Old Second Bancorp (OSBC) 10-K 10 Mar 22 2021 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Mar. 07, 2022	Jun. 30, 2021
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2021
Entity File Number	000-10537
Entity Registrant Name	OLD SECOND BANCORP INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-3143493
Entity Address, Address Line One	37 South River Street
Entity Address, City or Town	Aurora
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60507
City Area Code	(630)
Local Phone Number	892-0202
Title of 12(b) Security	Common Stock
Trading Symbol	OSBC
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 341.6
Entity Common Stock, Shares Outstanding		44,461,045
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Central Index Key	0000357173
Amendment Flag	false
Auditor Name	Plante & Moran PLLC
Auditor Firm ID	166
Auditor Location	Chicago, Illinois

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 38,565	$ 24,306
Interest earning deposits with financial institutions	713,542	305,597
Cash and cash equivalents	752,107	329,903
Securities available-for-sale, at fair value	1,692,488	496,178
Federal Home Loan Bank Chicago ("FHLBC") and Federal Reserve Bank Chicago ("FRBC") stock	13,257	9,917
Loans held-for-sale	4,737	12,611
Loans	3,421,948	2,034,851
Less: allowance for credit losses on loans	44,281	33,855
Net loans	3,377,667	2,000,996
Premises and equipment, net	88,005	45,477
Other real estate owned	2,356	2,474
Mortgage servicing rights, at fair value	7,097	4,224
Goodwill	86,332	18,604
Core deposit intangible	16,304	2,177
Bank-owned life insurance ("BOLI")	105,300	63,102
Deferred tax assets, net	6,100	8,121
Other assets	60,439	47,053
Total assets	6,212,189	3,040,837
Deposits:
Noninterest bearing demand	1,428,055	909,505
Interest bearing:
Savings, NOW, and money market	3,534,367	1,202,134
Time	503,810	425,434
Total deposits	5,466,232	2,537,073
Securities sold under repurchase agreements	50,337	66,980
Junior subordinated debentures	25,773	25,773
Subordinated debentures	59,212
Senior notes	44,480	44,375
Notes payable and other borrowings	19,074	23,393
Other liabilities	45,054	36,156
Total liabilities	5,710,162	2,733,750
Stockholders' Equity
Common stock	44,705	34,957
Additional paid-in capital	202,443	122,212
Retained earnings	252,011	236,579
Accumulated other comprehensive income	8,768	14,762
Treasury stock	(5,900)	(101,423)
Total stockholders' equity	502,027	307,087
Total liabilities and stockholders' equity	$ 6,212,189	$ 3,040,837

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2021	Dec. 31, 2020
Consolidated Balance Sheets
Common stock, Par value (in dollars per share)	$ 1	$ 1
Common Stock, Shares authorized	60,000,000	60,000,000
Common stock, Shares issued	44,705,150	34,957,384
Common stock, Shares outstanding	44,461,045	29,328,723
Treasury stock, Shares	244,105	5,628,661

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest and dividend income
Loans, including fees	$ 90,665	$ 90,923	$ 97,719
Loans held-for-sale	165	306	133
Securities:
Taxable	8,099	6,773	9,256
Tax exempt	5,174	5,471	7,425
Dividends from FHLBC and FRBC stock	456	484	602
Interest bearing deposits with financial institutions	656	258	459
Total interest and dividend income	105,215	104,215	115,594
Interest expense
Savings, NOW, and money market deposits	961	1,569	2,960
Time deposits	1,510	5,033	6,736
Securities sold under repurchase agreements	82	202	577
Other short-term borrowings		179	1,755
Junior subordinated debentures	1,133	2,215	3,724
Subordinated debentures	1,610
Senior notes	2,692	2,692	2,699
Notes payable and other borrowings	463	574	384
Total interest expense	8,451	12,464	18,835
Net interest and dividend income	96,764	91,751	96,759
Provision for credit losses	4,326	10,413	1,600
Net interest and dividend income after provision for credit losses	92,438	81,338	95,159
Noninterest income
Mortgage servicing rights mark to market gain (loss)	1,261	(3,999)	(2,662)
Net gain on sales of mortgage loans	9,300	15,519	5,112
Securities (losses) gains, net	232	(25)	4,511
Change in cash surrender value of BOLI	1,390	1,233	1,415
Death benefit realized on BOLI		57	872
Card related income	6,704	5,532	5,861
Other income	2,377	2,149	2,278
Total noninterest income	39,230	37,487	35,800
Noninterest expense
Salaries and employee benefits	57,691	49,547	46,869
Occupancy, furniture and equipment	13,583	8,498	8,289
Computer and data processing	7,938	5,143	5,631
FDIC insurance	975	597	176
General bank insurance	1,214	1,030	1,002
Amortization of core deposit intangible	644	494	539
Advertising expense	343	298	1,225
Card related expense	2,538	2,195	1,956
Legal fees	1,105	761	675
Consulting and management fees	5,005	760	242
Other real estate expense, net	167	651	423
Other expense	12,598	11,443	12,075
Total noninterest expense	103,801	81,417	79,102
Income before income taxes	27,867	37,408	51,857
Provision for income taxes	7,823	9,583	12,402
Net income	$ 20,044	$ 27,825	$ 39,455
