 732 ​ ​ 3,030 ​ ​ 24 ​ ​ 20,654 Special mention ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Substandard ​ ​ — ​ ​ 20 ​ ​ — ​ ​ — ​ ​ 19 ​ ​ 8 ​ ​ — ​ ​ — ​ ​ 47 Doubtful ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — ​ ​ — Total consumer ​ ​ 9,195 ​ ​ 4,549 ​ ​ 2,086 ​ ​ 636 ​ ​ 441 ​ ​ 740 ​ ​ 3,030 ​ ​ 24 ​ ​ 20,701 Total loans ​ $ 876,324 ​ $ 714,778 ​ $ 598,425 ​ $ 536,953 ​ $ 365,473 ​ $ 772,511 ​ $ 687,220 ​ $ 4,437 ​ $ 4,556,121
Schedule of collateral dependent loans	The amortized cost basis of collateral-dependent loans over $250 thousand was as follows at September 30, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ ​ ​ ​ ​ Total amortized ​ Real property ​ Business assets ​ cost basis Commercial ​ ​ ​ ​ ​ ​ ​ ​ Commercial and industrial $ 7,936 ​ $ 4,441 ​ $ 12,377 Owner-occupied commercial real estate ​ 6,396 ​ ​ 284 ​ ​ 6,680 Food and agribusiness ​ 372 ​ ​ 86 ​ ​ 458 Total Commercial ​ 14,704 ​ ​ 4,811 ​ ​ 19,515 Commercial real estate non owner-occupied ​ ​ ​ ​ ​ ​ ​ ​ Acquisition/development 253 ​ — ​ 253 Multifamily 1,935 ​ — ​ 1,935 Non-owner occupied 556 ​ — ​ 556 Total commercial real estate 2,744 ​ — ​ 2,744 Residential real estate ​ ​ ​ ​ ​ Senior lien 2,196 ​ — ​ 2,196 Total residential real estate 2,196 ​ — ​ 2,196 Total loans $ 19,644 ​ $ 4,811 ​ $ 24,455
Additional Information Related to Accruing TDR's	The tables below provide additional information related to accruing TDRs at September 30, 2020 and December 31, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ ​ Amortized ​ Average year-to-date ​ Unpaid ​ Unfunded commitments ​ ​ cost basis ​ amortized cost basis ​ principal balance ​ to fund TDRs Commercial ​ $ 14,903 ​ $ 15,394 ​ $ 15,527 ​ $ 157 Commercial real estate non-owner occupied ​ 5,076 ​ 4,938 ​ 7,001 ​ — Residential real estate ​ 1,807 ​ 1,851 ​ 2,630 ​ 12 Consumer ​ — ​ — ​ — ​ — Total ​ $ 21,786 ​ $ 22,183 ​ $ 25,158 ​ $ 169 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 September 30, 2020 and December 31, 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ December 31, 2019 Commercial $ 1,590 $ 1,891 Commercial real estate non-owner occupied ​ — ​ 410 Residential real estate ​ 3,069 ​ 2,553 Consumer ​ — ​ — Total non-accruing TDRs ​ $ 4,659 ​ $ 4,854 ​

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2020
Credit Loss [Abstract]
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: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, 2020 ​ ​ ​ ​ ​ Non-owner ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ commercial ​ Residential ​ ​ ​ ​ ​ ​ ​ Commercial real estate real estate Consumer Total Beginning balance ​ $ 33,142 ​ $ 12,314 ​ $ 14,525 ​ $ 484 ​ $ 60,465 Charge-offs ​ (499) ​ — ​ (16) ​ ​ (104) ​ (619) Recoveries ​ 104 ​ — ​ 4 ​ 25 ​ 133 Provision ​ (1,576) ​ 1,467 ​ 1,000 ​ 109 ​ 1,000 Ending balance ​ $ 31,171 ​ $ 13,781 ​ $ 15,513 ​ $ 514 ​ $ 60,979 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 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 ​ (1,411) ​ — ​ (56) ​ (502) ​ (1,969) Recoveries ​ 370 ​ — ​ 24 ​ 121 ​ 515 Provision ​ 3,069 ​ 7,265 ​ 6,763 ​ 436 ​ 17,533 Ending balance ​ $ 31,171 ​ $ 13,781 ​ $ 15,513 ​ $ 514 ​ $ 60,979 ​ ​ ​ ​ (1) ​ Related to the adoption of Accounting Standards Update No. 2016-13, Measurement of Credit Losses on Financial Instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Three months ended September 30, 2019 ​ ​ ​ ​ ​ Non-owner ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ commercial ​ Residential ​ ​ ​ ​ ​ ​ ​ Commercial real estate real estate Consumer Total Beginning balance ​ $ 30,823 ​ $ 5,067 ​ $ 3,851 ​ $ 341 ​ $ 40,082 Charge-offs ​ (6,760) ​ (1) ​ (77) ​ (263) ​ (7,101) Recoveries ​ 2 ​ — ​ 3 ​ 34 ​ 39 Provision ​ 5,730 ​ (11) ​ (214) ​ 185 ​ 5,690 Ending balance ​ $ 29,795 ​ $ 5,055 ​ $ 3,563 ​ $ 297 ​ $ 38,710 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nine months ended September 30, 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 ​ (6,841) ​ (1) ​ (124) ​ (696) ​ (7,662) Recoveries ​ 31 ​ 11 ​ 32 ​ 143 ​ 217 Provision ​ 9,468 ​ 639 ​ (145) ​ 501 ​ 10,463 Ending balance ​ $ 29,795 ​ $ 5,055 ​ $ 3,563 ​ $ 297 ​ $ 38,710

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	9 Months Ended
	Sep. 30, 2020
Other Real Estate Owned
Summary of Activity in OREO Balances	A summary of the activity in OREO during the nine months ended September 30, 2020 and 2019 is as follows: ​ ​ ​ ​ ​ ​ ​ ​ For the nine months ended September 30, ​ 2020 ​ 2019 Beginning balance $ 7,300 $ 10,596 Transfers from loan portfolio, at fair value 1,186 ​ 2,488 Impairments (423) ​ (872) Sales (3,473) ​ (4,308) Ending balance $ 4,590 ​ $ 7,904

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2020 and December 31, 2019, are presented as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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 $ (40,990) ​ $ 7,844 ​ $ 48,834 $ (40,103) ​ $ 8,731
Summary of changes in the mortgage servicing rights	Below are the changes in the MSRs for the periods presented: ​ ​ ​ ​ ​ ​ ​ ​ For the nine months ended September 30, ​ 2020 ​ 2019 Beginning balance $ 2,630 $ 3,556 Originations ​ 6,627 ​ ​ 26 Impairment ​ (847) ​ ​ (453) Amortization (1,237) ​ (578) Ending balance ​ 7,173 ​ ​ 2,551 Fair value of mortgage servicing rights $ 7,653 ​ $ 2,551
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 September 30, 2020: ​ ​ ​ ​ Years ending December 31, ​ Amount For the three months ending December 31, 2020 $ 296 For the year ending December 31, 2021 ​ 1,183 For the year ending December 31, 2022 ​ 1,127 For the year ending December 31, 2023 ​ 1,048 For the year ending December 31, 2024 ​ 1,048 ​
Mortgage servicing rights
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 September 30, 2020: ​ ​ ​ ​ Years ending December 31, ​ Amount For the three months ending December 31, 2020 $ 396 For the year ending December 31, 2021 ​ 1,507 For the year ending December 31, 2022 ​ 1,215 For the year ending December 31, 2023 ​ 980 For the year ending December 31, 2024 ​ 790

Regulatory Capital (Tables)

Regulatory Capital (Tables)	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Regulatory Capital
Capital Ratio Requirements under Prompt Corrective Action or Other Regulatory Requirements	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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 10.6% ​ $ 673,622 N/A ​ ​ N/A 4.0% ​ $ 254,180 NBH Bank 9.2% ​ 586,217 5.0% ​ $ 317,605 4.0% ​ 254,084 Common equity tier 1 risk based capital: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ 14.3% ​ $ 673,622 ​ N/A ​ ​ N/A ​ 7.0% ​ $ 330,905 NBH Bank ​ 12.4% ​ ​ 586,217 ​ 6.5% ​ $ 307,342 ​ 7.0% ​ ​ 330,984 Tier 1 risk based capital ratio: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated 14.3% ​ $ 673,622 N/A ​ ​ N/A 8.5% ​ $ 401,813 NBH Bank 12.4% ​ 586,217 8.0% ​ $ 378,267 8.5% ​ 401,909 Total risk based capital ratio: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated 15.4% ​ $ 728,166 N/A ​ ​ N/A 10.5% ​ $ 496,358 NBH Bank 13.6% ​ 640,760 10.0% ​ $ 472,834 10.5% ​ 496,476	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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)	9 Months Ended
	Sep. 30, 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 three and nine months ended September 30, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months ended September 30, ​ For the nine months ended September 30, ​ 2020 2019 ​ 2020 2019 Non-interest income ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ In-scope of Topic 606: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Service charges and other fees ​ $ 4,246 ​ $ 5,112 ​ $ 12,453 ​ $ 14,822 Bank card fees ​ ​ 4,039 ​ ​ 3,752 ​ ​ 11,206 ​ ​ 10,946 Non-interest income (in-scope of Topic 606) ​ ​ 8,285 ​ ​ 8,864 ​ ​ 23,659 ​ ​ 25,768 Non-interest income (out-of-scope of Topic 606) ​ ​ 36,247 ​ ​ 15,895 ​ ​ 83,242 ​ ​ 36,702 Total non-interest income ​ $ 44,532 ​ $ 24,759 ​ $ 106,901 ​ $ 62,470 Non-interest expense ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ In-scope of Topic 606: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gain on OREO sales, net ​ $ 119 ​ $ 6,514 ​ $ 25 ​ $ 7,200 Total revenue in-scope of Topic 606 ​ $ 8,404 ​ $ 15,378 ​ $ 23,684 ​ $ 32,968 ​

Stock-based Compensation and _2

Stock-based Compensation and Benefits (Tables)	9 Months Ended
	Sep. 30, 2020
Stock-based Compensation and Benefits
Summary of outstanding stock options	The following table summarizes stock option activity for the nine months ended September 30, 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 225,936 ​ 23.13 ​ ​ ​ ​ ​ Exercised ​ (63,558) ​ ​ 19.77 ​ ​ ​ ​ ​ Forfeited (17,038) ​ 29.00 ​ ​ ​ ​ ​ Outstanding at September 30, 2020 802,454 ​ ​ 26.18 7.01 ​ ​ 2,474 Options exercisable at September 30, 2020 447,461 ​ ​ 25.35 5.43 ​ ​ 1,791 Options vested and expected to vest 764,282 ​ ​ 26.17 6.90 ​ ​ 2,390
Summary of Restricted Stock Activity	The following table summarizes restricted stock and performance stock unit activity during the nine months ended September 30, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Weighted ​ ​ Restricted ​ average grant- ​ Performance ​ ​ average grant- ​ ​ stock shares ​ date fair value ​ stock units ​ ​ date fair value Unvested at December 31, 2019 ​ 122,198 ​ $ 34.19 ​ 158,874 ​ $ 31.19 Granted ​ 120,132 ​ ​ 23.58 ​ 68,498 ​ ​ 26.74 Net adjustment due to performance ​ — ​ ​ — ​ 17,852 ​ ​ 33.22 Vested ​ (53,995) ​ ​ 34.40 ​ (53,540) ​ ​ 33.22 Forfeited ​ (9,502) ​ ​ 29.94 ​ (6,032) ​ ​ 29.37 Unvested at September 30, 2020 ​ 178,833 ​ $ 27.22 ​ 185,652 ​ $ 29.22

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 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 the three and nine months ended September 30, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months ended ​ For the nine months ended ​ September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 Net income ​ $ 27,893 ​ $ 21,642 ​ $ 61,422 ​ $ 60,846 Less: income allocated to participating securities ​ (36) ​ (25) ​ (96) ​ (69) Income allocated to common shareholders ​ $ 27,857 ​ $ 21,617 ​ $ 61,326 ​ $ 60,777 Weighted average shares outstanding for basic earnings per common share ​ 30,756,116 ​ 31,281,970 ​ 30,881,325 ​ 31,133,982 Dilutive effect of equity awards ​ 168,107 ​ 227,029 ​ 189,672 ​ 403,352 Weighted average shares outstanding for diluted earnings per common share ​ 30,924,223 ​ 31,508,999 ​ 31,070,997 ​ 31,537,334 Basic earnings per share ​ $ 0.91 ​ $ 0.69 ​ $ 1.99 ​ $ 1.95 Diluted earnings per share ​ ​ 0.90 ​ ​ 0.69 ​ ​ 1.97 ​ ​ 1.93 ​

Derivatives (Tables)

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2020
Derivatives
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	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 September 30, 2020 and December 31, 2019. ​ Information about the valuation methods used to measure fair value is provided in note 16. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset derivatives fair value ​ ​ ​ Liability derivatives fair value ​ ​ Balance Sheet ​ September 30, ​ December 31, ​ Balance Sheet ​ September 30, ​ December 31, ​ location 2020 2019 Location 2020 2019 Derivatives designated as hedging instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate products Other assets ​ $ — ​ $ 1,171 Other liabilities ​ $ 45,279 ​ $ 13,537 Total derivatives designated as hedging instruments ​ ​ ​ $ — ​ $ 1,171 ​ ​ ​ $ 45,279 ​ $ 13,537 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives not designated as hedging instruments: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate products Other assets ​ $ 21,287 ​ $ 9,004 Other liabilities ​ $ 21,371 ​ $ 9,021 Interest rate lock commitments ​ Other assets ​ ​ 11,769 ​ ​ 1,499 ​ Other liabilities ​ ​ 440 ​ ​ 141 Forward contracts ​ Other assets ​ ​ 191 ​ ​ 16 ​ Other liabilities ​ ​ 1,006 ​ ​ 299 Total derivatives not designated as hedging instruments ​ ​ ​ $ 33,247 ​ $ 10,519 ​ ​ ​ $ 22,817 ​ $ 9,461
Derivative Instruments, Gain (Loss)	The tables below present the effect of the Company’s derivative financial instruments in the consolidated statements of operations for the three and nine months ended September 30, 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 three months ended September 30, ​ For the nine months ended September 30, hedging relationships derivatives 2020 2019 2020 2019 Interest rate products Interest and fees on loans ​ $ 5,043 ​ $ 5,809 ​ $ 1,310 ​ $ (11,791) Total ​ ​ ​ $ 5,043 ​ $ 5,809 ​ $ 1,310 ​ $ (11,791) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Location of gain (loss) ​ Amount of (loss) gain recognized in income on hedged items ​ ​ recognized in income on ​ For the three months ended September 30, ​ For the nine months ended September 30, Hedged items hedged items 2020 2019 2020 2019 Interest rate products Interest and fees on loans ​ $ (4,993) $ (3,313) ​ $ (2,869) $ 11,604 Total ​ ​ ​ $ (4,993) $ (3,313) ​ $ (2,869) $ 11,604 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Location of gain (loss) ​ Amount of gain (loss) recognized in income on derivatives Derivatives not designated ​ recognized in income on ​ For the three months ended September 30, ​ For the nine months ended September 30, as hedging instruments derivatives 2020 2019 2020 2019 Interest rate products Other non-interest expense $ 8 $ (198) ​ $ (65) $ (761) Interest rate lock commitments ​ Mortgage banking income ​ ​ 3,243 ​ ​ 522 ​ ​ 14,174 ​ ​ 2,290 Forward contracts ​ Mortgage banking income ​ ​ 1,558 ​ ​ 348 ​ ​ (532) ​ ​ 49 Total ​ ​ $ 4,809 $ 672 ​ $ 13,577 $ 1,578 ​

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies
Schedule of Total Unfunded Commitments	Total unfunded commitments at September 30, 2020 and December 31, 2019 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 December 31, 2019 Commitments to fund loans ​ $ 280,496 ​ $ 249,914 Unfunded commitments under lines of credit ​ 557,464 ​ 600,407 Commercial and standby letters of credit ​ 8,862 ​ 11,929 Total unfunded commitments ​ $ 846,822 ​ $ 862,250
Schedule of Repurchase Reserve	The following table summarizes mortgage repurchase reserve activity for the periods presented: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the three months ended September 30, ​ For the nine months ended September 30, ​ ​ 2020 ​ 2019 ​ 2020 ​ 2019 Beginning balance ​ $ 2,725 ​ $ 2,633 ​ $ 2,589 ​ $ 3,286 Provision charged to (released from) operating expense, net ​ ​ 285 ​ ​ (111) ​ ​ 604 ​ ​ (639) Charge-offs ​ ​ (214) ​ ​ (24) ​ ​ (397) ​ ​ (149) Ending balance ​ $ 2,796 ​ $ 2,498 ​ $ 2,796 ​ $ 2,498