Basic earnings per share	$ 0.66	$ 0.94	$ 1.32
Diluted earnings per share	0.65	0.92	1.30
Dividends declared per share	$ 0.16	$ 0.04	$ 0.04
Trust Income
Noninterest income
Service charges on deposits	$ 9,334	$ 7,905	$ 8,045
Bank Servicing
Noninterest income
Service charges on deposits	5,408	5,512	7,715
Secondary mortgage fees
Noninterest income
Service charges on deposits	1,044	1,654	772
Mortgage Servicing
Noninterest income
Service charges on deposits	$ 2,180	$ 1,950	$ 1,881

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Consolidated Statements of Comprehensive Income
Net Income	$ 20,044	$ 27,825	$ 39,455
Unrealized holding (losses) gains on available-for-sale securities arising during the period	(8,513)	14,690	19,630
Related tax benefit (expense)	2,406	(4,122)	(5,521)
Holding (losses) gains, after tax, on available-for-sale securities	(6,107)	10,568	14,109
Less: Reclassification adjustment for the net gains (losses) realized during the period
Net realized gains (losses)	232	(25)	4,511
Related tax (expense) benefit	(65)	7	(1,267)
Net realized gains (losses) after tax	167	(18)	3,244
Other comprehensive (loss) income on available-for-sale securities	(6,274)	10,586	10,865
Changes in fair value of derivatives used for cash flow hedges	389	(533)	(3,092)
Related tax (expense) benefit	(109)	147	868
Other comprehensive income (loss) on cash flow hedges	280	(386)	(2,224)
Total other comprehensive (loss) income	(5,994)	10,200	8,641
Total comprehensive income	$ 14,050	$ 38,025	$ 48,096

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net income	$ 20,044,000	$ 27,825,000	$ 39,455,000
Adjustments to reconcile net income to net cash provided by operating activities:
Net premium / discount amortization on securities	2,932,000	2,329,000	2,726,000
Securities (gains) losses, net	(232,000)	25,000	(4,511,000)
Provision (release) for credit losses	4,326,000	10,413,000	1,600,000
Originations of loans held-for-sale	(239,175,000)	(384,379,000)	(164,696,000)
Proceeds from sales of loans held-for-sale	254,374,000	388,538,000	168,472,000
Net gains on sales of mortgage loans	(9,300,000)	(15,519,000)	(5,112,000)
Mortgage servicing rights mark to market loss	(1,261,000)	3,999,000	2,662,000
Net accretion of discount on loans	(1,177,000)	(911,000)	(1,025,000)
Net change in cash surrender value of BOLI	(1,390,000)	(1,233,000)	(1,415,000)
Net gains on sale of other real estate owned	(41,000)	(204,000)	(264,000)
Provision for other real estate owned valuation losses	79,000	357,000	519,000
Depreciation of fixed assets and amortization of leasehold improvements	3,152,000	2,798,000	2,462,000
Write-down of fixed assets	3,809,000
Amortization of core deposit intangibles	644,000	494,000	539,000
Change in current income taxes receivable	(9,286,000)	811,000	1,546,000
Deferred tax expense (benefit)	6,479,000	(646,000)	6,436,000
Change in accrued interest receivable and other assets	6,865,000	(17,692,000)	(6,350,000)
Accretion of purchase accounting adjustment on time deposits	(155,000)		(38,000)
Amortization of purchase accounting adjustment on notes payable and other borrowings	(4,000)	27,000	92,000
Amortization of junior subordinated debentures issuance costs		643,000	48,000
Amortization of subordinated debentures issuance costs	64,000
Amortization of senior notes issuance costs	105,000	105,000	112,000
Change in accrued interest payable and other liabilities	(11,240,000)	6,118,000	6,863,000
Stock based compensation	1,435,000	2,089,000	2,516,000
Net cash provided by operating activities	31,047,000	25,987,000	52,637,000
Cash flows from investing activities
Proceeds from maturities and calls, including pay down of securities available-for-sale	138,874,000	48,054,000	41,752,000
Proceeds from sales of securities available-for-sale	605,846,000	18,006,000	191,298,000
Purchases of securities available-for-sale	(886,103,000)	(65,229,000)	(159,544,000)
Proceeds from sales of FHLBC/FRBC stock			6,875,000
Purchases of FHLBC/FRBC stock			(3,359,000)
Net change in loans	122,102,000	(103,887,000)	(34,440,000)
Purchases of BOLI policies	(591,000)	(590,000)
Proceeds from claims on BOLI, net of claims receivable		484,000	1,196,000
Proceeds from sales of other real estate owned, net of participations and improvements	5,828,000	3,275,000	2,779,000
Proceeds from disposition of fixed assets			32,000
Net purchases of premises and equipment	(2,033,000)	(3,921,000)	(4,377,000)
Cash and cash equivalents acquired, net of cash paid for acquisition	148,995,000
Net cash provided by (used in) investing activities	132,918,000	(103,808,000)	42,212,000
Cash flows from financing activities
Net change in deposits	235,078,000	410,324,000	10,114,000
Net change in securities sold under repurchase agreements	(16,643,000)	18,287,000	2,061,000
Net change in other short-term borrowings		(48,500,000)	(101,000,000)
Redemption of junior subordinated debentures		(32,604,000)
Issuance of subordinated debentures, net of issuance costs	59,148,000