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
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 September 30, 2020 and December 31, 2019 on the consolidated statements of financial condition utilizing the hierarchy structure described above: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 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 ​ $ — ​ $ 92,892 ​ $ — ​ $ 92,892 Other residential MBS issued or guaranteed by U.S. Government agencies or sponsored enterprises ​ — ​ 476,650 ​ — ​ 476,650 Municipal securities ​ ​ — ​ ​ 394 ​ ​ — ​ ​ 394 Corporate debt ​ ​ — ​ 2,003 ​ — ​ 2,003 Loans held for sale ​ — ​ 273,003 ​ — ​ 273,003 Interest rate swap derivatives ​ — ​ 21,287 ​ — ​ 21,287 Mortgage banking derivatives ​ ​ — ​ ​ — ​ ​ 11,960 ​ ​ 11,960 Total assets at fair value ​ $ — ​ $ 866,229 ​ $ 11,960 ​ $ 878,189 Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap derivatives ​ $ — ​ $ 66,650 ​ $ — ​ $ 66,650 Mortgage banking derivatives ​ ​ — ​ ​ — ​ ​ 1,446 ​ ​ 1,446 Total liabilities at fair value ​ $ — ​ $ 66,650 ​ $ 1,446 ​ $ 68,096 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 the nine months ended September 30, 2020: ​ ​ ​ ​ ​ ​ ​ Mortgage banking ​ ​ ​ derivatives, net Balance at December 31, 2019 ​ $ 1,075 Gain included in earnings, net ​ ​ 13,642 Fees and costs included in earnings, net ​ (4,203) Balance at September 30, 2020 ​ $ 10,514 ​
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 during the nine months ended September 30, 2020 and 2019: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2020 ​ ​ Total ​ Losses from fair value changes Individually evaluated loans ​ $ 33,603 ​ $ 1,969 Other real estate owned ​ 4,590 ​ 423 Premises and equipment ​ 8,024 ​ ​ 1,631 Mortgage servicing rights ​ 7,173 ​ 847 Total ​ $ 53,390 ​ $ 4,870 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ September 30, 2019 ​ ​ Total ​ Losses from fair value changes Individually evaluated loans ​ $ 37,002 ​ $ 7,571 Other real estate owned ​ 7,904 ​ 872 Premises and equipment ​ 3,385 ​ ​ 898 Mortgage servicing rights ​ ​ 2,879 ​ ​ 453 Total ​ $ 51,170 ​ $ 9,794 ​

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	The fair value of financial instruments at September 30, 2020 and December 31, 2019 are set forth below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Level in fair value September 30, 2020 December 31, 2019 ​ ​ measurement ​ Carrying ​ Estimated ​ Carrying ​ Estimated ​ ​ hierarchy ​ amount fair value amount fair value ASSETS ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and cash equivalents Level 1 ​ $ 445,103 ​ $ 445,103 ​ $ 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 ​ 92,892 ​ 92,892 ​ 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 ​ 476,650 ​ 476,650 ​ 542,037 ​ 542,037 Municipal securities available-for-sale ​ Level 2 ​ ​ 394 ​ ​ 394 ​ ​ 372 ​ ​ 372 Municipal securities available-for-sale ​ Level 3 ​ ​ 115 ​ ​ 115 ​ ​ 115 ​ ​ 115 Corporate debt ​ Level 2 ​ ​ 2,003 ​ ​ 2,003 ​ ​ — ​ ​ — 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 ​ 250,790 ​ 255,032 ​ 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 ​ 69,211 ​ 69,688 ​ 55,324 ​ 54,971 Non-marketable securities ​ Level 2 ​ ​ 29,598 ​ ​ 29,598 ​ ​ 29,751 ​ ​ 29,751 Loans receivable Level 3 ​ 4,556,121 ​ 4,723,757 ​ 4,415,406 ​ 4,481,209 Loans held for sale Level 2 ​ 273,003 ​ 273,003 ​ 117,444 ​ 117,444 Accrued interest receivable Level 2 ​ 22,852 ​ 22,852 ​ 19,157 ​ 19,157 Interest rate swap derivatives Level 2 ​ 21,287 ​ 21,287 ​ 10,175 ​ 10,175 Mortgage banking derivatives ​ Level 3 ​ ​ 11,960 ​ ​ 11,960 ​ ​ 1,515 ​ ​ 1,515 LIABILITIES ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deposit transaction accounts Level 2 ​ 4,589,394 ​ 4,589,394 ​ 3,678,979 ​ 3,678,979 Time deposits Level 2 ​ 1,027,066 ​ 1,036,192 ​ 1,058,153 ​ 1,058,354 Securities sold under agreements to repurchase Level 2 ​ 23,904 ​ 23,904 ​ 56,935 ​ 56,935 Federal Home Loan Bank advances Level 2 ​ — ​ — ​ 207,675 ​ 207,890 Accrued interest payable Level 2 ​ 8,219 ​ 8,219 ​ 9,328 ​ 9,328 Interest rate swap derivatives ​ Level 2 ​ ​ 66,650 ​ ​ 66,650 ​ 22,558 ​ 22,558 Mortgage banking derivatives Level 3 ​ 1,446 ​ 1,446 ​ ​ 440 ​ ​ 440

Basis of Presentation (Details)

Basis of Presentation (Details)	9 Months Ended
	Sep. 30, 2020loanitem
Basis of Presentation
Number of full service banking offices | item	100
Number of primary loan segment	4
Number of loan classes	11

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 202,238		$ 164,082
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		$ 0

Investment Securities - Narrati

Investment Securities - Narrative (Details) $ in Thousands	Sep. 30, 2020USD ($)security	Dec. 31, 2019USD ($)security
Investment securities total	$ 900,000	$ 800,000
Amortized cost	559,634	638,009
Available-for-sale securities	572,523	638,249
Held-to-maturity securities	$ 320,001	$ 182,884
Number of securities | security	12	67
Fair value of available-for-sale securities in an unrealized loss position	$ 29,386	$ 308,569
Pledged as collateral for line of credit at the Federal Home Loan Bank	0	13,600
Fair value of collateral	$ 4,200	$ 7,000
Mortgage-backed securities as percentage of available-for-sale investment portfolio	100.00%	100.00%
Fair value of available-for-sale investment securities pledged as collateral	$ 401,600	$ 352,300
Number of held-to-maturity securities in unrealized loss positions | security	6	13
Fair value of held-to-maturity securities in an unrealized loss position	$ 59,053	$ 43,295
Held-to-maturity investment securities pledged as collateral	146,300	144,200
Held-to-maturity investment securities held as collateral	0	4,000
Investment Securities Available-For-Sale [Member]
Accrued interest receivable	1,600	1,500
Held-to-maturity Securities [Member]
Accrued interest receivable	600	500
Municipal securities maturing within one to five years [Member]
Amortized cost	500
Available-for-sale securities	200
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	Sep. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 559,634	$ 638,009
Gross unrealized gains	13,001	5,315
Gross unrealized losses	(112)	(5,075)
Investment securities available-for-sale (at fair value)	572,523	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	90,022	93,770
Gross unrealized gains	2,870	1,497
Gross unrealized losses		(11)
Investment securities available-for-sale (at fair value)	92,892	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	466,648	543,275
Gross unrealized gains	10,114	3,818
Gross unrealized losses	(112)	(5,056)
Investment securities available-for-sale (at fair value)	476,650	542,037
Municipal [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	495	495
Gross unrealized gains	14
Gross unrealized losses		(8)
Investment securities available-for-sale (at fair value)	509	487
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	2,000
Gross unrealized gains	3
Investment securities available-for-sale (at fair value)	2,003
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	Sep. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months Fair Value	$ 26,992	$ 52,396
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(90)	(288)
12 months or more, Fair Value	2,394	256,173
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(22)	(4,787)
Total, Fair Value	29,386	308,569
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	(112)	(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		10,413
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(7)
12 months or more, Fair Value		1,421
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		(4)
Total, Fair Value		11,834
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss		(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	26,992	41,983
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(90)	(281)
12 months or more, Fair Value	2,394	254,380
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(22)	(4,775)
Total, Fair Value	29,386	296,363
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (112)	(5,056)
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	Sep. 30, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities	$ 320,001	$ 182,884
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	4,835	1,321
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(116)	(464)
Fair value	324,720	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	250,790	127,560
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	4,358	1,239
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(116)	(29)
Fair value	255,032	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	69,211	55,324
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	477	82
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		(435)
Fair value	$ 69,688	$ 54,971

Investment Securities - Summa_4

Investment Securities - Summary of Held-to-Maturity Securities, Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Fair Value, Less than 12 months	$ 59,053	$ 14,403
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(116)	(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	59,053	43,295
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	(116)	(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	59,053	10,478
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(116)	(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	59,053	10,816
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (116)	(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		3,925
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		(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		32,479
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss		$ (435)

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	Sep. 30, 2020	Dec. 31, 2019
Loans [Line Items]
Fees and cost related to loans	$ 22,300	$ 21,900
Total Loans	$ 4,556,121	$ 4,415,406
% of Total	100.00%	100.00%
Commercial Portfolio Segment [Member]
Loans [Line Items]
Total Loans	$ 3,217,406	$ 2,992,307
% of Total	70.60%	67.80%
Commercial Portfolio Segment [Member] | Paycheck Protection Program Loans [Member]
Loans [Line Items]
Total Loans	$ 348,300
Commercial Real Estate Portfolio Segment [Member]
Loans [Line Items]
Total Loans	$ 617,087	$ 630,906
% of Total	13.50%	14.30%
Residential Portfolio Segment [Member]
Loans [Line Items]
Total Loans	$ 700,927	$ 770,417
% of Total	15.40%	17.40%
Consumer Loan [Member]
Loans [Line Items]
Total Loans	$ 20,701	$ 21,776
% of Total	0.50%	0.50%

Loans - Loan Delinquency (Detai

Loans - Loan Delinquency (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Loans [Line Items]
Non- accrual loans	$ 18,882	$ 21,748
Total past due and non-accrual	25,630	29,760
Current	4,530,491	4,385,646
Total	4,556,121	4,415,406
Non-accrual loans with a related allowance	10,676
Non-accrual loans with no related allowance	8,206
Interest income recognized non-accrual	0
Commercial Portfolio Segment [Member]
Loans [Line Items]
Non- accrual loans	11,485	12,911
Total past due and non-accrual	14,772	17,683
Current	3,202,634	2,974,624
Total	3,217,406	2,992,307
Non-accrual loans with a related allowance	5,475
Non-accrual loans with no related allowance	6,010
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Non- accrual loans	7,395	10,330
Total past due and non-accrual	8,365	13,461
Current	1,592,426	1,398,070
Total	1,600,791	1,411,531
Non-accrual loans with a related allowance	4,664
Non-accrual loans with no related allowance	2,731
Commercial Portfolio Segment [Member] | Municipal [Member]
Loans [Line Items]
Total past due and non-accrual		226
Current	883,641	837,300
Total	883,641	837,526
Commercial Portfolio Segment [Member] | Owner-Occupied [Member]
Loans [Line Items]
Non- accrual loans	3,539	2,264
Total past due and non-accrual	5,384	3,489
Current	511,031	486,633
Total	516,415	490,122
Non-accrual loans with a related allowance	633
Non-accrual loans with no related allowance	2,906
Commercial Portfolio Segment [Member] | Food and Agriculture [Member]
Loans [Line Items]
Non- accrual loans	551	317
Total past due and non-accrual	1,023	507
Current	215,536	252,621
Total	216,559	253,128
Non-accrual loans with a related allowance	178
Non-accrual loans with no related allowance	373
Commercial Real Estate Portfolio Segment [Member]
Loans [Line Items]
Non- accrual loans	28	459
Total past due and non-accrual	2,661	1,149
Current	614,426	629,757
Total	617,087	630,906
Non-accrual loans with a related allowance	28
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans [Line Items]
Current	77,361	77,733
Total	77,361	77,733
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member]
Loans [Line Items]
Non- accrual loans	8	416
Total past due and non-accrual	8	603
Current	26,003	26,276
Total	26,011	26,879
Non-accrual loans with a related allowance	8
Commercial Real Estate Portfolio Segment [Member] | Multifamily [Member]
Loans [Line Items]
Current	69,925	55,808
Total	69,925	55,808
Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member]
Loans [Line Items]
Non- accrual loans	20	43
Total past due and non-accrual	2,653	546
Current	441,137	469,940
Total	443,790	470,486
Non-accrual loans with a related allowance	20
Residential Portfolio Segment [Member]
Loans [Line Items]
Non- accrual loans	7,322	8,328
Total past due and non-accrual	8,143	10,762
Current	692,784	759,655
Total	700,927	770,417
Non-accrual loans with a related allowance	5,126
Non-accrual loans with no related allowance	2,196
Residential Portfolio Segment [Member] | Senior lien
Loans [Line Items]
Non- accrual loans	6,625	7,597
Total past due and non-accrual	7,292	9,707
Current	611,971	668,955
Total	619,263	678,662
Non-accrual loans with a related allowance	4,429
Non-accrual loans with no related allowance	2,196
Residential Portfolio Segment [Member] | Junior lien
Loans [Line Items]
Non- accrual loans	697	731
Total past due and non-accrual	851	1,055
Current	80,813	90,700
Total	81,664	91,755
Non-accrual loans with a related allowance	697
Consumer Loan [Member]
Loans [Line Items]
Non- accrual loans	47	50
Total past due and non-accrual	54	166
Current	20,647	21,610
Total	20,701	21,776
Non-accrual loans with a related allowance	47
30-89 Days Past Due
Loans [Line Items]
Past due loans	6,587	6,350
30-89 Days Past Due | Commercial Portfolio Segment [Member]
Loans [Line Items]
Past due loans	3,287	3,263
30-89 Days Past Due | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans [Line Items]
Past due loans	970	2,252
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	1,845	595
30-89 Days Past Due | Commercial Portfolio Segment [Member] | Food and Agriculture [Member]
Loans [Line Items]
Past due loans	472	190
30-89 Days Past Due | Commercial Real Estate Portfolio Segment [Member]
Loans [Line Items]
Past due loans	2,633	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	2,633	438
30-89 Days Past Due | Residential Portfolio Segment [Member]
Loans [Line Items]
Past due loans	660	2,346
30-89 Days Past Due | Residential Portfolio Segment [Member] | Senior lien
Loans [Line Items]
Past due loans	506	2,101
30-89 Days Past Due | Residential Portfolio Segment [Member] | Junior lien
Loans [Line Items]
Past due loans	154	245
30-89 Days Past Due | Consumer Loan [Member]
Loans [Line Items]
Past due loans	7	116
Greater than 90 Days Past Due
Loans [Line Items]
Past due loans	161	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	161	88
Greater than 90 Days Past Due | Residential Portfolio Segment [Member] | Senior lien
Loans [Line Items]
Past due loans	$ 161	9
Greater than 90 Days Past Due | Residential Portfolio Segment [Member] | Junior lien
Loans [Line Items]
Past due loans		$ 79

Loans - Carrying Value of Loan

Loans - Carrying Value of Loan Portfolio by Segment and Credit Quality Indicator (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 876,324
2019		$ 714,778
2018			$ 598,425
2017				$ 536,953
2016					$ 365,473
Prior	772,511
Revolving Loans Amortized Cost Basis	687,220
Revolving Loans Converted to Term	4,437
Total	4,556,121	4,415,406
Commercial Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	696,552
2019		459,410
2018			493,671
2017				338,203
2016					203,754
Prior	430,615
Revolving Loans Amortized Cost Basis	591,672
Revolving Loans Converted to Term	3,529
Total	3,217,406	2,992,307
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	489,289
2019		234,605
2018			224,356
2017				116,572
2016					22,234
Prior	26,104
Revolving Loans Amortized Cost Basis	484,322
Revolving Loans Converted to Term	3,309
Total	1,600,791	1,411,531
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	488,391
2019		231,994
2018			217,190
2017				98,442
2016					16,130
Prior	19,820
Revolving Loans Amortized Cost Basis	478,080
Revolving Loans Converted to Term	2,290
Total	1,552,337
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	871
2019		1,327
2018			5,849
2017				5,018
2016					6,098
Prior	824
Revolving Loans Amortized Cost Basis	4,073
Revolving Loans Converted to Term	1,019
Total	25,079
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	27
2019		1,284
2018			1,317
2017				12,709
2016					6
Prior	4,786
Revolving Loans Amortized Cost Basis	2,145
Total	22,274
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2017				403
Prior	674
Revolving Loans Amortized Cost Basis	24
Total	1,101
Commercial Portfolio Segment [Member] | Owner-Occupied [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	69,084
2019		119,639
2018			104,594
2017				55,123
2016					39,119
Prior	127,407
Revolving Loans Amortized Cost Basis	1,396
Revolving Loans Converted to Term	53
Total	516,415	490,122
Commercial Portfolio Segment [Member] | Owner-Occupied [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	67,503
2019		114,301
2018			95,751
2017				54,320
2016					33,105
Prior	103,895
Revolving Loans Amortized Cost Basis	1,396
Revolving Loans Converted to Term	53
Total	470,324
Commercial Portfolio Segment [Member] | Owner-Occupied [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,581
2019		2,996
2018			2,612
2017				548
2016					5,912
Prior	19,496
Total	33,145
Commercial Portfolio Segment [Member] | Owner-Occupied [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2019		2,342
2018			6,231
2017				255
2016					102
Prior	4,016
Total	12,946
Commercial Portfolio Segment [Member] | Food and Agriculture [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	21,695
2019		9,417
2018			31,671
2017				7,674
2016					9,874
Prior	30,111
Revolving Loans Amortized Cost Basis	105,950
Revolving Loans Converted to Term	167
Total	216,559	253,128
Commercial Portfolio Segment [Member] | Food and Agriculture [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	21,695
2019		9,417
2018			31,671
2017				7,366
2016					9,874
Prior	28,770
Revolving Loans Amortized Cost Basis	105,873
Revolving Loans Converted to Term	167
Total	214,833
Commercial Portfolio Segment [Member] | Food and Agriculture [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	370
Total	370
Commercial Portfolio Segment [Member] | Food and Agriculture [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2017				308
Prior	970
Revolving Loans Amortized Cost Basis	69
Total	1,347
Commercial Portfolio Segment [Member] | Food and Agriculture [Member] | Doubtful [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	1
Revolving Loans Amortized Cost Basis	8
Total	9
Commercial Portfolio Segment [Member] | Municipal [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	116,484
2019		95,749
2018			133,050
2017				158,834
2016					132,527
Prior	246,993
Revolving Loans Amortized Cost Basis	4
Total	883,641	837,526
Commercial Portfolio Segment [Member] | Municipal [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	116,484
2019		95,749
2018			133,050
2017				158,834
2016					132,527
Prior	246,993
Revolving Loans Amortized Cost Basis	4
Total	883,641
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	71,360
2019		150,261
2018			53,095
2017				140,002
2016					56,919
Prior	138,934
Revolving Loans Amortized Cost Basis	6,467
Revolving Loans Converted to Term	49
Total	617,087	630,906
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	14,061
2019		37,496
2018			17,144
2017				4,097
Revolving Loans Amortized Cost Basis	4,563
Total	77,361	77,733
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	13,778
2019		37,496
2018			17,144
2017				4,097
Revolving Loans Amortized Cost Basis	4,563
Total	77,078
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	283
Total	283
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,781
2019		2,030
2018			1,951
2017				8,538
2016					4,569
Prior	5,099
Revolving Loans Amortized Cost Basis	43
Total	26,011	26,879
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,781
2019		2,030
2018			1,951
2017				8,503
2016					4,569
Prior	4,653
Revolving Loans Amortized Cost Basis	43
Total	25,530
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2017				35
Prior	253
Total	288
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	193
Total	193
Commercial Real Estate Portfolio Segment [Member] | Multifamily [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	21,492
2019		13,743
2018			138
2017				7,273
2016					19,516
Prior	7,763
Total	69,925	55,808
Commercial Real Estate Portfolio Segment [Member] | Multifamily [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	21,492
2019		13,743
2018			138
2017				7,273
2016					19,516
Prior	5,380
Total	67,542
Commercial Real Estate Portfolio Segment [Member] | Multifamily [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	2,383
Total	2,383
Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	32,026
2019		96,992
2018			33,862
2017				120,094
2016					32,834
Prior	126,072
Revolving Loans Amortized Cost Basis	1,861
Revolving Loans Converted to Term	49
Total	443,790	470,486
Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	32,026
2019		96,992
2018			27,884
2017				110,225
2016					28,868
Prior	121,540
Revolving Loans Amortized Cost Basis	1,761
Revolving Loans Converted to Term	49
Total	419,345
Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2018			5,912
2017				9,869
2016					3,966
Prior	3,698
Revolving Loans Amortized Cost Basis	100
Total	23,545
Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2018			66
Prior	834
Total	900
Residential Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	99,217
2019		100,558
2018			49,573
2017				58,112
2016					104,359
Prior	202,222
Revolving Loans Amortized Cost Basis	86,051
Revolving Loans Converted to Term	835
Total	700,927	770,417
Residential Portfolio Segment [Member] | Senior lien
Financing Receivable, Credit Quality Indicator [Line Items]
2020	95,486
2019		95,677
2018			46,083
2017				55,953
2016					102,869
Prior	197,491
Revolving Loans Amortized Cost Basis	25,377
Revolving Loans Converted to Term	327
Total	619,263	678,662
Residential Portfolio Segment [Member] | Senior lien | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	95,390
2019		95,318
2018			46,063
2017				54,423
2016					102,307
Prior	192,309
Revolving Loans Amortized Cost Basis	25,377
Revolving Loans Converted to Term	327
Total	611,514
Residential Portfolio Segment [Member] | Senior lien | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	452
Total	452
Residential Portfolio Segment [Member] | Senior lien | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	96
2019		359
2018			20
2017				1,530
2016					562
Prior	4,730
Total	7,297
Residential Portfolio Segment [Member] | Junior lien
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,731
2019		4,881
2018			3,490
2017				2,159
2016					1,490
Prior	4,731
Revolving Loans Amortized Cost Basis	60,674
Revolving Loans Converted to Term	508
Total	81,664	91,755
Residential Portfolio Segment [Member] | Junior lien | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,731
2019		4,767
2018			3,387
2017				1,963
2016					1,433
Prior	4,397
Revolving Loans Amortized Cost Basis	60,327
Revolving Loans Converted to Term	508
Total	80,513
Residential Portfolio Segment [Member] | Junior lien | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Prior	21
Revolving Loans Amortized Cost Basis	347
Total	368
Residential Portfolio Segment [Member] | Junior lien | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2019		114
2018			103
2017				196
2016					57
Prior	313
Total	783
Consumer Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	9,195
2019		4,549
2018			2,086
2017				636
2016					441
Prior	740
Revolving Loans Amortized Cost Basis	3,030
Revolving Loans Converted to Term	24
Total	20,701	21,776
Consumer Loan [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	9,195
2019		4,529
2018			$ 2,086
2017				$ 636
2016					422
Prior	732
Revolving Loans Amortized Cost Basis	3,030
Revolving Loans Converted to Term	24
Total	20,654
Consumer Loan [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2019		$ 20
2016					$ 19
Prior	8
Total	$ 47