Issuance of term note		20,000,000
Repayment of term note	(4,000,000)	(3,000,000)
Net change in notes payable and other borrowings, excluding term note	(315,000)	(307,000)	(8,798,000)
Proceeds from exercise of stock options			32,000
Dividends paid on common stock	(4,612,000)	(1,186,000)	(1,195,000)
Purchase of treasury stock	(10,417,000)	(5,922,000)	(666,000)
Net cash provided by (used in) financing activities	258,239,000	357,092,000	(99,452,000)
Net change in cash and cash equivalents	422,204,000	279,271,000	(4,603,000)
Cash and cash equivalents at beginning of period	329,903,000	50,632,000	55,235,000
Cash and cash equivalents at end of period	752,107,000	329,903,000	50,632,000
Supplemental cash flow information
Income taxes paid, net	10,612,000	7,922,000	4,425,000
Interest paid for deposits	2,752,000	7,255,000	9,686,000
Interest paid for borrowings	5,366,000	5,093,000	9,073,000
Non-cash transfer of loans to other real estate owned	$ 196,000	$ 898,000	$ 863,000

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Cumulative Effect, Period of Adoption, Adjustment	Total
Balance at Dec. 31, 2018	$ 34,720	$ 119,081		$ 175,463	$ (4,079)	$ (96,104)		$ 229,081
Increase (Decrease) in Stockholders' Equity
Net Income				39,455				39,455
Other comprehensive income (loss), net of tax					8,641			8,641
Dividends declared and paid				(1,195)				(1,195)
Vesting of restricted stock	132	(634)				502
Stock options exercised	2	7				23		32
Stock warrants exercised		(313)				313
Stock based compensation		2,516						2,516
Purchase of treasury stock from taxes withheld on stock awards						(666)		(666)
Balance at Dec. 31, 2019	34,854	120,657		213,723	4,562	(95,932)		277,864
Increase (Decrease) in Stockholders' Equity
Net Income				27,825				27,825
Other comprehensive income (loss), net of tax					10,200			10,200
Dividends declared and paid				(1,186)				(1,186)
Vesting of restricted stock	103	(534)				431
Stock based compensation		2,089						2,089
Purchase of treasury stock from taxes withheld on stock awards						(423)		(423)
Purchase of treasury stock from stock repurchase program						(5,499)		(5,499)
Balance at Dec. 31, 2020	34,957	122,212	$ (3,783)	236,579	14,762	(101,423)	$ (3,783)	307,087
Increase (Decrease) in Stockholders' Equity
Net Income				20,044				20,044
Other comprehensive income (loss), net of tax					(5,994)			(5,994)
Dividends declared and paid				(4,612)				(4,612)
Acquisitions, WSB	9,748	81,154				103,582		194,484
Vesting of restricted stock		(2,358)				2,358
Stock based compensation		1,435						1,435
Purchase of treasury stock from taxes withheld on stock awards						(605)		(605)
Purchase of treasury stock from stock repurchase program						(9,812)		(9,812)
Balance at Dec. 31, 2021	$ 44,705	$ 202,443		$ 252,011	$ 8,768	$ (5,900)		$ 502,027

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	$ 307,087	$ 277,864	$ 229,081
Other comprehensive (loss) income, net of tax	(5,994)	10,200	8,641
Balance	$ 502,027	$ 307,087	$ 277,864
Dividend declared and paid (per share)	$ 0.16	$ 0.04	$ 0.04
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	$ 14,762	$ 4,562	$ (4,079)
Other comprehensive (loss) income, net of tax	(5,994)	10,200	8,641
Balance	8,768	14,762	4,562
Accumulated Unrealized Gain (Loss) on Securities Available-for-Sale
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	17,413	6,827	(4,038)
Other comprehensive (loss) income, net of tax	(6,274)	10,586	10,865
Balance	11,139	17,413	6,827
Accumulated Unrealized Gain (Loss) on Derivative Instruments
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	(2,651)	(2,265)	(41)
Other comprehensive (loss) income, net of tax	280	(386)	(2,224)
Balance	$ (2,371)	$ (2,651)	$ (2,265)

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
Summary of Significant Accounting Policies
Summary of Significant Accounting Policies	Note 1: Summary of Significant Accounting Policies ​ Nature of Operations ​ The consolidated financial statements of the Company include the financial statements of the Bank and its wholly-owned subsidiaries, River Street Advisors, LLC, an investment advisory/management service company, Old Second Affordable Housing Fund, L.L.C., which provides down payment assistance for home ownership to qualified individuals, and Melrose Holdings LLC and Station I, LLC, both of which hold property acquired by the Bank through foreclosure or in the ordinary course of collecting a debt previously contracted with borrowers. The Company uses the accrual basis of accounting for financial reporting purposes. Certain amounts in prior year financial statements have been reclassified to conform to the 2021 presentation. ​ Use of Estimates ​ Principles of Consolidation – ​ Segment Reporting ​ Concentration of Credit Risk ​ Cash and Cash Equivalents – For purposes of the Consolidated Statements of Cash Flows, management has defined cash and cash equivalents to include cash and due from banks, interest-earning