Loans - Impaired Loans - Averag

Loans - Impaired Loans - Average Recorded Investment and Interest Income Recognized (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)
Receivables [Abstract]
Impaired Financing Receivable, Interest Income, Cash Basis Method	$ 0

Loans - Collateral Dependent Lo

Loans - Collateral Dependent Loans (Details) $ in Thousands	Sep. 30, 2020USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	$ 24,455
Management evaluated loan with amortized cost basis	250
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	19,515
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	12,377
Commercial Portfolio Segment [Member] | Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	6,680
Commercial Portfolio Segment [Member] | Food and Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	458
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	2,744
Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	253
Commercial Real Estate Portfolio Segment [Member] | Commercial Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	1,935
Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	556
Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	2,196
Residential Portfolio Segment [Member] | Senior lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	2,196
Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	19,644
Real Estate [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	14,704
Real Estate [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	7,936
Real Estate [Member] | Commercial Portfolio Segment [Member] | Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	6,396
Real Estate [Member] | Commercial Portfolio Segment [Member] | Food and Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	372
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	2,744
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Acquisition/Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	253
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	1,935
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member] | Non Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	556
Real Estate [Member] | Residential Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	2,196
Real Estate [Member] | Residential Portfolio Segment [Member] | Senior lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	2,196
Equipment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	4,811
Equipment [Member] | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	4,811
Equipment [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	4,441
Equipment [Member] | Commercial Portfolio Segment [Member] | Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	284
Equipment [Member] | Commercial Portfolio Segment [Member] | Food and Agriculture [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized Cost Basis	$ 86

Loans - Troubled Debt Restructu

Loans - Troubled Debt Restructuring and Loans Accounted for Under ASC Topic 310-30 Narratives (Details)	3 Months Ended	9 Months Ended	21 Months Ended
	Sep. 30, 2020USD ($)	Sep. 30, 2020USD ($)itemloan	Sep. 30, 2020USD ($)loan	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
Loans receivable	$ 4,495,142,000	$ 4,495,142,000	$ 4,495,142,000	$ 4,376,342,000
TDR's modified within the past year that defaulted on their restructured terms | loan			0
ASC 310-30
Debt Instrument [Line Items]
Amortized cost basis of restructed loans		$ 4,400,000
COVID-19
Debt Instrument [Line Items]
Number of restructured loans not identified as TDRs	20	483
Loans modified and not identified as TDRs	$ 7,100,000	$ 499,500,000
Loan modifications and not identified as TDRs, resumed payment of principal and interest	334,300,000	334,300,000	$ 334,300,000
Loans receivable	$ 165,200,000	$ 165,200,000	$ 165,200,000
Outstanding Notes Receivable Balance Granted Relief (As a Percent)	3.60%	3.60%	3.60%
Financing Receivable Not Identified As Troubled Debt Restructuring, Percent		11.60%
Financing Receibable Second Modifications Percent	84.00%	84.00%	84.00%
COVID-19 | Contractual Interest Rate Reduction [Member]
Debt Instrument [Line Items]
Loans modified and not identified as TDRs		$ 155,100,000
COVID-19 | Payment Deferral [Member]
Debt Instrument [Line Items]
Loans modified and not identified as TDRs		$ 10,100,000
Troubled Debt Restructurings [Member]
Debt Instrument [Line Items]
Number of restructured loans	7	21
Amortized cost basis of restructed loans	$ 800,000	$ 18,600,000

Loans - Additional Information

Loans - Additional Information Related to Accruing TDR's (Details) - Accruing TDR [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Loans [Line Items]
Recorded Investment	$ 21,786	$ 6,885
Average year-to- date recorded investment	22,183	7,138
Unpaid principal balance	25,158	7,112
Unfunded commitments to fund TDRs	169	12
Commercial Portfolio Segment [Member]
Loans [Line Items]
Recorded Investment	14,903	5,615
Average year-to- date recorded investment	15,394	5,788
Unpaid principal balance	15,527	5,714
Unfunded commitments to fund TDRs	157
Commercial Real Estate Portfolio Segment [Member]
Loans [Line Items]
Recorded Investment	5,076	141
Average year-to- date recorded investment	4,938	172
Unpaid principal balance	7,001	192
Residential Portfolio Segment [Member]
Loans [Line Items]
Recorded Investment	1,807	1,129
Average year-to- date recorded investment	1,851	1,178
Unpaid principal balance	2,630	1,206
Unfunded commitments to fund TDRs	$ 12	$ 12