deposits in other financial institutions, and other short-term investments, such as federal funds sold and securities purchased under agreements to resell. The classification of cash and cash equivalents includes those assets held in the form of cash or liquid instruments with an original maturity of 90 days or less. ​ Securities ​ Realized securities gains or losses, which are reported in securities gains (losses), net, in the Consolidated Statements of Income, are recognized on a trade date basis and are determined using the specific identification method. Discounts are accreted into interest income over the estimated life of the related security and premiums are amortized into income to the earlier of the call date or estimated life of the related security using the level yield method. ​ The Company has made a policy election to exclude accrued interest income from the amortized cost basis of available-for-sale debt securities and report accrued interest separately in other assets in the Consolidated Balance Sheets. A debt security is placed on nonaccrual status at the time we no longer expect to receive all contractual amounts due, which is generally at 90 days past due. Accrued interest for a security placed on nonaccrual is reversed against interest income. Accordingly, we do not recognize an allowance for credit loss against accrued interest receivable. ​ For available-for-sale debt securities in an unrealized loss position, we first assess whether we intend to sell, or it is more likely than not that we will be required to sell the security, prior to the recovery of its amortized cost basis. If either of the above criteria is met, the security’s amortized cost basis is written down to fair value through earnings. When the criteria above is not met, we evaluate whether the decline in fair value is the result of credit losses or other factors. In making this assessment, we review changes to the rating of the security by a rating agency, an increase in defaults on the underlying collateral, and the extent to which the securities are issued by the federal government or its agencies, including the amount of the guarantee issued by those agencies, among other factors. If this assessment indicates that a credit loss exists, we compare the present value of cash flows expected to be collected from the security with the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis for the security, a credit loss exists and an allowance for credit losses is recorded through earnings, limited to the amount that the fair value of the security is less than its amortized cost basis. Any impairment that has not been recorded through an allowance for credit losses is recognized in other comprehensive income (loss), net of taxes. ​ Changes in the allowance for credit losses are recorded as a provision for (or reversal of) credit loss expense. Losses are charged against the allowance when management believes the uncollectibility of an available for sale debt security is confirmed or when either of the criteria regarding intent or requirement to sell is met. ​ Federal Home Loan Bank and Federal Reserve Bank Stock ​ Loans Held-for-Sale ​ Loans ​ Interest income on loans is accrued based on principal amounts outstanding. Loan and lease origination fees, commitment fees, and certain direct loan origination costs are deferred and amortized over the life of the related loans or commitments as a yield adjustment. Fees related to standby letters of credit, whose ultimate exercise is remote, are amortized into fee income over the estimated life of the commitment. Other related fees are recognized as fee income when earned. ​ Past Due and Nonaccrual Loans ​ Loans are considered past due or delinquent when the contractual principal or interest due in accordance with the terms of the loan agreement or any portion thereof remains unpaid after the due date of the scheduled payment. Generally, loans are placed on nonaccrual status (i) when either principal or interest payments become 90 days or more past due based on contractual terms unless the loan is sufficiently collateralized such that full repayment of both principal and interest is expected and is in the process of collection within a reasonable period or (ii) when an individual analysis of a borrower’s creditworthiness indicates a credit should be placed on nonaccrual status whether or not the loan is 90 days or more past due. When a loan is placed on nonaccrual status, unpaid interest credited to income is reversed. Interest received on such loans is accounted for on the cash-basis or cost recovery method, until qualifying for return to accrual. Under the cost-recovery method, interest income is not recognized until the loan balance is reduced to zero. Under the cash basis method, interest income is recorded when the payment is received in cash. Nonaccrual loans are returned to accrual status when the financial