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	Sep. 30, 2020	Dec. 31, 2019
Loans [Line Items]
Carrying Value of Non - Accruing TDR's	$ 4,659	$ 4,854
Commercial Portfolio Segment [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR's	1,590	1,891
Commercial Real Estate Portfolio Segment [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR's		410
Residential Portfolio Segment [Member]
Loans [Line Items]
Carrying Value of Non - Accruing TDR's	$ 3,069	$ 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	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019	Mar. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 60,465		$ 39,064	$ 35,692
Charge-offs	(619)	$ (7,101)	(1,969)	(7,662)
Recoveries	133	39	515	217
Provision	1,000	5,690	17,533	10,463
Ending balance	60,979	38,710	60,979	38,710
Total Loans					$ 4,556,121	$ 4,415,406
Collective related allowance for loan losses for impaired loans	60,465	38,710	39,064	38,710	60,979	39,064	$ 40,082
Total Loans					4,556,121	4,415,406
Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance	5,836		5,836
Collective related allowance for loan losses for impaired loans	5,836		5,836		5,836
Commercial Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	33,142		30,442	27,137
Charge-offs	(499)	(6,760)	(1,411)	(6,841)
Recoveries	104	2	370	31
Provision	(1,576)	5,730	3,069	9,468
Ending balance	31,171	29,795	31,171	29,795
Total Loans					3,217,406	2,992,307
Collective related allowance for loan losses for impaired loans	31,171	29,795	31,171	29,795	31,171	30,442	30,823
Total Loans					3,217,406	2,992,307
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance	(1,299)		(1,299)
Collective related allowance for loan losses for impaired loans	(1,299)		(1,299)		(1,299)
Commercial Real Estate Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	12,314		4,850	4,406
Charge-offs		(1)		(1)
Recoveries				11
Provision	1,467	(11)	7,265	639
Ending balance	13,781	5,055	13,781	5,055
Total Loans					617,087	630,906
Collective related allowance for loan losses for impaired loans	13,781	5,055	4,850	5,055	13,781	4,850	5,067
Total Loans					617,087	630,906
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		1,666
Collective related allowance for loan losses for impaired loans	1,666		1,666		1,666
Residential Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	14,525		3,468	3,800
Charge-offs	(16)	(77)	(56)	(124)
Recoveries	4	3	24	32
Provision	1,000	(214)	6,763	(145)
Ending balance	15,513	3,563	15,513	3,563
Total Loans					700,927	770,417
Collective related allowance for loan losses for impaired loans	15,513	3,563	3,468	3,563	15,513	3,468	3,851
Total Loans					700,927	770,417
Residential Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance	5,314		5,314
Collective related allowance for loan losses for impaired loans	5,314		5,314		5,314
Consumer Loan [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	484		304	349
Charge-offs	(104)	(263)	(502)	(696)
Recoveries	25	34	121	143
Provision	109	185	436	501
Ending balance	514	297	514	297
Total Loans					20,701	21,776
Collective related allowance for loan losses for impaired loans	514	$ 297	514	$ 297	514	304	$ 341
Total Loans					20,701	21,776
Consumer Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Ending balance	155		155
Collective related allowance for loan losses for impaired loans	$ 155		$ 155		155
Non Owner-Occupied [Member] | Commercial Real Estate Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Total Loans					443,790	470,486
Total Loans					443,790	470,486
Food and Agriculture [Member] | Commercial Portfolio Segment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Total Loans					216,559	253,128
Total Loans					$ 216,559	$ 253,128

Allowance for Credit Losses - N

Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Credit Loss [Abstract]
Charge-offs, net	$ 0.5	$ 5.7	$ 1.5	$ 10.5
Accrued interest receivable	$ 20.6		$ 20.6		$ 17.2

Other Real Estate Owned - Summa

Other Real Estate Owned - Summary of Activity in OREO Balances (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Other Real Estate [Roll Forward]
Beginning balance	$ 4,590	$ 7,904
Transfers from loan portfolio, at fair value	1,186	2,488
Impairments	(423)	(872)
Sales	(3,473)	(4,308)
Ending balance	$ 7,300	$ 10,596

Other Real Estate Owned - Narra

Other Real Estate Owned - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Other Real Estate Owned
OREO sales			$ 3,473,000	$ 4,308,000
OREO Sold NBV	$ 3,500,000	$ 4,300,000	3,500,000	4,300,000
Gain (loss) on OREO sales, net	$ 119,000	$ 6,514,000	$ 25,000	$ 7,200,000

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Narrative (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020USD ($)item	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)item	Sep. 30, 2019USD ($)	Dec. 31, 2019USD ($)
Goodwill and Intangible Assets
Goodwill acquired	$ 115,027,000		$ 115,027,000		$ 115,027,000
Goodwill Impairment			0		$ 0
Amortization of acquired identifiable intangibles	295,000	$ 295,000	887,000	$ 887,000
Mortgage loans serviced			985,300,000	334,500,000
Mortgage service fees	500,000	200,000	1,000,000	700,000
Core Deposits
Goodwill and Intangible Assets
Amortization of acquired identifiable intangibles	$ 300,000	$ 300,000	$ 900,000	900,000
Core Deposits | Minimum
Goodwill and Intangible Assets
Amortization period			7 years
Core Deposits | Maximum
Goodwill and Intangible Assets
Amortization period			10 years
Mortgage servicing rights
Goodwill and Intangible Assets
Amortization of acquired identifiable intangibles			$ 1,237,000	$ 578,000
Mortgage servicing rights | Measurement Input, Discount Rate [Member] | Minimum
Goodwill and Intangible Assets
Servicing assets measurement input (as a percent)	0.095	0.095	0.095	0.095
Mortgage servicing rights | Measurement Input, Discount Rate [Member] | Maximum
Goodwill and Intangible Assets
Servicing assets measurement input (as a percent)	0.105	0.105	0.105	0.105
Mortgage servicing rights | Measurement Input, Constant Prepayment Rate [Member] | Minimum
Goodwill and Intangible Assets
Servicing assets measurement input (as a percent)	0.180	0.179	0.180	0.179
Mortgage servicing rights | Measurement Input, Constant Prepayment Rate [Member] | Maximum
Goodwill and Intangible Assets
Servicing assets measurement input (as a percent)	0.218	0.267	0.218	0.267

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Carrying Amounts (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Core Deposits
Carrying amount of intangible assets
Gross carrying amount	$ 48,834	$ 48,834
Accumulated amortization	40,990	40,103
Net carrying amount	7,844	8,731
Mortgage servicing rights
Carrying amount of intangible assets
Net carrying amount	$ 7,173	$ 2,630	$ 2,551	$ 3,556

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Summary of Estimated Future Amortization Expense (Details) $ in Thousands	Sep. 30, 2020USD ($)
Core Deposits
Estimated future amortization expense
For the remainder of December 31, 2020	$ 296
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
Mortgage servicing rights
Estimated future amortization expense
For the remainder of December 31, 2020	396
For the years ending December 31, 2021	1,507
For the years ending December 31, 2022	1,215
For the years ending December 31, 2023	980
For the years ending December 31, 2024	$ 790

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Changes in Servicing Rights (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Changes in the mortgage servicing rights
Amortization	$ (295)	$ (295)	$ (887)	$ (887)
Mortgage servicing rights
Changes in the mortgage servicing rights
Beginning balance			2,630	3,556
Originations			6,627	26
Impairment			(847)	(453)
Amortization			(1,237)	(578)
Ending balance	7,173	2,551	7,173	2,551
Fair value of mortgage servicing rights	$ 7,653	$ 2,551	$ 7,653	$ 2,551

Borrowings - Narrative (Details

Borrowings - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]
Amount of repurchase agreements	$ 23.9		$ 23.9		$ 56.9
Fair value of collateral	4.2		4.2		7
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available	1,000		1,000
Loans pledged	1,300		1,300		1,500
Interest expense related to FHLB advances	0.1	$ 1.4	1.3	$ 4.8
Line of credit
Assets Sold under Agreements to Repurchase [Line Items]
FHLB advances	$ 0		$ 0		192.7
Term financing
Assets Sold under Agreements to Repurchase [Line Items]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Due Date, Last	2020		2020
FHLB advances	$ 15		$ 15
Interest rate range of FHLB advances	2.33%		2.33%
Federal Home Loan Bank of Des Moines [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Fair value of collateral	$ 0		$ 0		17.6
U.S. Treasury Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Fair value of collateral	$ 28.8		$ 28.8		$ 65.6

Regulatory Capital - Capital Ra

Regulatory Capital - Capital Ratio Requirements under Prompt Corrective Action or Other Regulatory Requirements (Details) $ in Thousands	9 Months Ended
	Sep. 30, 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	10.6	11
Common equity risk-based ratio	14.3	13.2
Risk-based capital Ratio	14.3	13.2
Total risk-based capital Ratio	15.4	14.1
Leverage Amount	$ 673,622	$ 640,440
Common equity risk-based amount	673,622	640,440
Risk-based capital amount	673,622	640,440
Total risk-based capital Amount	$ 728,166	$ 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	$ 254,180	$ 231,950
Required to be considered adequately capitalized common equity capital amount	330,905	405,912
Required to be considered adequately capitalized risk-based capital Amount	401,813	412,620
Required to be considered adequately capitalized Total risk-based capital Amount	$ 496,358	$ 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	12.4	10.9
Risk-based capital Ratio	12.4	10.9
Total risk-based capital Ratio	13.6	11.8
Leverage Amount	$ 586,217	$ 528,028
Common equity risk-based amount	586,217	528,028
Risk-based capital amount	586,217	528,028
Total risk-based capital Amount	$ 640,760	$ 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	10
Required to be considered well capitalized leverage Amount	$ 317,605	$ 289,926
Required to be considered well capitalized common equity capital amount	307,342	376,903
Required to be considered well capitalized risk-based capital Amount	378,267	387,701
Required to be considered well capitalized Total risk-based capital Amount	$ 472,834	$ 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	$ 254,084	$ 231,940
Required to be considered adequately capitalized common equity capital amount	330,984	405,896
Required to be considered adequately capitalized risk-based capital Amount	401,909	411,932
Required to be considered adequately capitalized Total risk-based capital Amount	$ 496,476	$ 508,857