position of the borrower and other relevant factors indicate there is no longer doubt that the Company will collect all principal and interest due. ​ Troubled Debt Restructurings (“TDRs”) ​ A restructuring of debt is considered a TDR when (i) the borrower is experiencing financial difficulties and (ii) the creditor grants a concession, such as forgiveness of principal, reduction of the interest rate, changes in payments, or extension of the maturity, that it would not otherwise consider. Loans are not classified as TDRs when the modification is short-term or results in only an insignificant delay or shortfall in the payments to be received. The Company’s TDRs are determined on a case-by-case basis in connection with ongoing loan collection processes. ​ The Company does not accrue interest on any TDRs unless it believes collection of all principal and interest under the modified terms is reasonably assured. For TDRs to accrue interest, the borrower must demonstrate both some level of past performance and the capacity to perform under the modified terms. Generally, six months of consecutive payment performance by the borrower under the restructured terms is required before TDRs are returned to accrual status. However, the period could vary depending on the individual facts and circumstances of the loan. An evaluation of the borrower’s current creditworthiness is used to assess whether the borrower has the capacity to repay the loan under the modified terms. This evaluation includes an estimate of expected cash flows, evidence of strong financial position, and estimates of the value of collateral, if applicable. ​ Purchase Credit Deteriorated (PCD) Loans ​ Purchased credit deteriorated loans (“PCD loans”) are purchased loans, that, as of the date of acquisition, have experienced a more-than-insignificant deterioration in credit quality since origination, as determined by the Company’s assessment. An allowance for credit losses is determined using the same methodology as other loans held for investment. The initial allowance for credit losses determined on an individual loan basis from an evaluation of each specific loan and its related credit metrics. The sum of the loan’s purchase price and initial allowance for credit losses becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is accreted or amortized into interest income over the life of the loan. Expected cash flows in excess of the amount paid are recorded as interest income over the remaining life of the loans (accretable yield). The excess of the loan’s contractual principal and interest over expected cash flows is not recorded (nonaccretable difference). ​ Subsequent changes to the allowance for credit losses are recorded through provision for credit losses. Over the life of the loan, expected cash flows continue to be estimated. If the present value of expected cash flows is less than the carrying amount, a loss is recorded as a provision for credit losses. If the present value of expected cash flows is greater than the carrying value, it is recognized as part of future interest income. ​ Non-Purchase Credit Deteriorated (Non-PCD) Loans ​ Non-purchased credit deteriorated loans (“non-PCD loans”) are purchased loans, that, as of the date of acquisition, have not experienced a significant deterioration in credit quality since origination, as determined by the Company’s assessment. An allowance for credit losses is determined using the same methodology as other loans held for investment, and no allowance is established as a Day One fair valuation allowance. The sum of the loan’s purchase price becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a discount or premium, which is comprised of an interest component and a credit component, and is accreted or amortized into interest income over the life of the loan. Expected cash flows in excess of the amount paid are recorded as interest income over the remaining life of the loans (accretable yield). The excess of the loan’s contractual principal and interest over expected cash flows is not recorded (nonaccretable difference). ​ A subsequent Day Two adjustment on non-PCD loans is recorded to the allowance for credit losses immediately after acquisition, which reflects the future estimated lifetime credit losses on the non-PCD loans, recorded through the provision for credit losses. Over the life of the loan, expected cash flows continue to be estimated. If the present value of expected cash flows is less than the carrying amount, a loss is recorded as a provision for credit losses. If the present value of expected cash flows is greater than the carrying value, it is recognized as part of future interest income. ​ On January 1, 2020, the Company implemented ASU No. 2016-13, “Financial Instruments – Credit Measurement of Credit Losses on Financial Instruments (Topic 326),” also known as Current Expected Credit Losses, or CECL. As a result of CECL