Revenue from Contracts with C_3

Revenue from Contracts with Clients - Non-interest income (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue from Contracts with Clients
Loss (gain) on OREO sales, net	$ (119,000)	$ (6,514,000)	$ (25,000)	$ (7,200,000)
Service charges and other fees
Revenue from Contracts with Clients
Non-interest income	3,742,000	4,617,000	10,962,000	13,479,000
Bank card fees
Revenue from Contracts with Clients
Non-interest income	4,039,000	3,752,000	11,206,000	10,946,000
ASU 2014-09
Revenue from Contracts with Clients
Non-interest income	44,532,000	24,759,000	106,901,000	62,470,000
ASU 2014-09 | In-scope of Topic 606
Revenue from Contracts with Clients
Non-interest income	8,285,000	8,864,000	23,659,000	25,768,000
Loss (gain) on OREO sales, net	(119,000)	(6,514,000)	(25,000)	(7,200,000)
Total Revenue	8,404,000	15,378,000	23,684,000	32,968,000
ASU 2014-09 | In-scope of Topic 606 | Service charges and other fees
Revenue from Contracts with Clients
Non-interest income	4,246,000	5,112,000	12,453,000	14,822,000
ASU 2014-09 | In-scope of Topic 606 | Bank card fees
Revenue from Contracts with Clients
Non-interest income	4,039,000	3,752,000	11,206,000	10,946,000
ASU 2014-09 | Out-of-scope of Topic 606
Revenue from Contracts with Clients
Non-interest income	$ 36,247,000	$ 15,895,000	$ 83,242,000	$ 36,702,000

Stock-based Compensation and _3

Stock-based Compensation and Benefits - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 100,000	$ 200,000	$ 800,000	$ 500,000
Unrecognized compensation expense	900,000		$ 900,000
Unrecognized compensation cost, weighted-average period, years			1 year 3 months 18 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	700,000	700,000	$ 1,900,000	1,600,000
Awards granted (in shares)			120,132
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	2,600,000		$ 2,600,000
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	400,000	$ 500,000	$ 1,300,000	$ 1,200,000
Awards granted (in shares)			68,498
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	$ 3,100,000		$ 3,100,000
Unrecognized compensation cost, weighted-average period, years			1 year 10 months 24 days
Awards granted (in shares)			17,852
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	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding Options, beginning	657,114
Granted, Options	225,936
Exercised, Options	(63,558)
Forfeited, Options	(17,038)
Outstanding Options, ending	802,454	657,114
Options fully vested and exercisable at end of period, Options	447,461
Options expected to vest, Options	764,282
Outstanding, Weighted average exercise price, beginning	$ 26.69
Granted, Weighted average exercise price	23.13
Exercised, Weighted average exercise price	19.77
Forfeited, Weighted average exercise price	29
Outstanding, Weighted average exercised price, ending	26.18	$ 26.69
Options fully vested and exercisable at end of period, Weighted average exercise price	25.35
Options expected to vest, Weighted average exercise price	$ 26.17
Outstanding, Weighted average remaining contractual term in years	7 years 3 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 5 months 4 days
Options expected to vest, Weighted average remaining contractual term in years	6 years 10 months 24 days
Outstanding, Aggregate intrinsic value, beginning	$ 5,626
Outstanding, Outstanding, Aggregate intrinsic value, beginning	2,474	$ 5,626
Aggregate intrinsic Value of Options fully vested and exercisable at end of period	1,791
Options expected to vest, Aggregate Intrinsic Value	$ 2,390

Stock-based Compensation and _5

Stock-based Compensation and Benefits - Summary of Restricted Stock Activity (Details)	9 Months Ended
	Sep. 30, 2020USD ($)$ / sharesshares
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) | shares	122,198
Unvested Restricted shares, Granted (in shares) | shares	120,132
Unvested Restricted shares, Vested (in shares) | shares	(53,995)
Unvested Restricted shares, Forfeited (in shares) | shares	(9,502)
Unvested Restricted shares, Ending (in shares) | shares	178,833
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
Weighted average grant-date fair value, Granted (in dollars per share)	23.58
Weighted average grant-date fair value, Vested (in dollars per share)	34.40
Weighted average grant-date fair value, Forfeited (in dollars per share)	29.94
Weighted average grant-date fair value, Ending (in dollars per share)	$ 27.22
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) | shares	158,874
Unvested Restricted shares, Granted (in shares) | shares	68,498
Unvested Restricted shares, Net adjustment due to performance (in shares) | shares	17,852
Unvested Restricted shares, Vested (in shares) | shares	(53,540)
Unvested Restricted shares, Forfeited (in shares) | shares	(6,032)
Unvested Restricted shares, Ending (in shares) | shares	185,652
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
Weighted average grant-date fair value, Granted (in dollars per share)	26.74
Weighted average grant-date fair value, Net adjustment due to performance (in dollars per share)	33.22
Weighted average grant-date fair value, Vested (in dollars per share)	33.22
Weighted average grant-date fair value, Forfeited (in dollars per share)	29.37
Weighted average grant-date fair value, Ending (in dollars per share)	29.22
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
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

Common Stock - Narrative (Detai

Common Stock - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Feb. 26, 2020
Schedule Of Common Stock [Line Items]
Shares outstanding		30,594,412	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		30,594,412	31,176,627
Restricted issued but not yet vested, shares		178,833	122,198
New 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

Earnings Per Share - Narrative

Earnings Per Share - Narrative (Details) - $ / shares	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Earnings Per Share
Shares outstanding	30,594,412	31,169,086
Outstanding stock options to purchase common stock	802,454	661,467	657,114
Outstanding stock options to purchase common stock, per share	$ 26.18	$ 26.73	$ 26.69
Restricted shares outstanding	364,485	295,619

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		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share
Net income	$ 27,893	$ 21,642	$ 61,422	$ 60,846
Less: income allocated to participating securities	(36)	(25)	(96)	(69)
Income allocated to common shareholders	$ 27,857	$ 21,617	$ 61,326	$ 60,777
Weighted average shares outstanding for basic earnings per common share	30,756,116	31,281,970	30,881,325	31,133,982
Dilutive effect of equity awards	168,107	227,029	189,672	403,352
Weighted average shares outstanding for diluted earnings per common share	30,924,223	31,508,999	31,070,997	31,537,334
Basic earnings per share (in dollars per share)	$ 0.91	$ 0.69	$ 1.99	$ 1.95
Diluted earnings per share (in dollars per share)	$ 0.90	$ 0.69	$ 1.97	$ 1.93

Derivatives - FV of Derivatives

Derivatives - FV of Derivatives on the Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset derivatives fair value		$ 1,171
Liability derivatives fair value	$ 45,279	13,537
Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Asset derivatives fair value	33,247	10,519
Liability derivatives fair value	22,817	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	21,287	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	11,769	1,499
Other assets [Member] | Forward Contracts [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Asset derivatives fair value	191	16
Other liabilities [Member] | Interest rate products [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Liability derivatives fair value	45,279	13,537
Other liabilities [Member] | Interest rate products [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Liability derivatives fair value	21,371	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	440	141
Other liabilities [Member] | Forward Contracts [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Liability derivatives fair value	$ 1,006	$ 299

Derivatives - Narrative (Detail

Derivatives - Narrative (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Hedged Loans	$ 398.4	$ 405.9
Cumulative fair value hedge adjustment	46.9	13.9
Termination value of derivatives in net liability position	69.3
Eligible collateral posted	76.3
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Notional amount		99.8
Interest Rate Lock Commitments Notional Amount Member
Derivative [Line Items]
Notional amount	457.9
Forward Loan Sales Commitments Notional Amount Member
Derivative [Line Items]
Notional amount	516.4
Forward Contract Notional [Member]
Derivative [Line Items]
Notional amount		181.5
Designated as Hedging Instrument [Member] | Interest rate swap derivatives [Member]
Derivative [Line Items]
Notional amount	395.3	403.7
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swap derivatives [Member]
Derivative [Line Items]
Notional amount	$ 492.3	$ 478.9

Derivatives - Derivatives on th

Derivatives - Derivatives on the Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Not Designated as Hedging Instrument, Economic Hedge [Member]
Derivative [Line Items]
Amount of (loss) gain recognized in income on derivatives	$ 4,809	$ 672	$ 13,577	$ 1,578
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Amount of (loss) gain recognized in income on derivatives	5,043	5,809	1,310	(11,791)
Amount of gain (loss) recognized in income on hedged items	(4,993)	(3,313)	(2,869)	11,604
Interest rate products [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member] | Other Non-Interest income [Member]
Derivative [Line Items]
Amount of (loss) gain recognized in income on derivatives	8	(198)	(65)	(761)
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	5,043	5,809	1,310	(11,791)
Amount of gain (loss) recognized in income on hedged items	(4,993)	(3,313)	(2,869)	11,604
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	1,558	348	(532)	49
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	$ 3,243	$ 522	$ 14,174	$ 2,290