implementation, the Company’s purchase credit impaired loans (“PCI loans”) became PCD loans. ​ Allowance for Credit Losses ​ ACL on Loans ​ The ACL on loans is a valuation account that is deducted from the amortized cost basis of loans to present the net amount expected to be collected on loans. The Company’s estimate of the ACL for loans reflects losses expected over the remaining contractual life of the loans. The contractual term does not consider extensions, renewals or modifications unless the Company has identified an expected troubled debt restructuring. ​ Determination of the ACL on loans is inherently subjective in nature since it requires significant estimates and management judgment, and includes a level of imprecision given the difficulty of identifying and assessing the factors impacting loan repayment and estimating the timing and amount of losses. While management utilizes its best judgment and information available, the ultimate adequacy of the ACL is dependent upon a variety of factors beyond the Company’s direct control, including, but not limited to, the performance of the loan portfolio, consideration of current economic trends, changes in interest rates and property values, estimated losses on pools of homogeneous loans based on an analysis that uses historical loss experience for prior periods that are determined to have like characteristics with the current period such as pre-recessionary, recessionary, or recovery periods, portfolio growth and concentration risk, management and staffing changes, the interpretation of loan risk classifications by regulatory authorities and other credit market factors. While each component of the ACL on loans is determined separately, the entire balance is available for the entire loan portfolio. ​ The ACL methodology consists of measuring loans on a collective (pool) basis when similar risk characteristics exist. The type of credit composition and risk characteristics of each portfolio segment are as follows: ​ Commercial loans – Such credits typically comprise working capital loans, loans for physical asset expansion, asset acquisition loans and other commercial and industrial business loans. Loans to closely held businesses will generally be guaranteed in full or for a meaningful amount by the businesses’ major owners. Commercial loans are made based primarily on the historical and projected cash flow of the borrower and secondarily on the underlying collateral provided by the borrower. The cash flows of borrowers, however, may not behave as forecasted and collateral securing loans may fluctuate in value due to economic or individual performance factors. Minimum standards and underwriting guidelines have been established for all commercial loan types. The Company classifies five different risk levels for this segment to assign a loss rate based on historical losses, and also performs an analysis using expectations for the weighted risk rating trends to run a regression analysis to a severe loss scenario to determine adjustments needed within the special mention and substandard sub-segments . ​ Lease financing receivables – ​ Real estate - commercial loans - ● CRE owner occupied – the Company classifies five different risk levels within this segment to assign a loss rate based on historical losses, as well as utilizing a forecasted average unemployment rate for the next twelve months as a loss driver. ● CRE investor – the Company classifies five different risk levels within this segment to assign a loss rate based on historical losses, as well as utilizing a forecasted average unemployment rate for the next twelve months as a loss driver. The primary difference between this segment and CRE owner occupied is within the slightly elevated historical loss rates and qualitative factors used, as the CRE investor properties are sponsored compared to owner occupied. ​ Real estate – construction loans – The Company defines real estate - construction loans as loans where the loan proceeds are controlled by the Company and used exclusively for the improvement or development of real estate in which the Company holds a mortgage. Due to the inherent risk in this type of loan, they are subject to other industry specific policy guidelines outlined in the Company’s Credit Risk Policy and are monitored closely. The Company’s historical loss rates are utilized from the prior periods which align to the current unemployment projections. ​ Real estate - residential loans ● Residential owner-occupied – the Company applies historical loss rates from periods with like characteristics as the current period, with a longer remaining life than other segments, due to the usually longer-term nature of these loans. ● Residential investor – the Company applies historical loss rates from periods with like characteristics as the current period, with a slightly longer remaining life than other segments, but shorter duration