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Total Unfunded Commitments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Commitment And Contingencies [Line Items]
Total unfunded commitments	$ 846,822	$ 862,250
Commitments to fund loans [Member]
Commitment And Contingencies [Line Items]
Total unfunded commitments	280,496	249,914
Unfunded Commitment Line Of Credit [Member]
Commitment And Contingencies [Line Items]
Total unfunded commitments	557,464	600,407
Commercial And Standby Letters Of Credit [Member]
Commitment And Contingencies [Line Items]
Total unfunded commitments	$ 8,862	$ 11,929

Commitments and Contingencies_2

Commitments and Contingencies - Repurchaase Reserve (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Commitment And Contingencies [Line Items]
Beginning balance	$ 60,465			$ 40,082	$ 39,064	$ 35,692	$ 35,692
Recoveries	(133)		$ (39)		(515)	(217)
Ending balance	60,979	$ 60,465	38,710		60,979	38,710	39,064	$ 35,692
Allowance For Loan Repurchases Or Indemnification Beginning Balance		$ 2,725		$ 2,633
Allowance For Loan Repurchases Or Indemnification Provision or Release	285		(111)
Allowance For Loan Repurchases Or Indemnification Charge Offs	214		24
Allowance For Loan Repurchases Or Indemnification Ending Balance	2,796		$ 2,498
Loans Sold Subject to Repurchase [Member]
Commitment And Contingencies [Line Items]
Beginning balance					2,600
Ending balance	2,800				2,800		2,600
Allowance For Loan Repurchases Or Indemnification Beginning Balance							$ 2,589	$ 3,286
Allowance For Loan Repurchases Or Indemnification Provision or Release					604	(639)
Allowance For Loan Repurchases Or Indemnification Charge Offs	$ 214				397	149
Allowance For Loan Repurchases Or Indemnification Ending Balance					$ 2,796	$ 2,498

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Additional Information (Details)	9 Months Ended
	Sep. 30, 2020
Fair Value Of Financial Instruments [Abstract]
Residential mortgage loans held for sale period	45 days
Interest Rate Lock Commitments, Average Percentage Of Estimated Pull Through Rate To Calculate Fair Value	87

Fair Value Measurements - Table

Fair Value Measurements - Tables of Financial Instruments Measured At Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	$ 878,189	$ 766,799
Total liabilities at fair value	68,096	22,998
Loans held for sale member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	273,003	117,444
Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	394	372
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	2,003
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	92,892	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	476,650	542,037
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	866,229	765,284
Total liabilities at fair value	66,650	22,558
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	273,003	117,444
Level 2 [Member] | Municipal [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	394	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	2,003
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	92,892	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	476,650	542,037
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	11,960	1,515
Total liabilities at fair value	1,446	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	21,287	10,175
Total liabilities at fair value	66,650	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	21,287	10,175
Total liabilities at fair value	66,650	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	11,960	1,515
Total liabilities at fair value	1,446	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	11,960	1,515
Total liabilities at fair value	$ 1,446	$ 440

Fair Value Measurements - Tab_2

Fair Value Measurements - Table of Changes in Level 3 Financial Instruments (Details) - Derivative Financial Instruments Assets and Liabilities [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 1,075
Gain included in earnings, net	13,642
Fees and costs included in earnings, net	(4,203)
Ending Balance	$ 10,514

Fair Value Measurements - Tab_3

Fair Value Measurements - Table of Valuation Techniques and Unobservable Inputs Used in Valuation of Financial Instruments Falling Within Level 3 of Fair Value Hierarchy (Details)	Sep. 30, 2020
Minimum | Mortgage servicing rights member
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Servicing assets measurement input (as a percent)	18
Maximum | Mortgage servicing rights member
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Servicing assets measurement input (as a percent)	21.8
Weighted Average | Impaired Loans [Member] | Measurement Input, Discount Rate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair value of loans measurement input (as a percent)	0.145
Weighted Average | Mortgage servicing rights member | Measurement Input, Constant Prepayment Rate [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Servicing assets measurement input (as a percent)	18.1

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details)	9 Months Ended
	Sep. 30, 2020USD ($)loan	Sep. 30, 2019USD ($)loan	Dec. 31, 2019USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 4,556,121,000		$ 4,415,406,000
Impairment on other real estate owned	423,000	$ 872,000
Impairment on fixed assets related to banking center consolidations	1,600,000
Net Book Balance Of Fixed Assets Sold	8,000,000
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)	9.60%
Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Nonrecurring Loans Reserves	$ 1,100,000	$ 1,800,000
Number of Loans measured | loan	6	8
Loans	$ 4,600,000	$ 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%
Mortgage servicing rights member | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	9.50%
Mortgage servicing rights member | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	10.50%
Mortgage servicing rights member | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	9.50%

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	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	$ 878,189		$ 766,799
Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	53,390	$ 51,170
Losses From Fair Value Changes	4,870	9,794
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	33,603	37,002
Losses From Fair Value Changes	1,969	7,571
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	4,590	7,904
Losses From Fair Value Changes	423	872
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	7,173	2,879
Losses From Fair Value Changes	847	453
Premise 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 Measurements - Trans

Fair Value Measurements - Transfer Between Hierarchy Levels (Details) $ in Thousands	Sep. 30, 2020USD ($)
Fair Value Disclosures [Abstract]
Level 1 to Level 2 Transfer, Asset	$ 0

Fair Value of Financial Instr_4

Fair Value of Financial Instruments - Schedule of Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
ASSETS:
Cash and cash equivalents	$ 445,103	$ 110,190
Investment securities available-for-sale (at fair value)	572,523	638,249
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	320,001	182,884
Non-marketable securities	29,598	29,751
Loans receivable	4,495,142	4,376,342
Total Loans	4,556,121	4,415,406
Loans held-for-sale	273,003	117,444
Accrued interest receivable	20,600	17,200
LIABILITIES:
Time deposits	1,027,066	1,058,153
Securities sold under agreements to repurchase	23,904	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)	92,892	95,256
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	250,790	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)	476,650	542,037
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	69,211	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)	509	487
Corporate Debt Securities [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	2,003
Carrying Amount [Member] | Level 1 [Member]
ASSETS:
Cash and cash equivalents	445,103	110,190
Carrying Amount [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	92,892	95,256
Non-marketable securities	29,598	29,751
Loans held-for-sale	273,003	117,444
Accrued interest receivable	22,852	19,157
LIABILITIES:
Deposit transaction accounts	4,589,394	3,678,979
Time deposits	1,027,066	1,058,153
Securities sold under agreements to repurchase	23,904	56,935
Federal Home Loan Bank advances		207,675
Accrued interest payable	8,219	9,328
Derivative liability	66,650	22,558
Carrying Amount [Member] | Level 3 [Member]
ASSETS:
Loans receivable	4,556,121	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:
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	250,790	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)	476,650	542,037
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	69,211	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	394	372
Carrying Amount [Member] | Municipal [Member] | Level 3 [Member]
ASSETS:
Municipal obligations	115	115
Carrying Amount [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	2,003
Estimated Fair Value [Member] | Level 1 [Member]
ASSETS:
Cash and cash equivalents	445,103	110,190
Estimated Fair Value [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	92,892	95,256
Non-marketable securities	29,598	29,751
Loans held-for-sale	273,003	117,444
Accrued interest receivable	22,852	19,157
LIABILITIES:
Deposit transaction accounts	4,589,394	3,678,979
Time deposits	1,036,192	1,058,354
Securities sold under agreements to repurchase	23,904	56,935
Federal Home Loan Bank advances		207,890
Accrued interest payable	8,219	9,328
Derivative liability	66,650	22,558
Estimated Fair Value [Member] | Level 3 [Member]
ASSETS:
Loans receivable	4,723,757	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:
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	255,032	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)	476,650	542,037
Mortgage-backed securities-residential mortgage pass-through securities issued or guaranteed by U.S. Government agencies or sponsored enterprises held-to-maturity	69,688	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	394	372
Estimated Fair Value [Member] | Municipal [Member] | Level 3 [Member]
ASSETS:
Municipal obligations	115	115
Estimated Fair Value [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
ASSETS:
Investment securities available-for-sale (at fair value)	2,003
Interest rate swap derivatives [Member] | Carrying Amount [Member] | Level 2 [Member]
ASSETS:
Derivative asset	21,287	10,175
Interest rate swap derivatives [Member] | Estimated Fair Value [Member] | Level 2 [Member]
ASSETS:
Derivative asset	21,287	10,175
Mortgage banking derivatives | Carrying Amount [Member] | Level 3 [Member]
ASSETS:
Derivative asset	11,960	1,515
LIABILITIES:
Derivative liability	1,446	440
Mortgage banking derivatives | Estimated Fair Value [Member] | Level 3 [Member]
ASSETS:
Derivative asset	11,960	1,515
LIABILITIES:
Derivative liability	$ 1,446	$ 440