than residential owner-occupied. ● Multifamily – the Company classifies five different risk levels within this segment to assign a loss rate based on historical losses, as well as utilizing a forecasted average unemployment rate for the next twelve months as a loss driver. ​ Home equity lines of credit (“HELOCs”) ● HELOC legacy - The Company’s historical loss rates are utilized from the prior periods which align to the current unemployment projections. ● HELOC purchased - The Company’s historical loss rates are utilized from the prior periods which align to the current unemployment projections; in addition, the peer data source used for loss rate analysis is the correspondent bank from which we purchased the HELOCs. ​ Consumer loans ​ The methodologies used for calculating the ACL on each loan segment include (i) a migration analysis for commercial, CRE owner occupied, CRE investor, and multifamily segments; (ii) a static analysis for construction, residential investor, residential owner occupied and the legacy HELOC segments; and (iii) a WARM (weighted average remaining life) methodology is used for lease financing receivables, HELOCs purchased, and consumer segments. For loan pools sub-segmented by risk level, which include commercial, real estate-commercial and multifamily segments, linear regression methods were utilized along with expected industry performance over the next twelve months to determine what level of qualitative adjustment would be necessary to account for expected risk rating migration. This methodology relied heavily on existing and anticipated weighted risk ratings by industry or property type. The forecast period used for each segment calculation was one year, with an immediate reversion to historical loss rates following this one year period. In addition, the Company applies qualitative adjustments to each different loan or lease segment, as described below. ​ The qualitative factors applied to each ● changes in lending policies and procedures, including changes in underwriting standards and collections, charge-offs and recovery practices; ● changes in international, national, regionally and local conditions (specific factors which impact portfolios or discrepancies with national economic factors which are utilized within the economic forecast); ● changes in the experience, depth and ability of lending management; ● changes in the volume and severity of past due loans and other similar loan conditions; ● changes in the nature and volume of the loan portfolio and terms of loans; ● the existence and effect of any concentrations of credit and changes in the levels of such concentrations (this characteristic requires any portfolio exceeding 25% of capital to have a factor considered unless the pool is otherwise well diversified or holds a relatively low inherent risk); ● effects of other external factors, such as competition, legal or regulatory factors, on the level of estimated credit losses; ● changes in the quality of our loan review functions; and ● changes in the value of underlying collateral for collateral dependent loans. ​ The impact of the above listed internal and external qualitative and credit market risk factors is assessed within predetermined ranges to adjust the ACL totals calculated. Changes in the above factors are assessed no less than quarterly, and directly impact the total estimated credit losses recorded. Specific factor updates that drove the changes to the total ACL in 2021 included a reduction in the unemployment rate for the forecast period, a decrease in line utilization rates due to continuing borrower liquidity, and the acquisition of West Suburban, which increased loan volumes and total nonperforming loans year over year. The above methods are consistent with the methods utilized in the prior year, since the adoption of CECL as of January 1, 2020. ​ Loans that do not share risk characteristics are evaluated on an individual basis. Such loans evaluated individually are not also included in the collective evaluation. The amount of expected credit loss is measured based upon the present value of expected future cash flows discounted at the loan’s effective interest rate or the fair value of the underlying collateral less applicable selling costs. When management determines that foreclosure is probable, the amount of credit loss is determined using the fair value of collateral, less costs to sell. ​ Loans are charged off against the ACL when management believes the uncollectibility of a loan balance is confirmed, while recoveries of amounts previously charged-off are credited to the ACL. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged off. Approved releases from previously established ACL reserves authorized under our ACL methodology also reduce the ACL. Additions to the ACL are established through the provision for credit losses on loans, which is charged to expense. The Company’s ACL methodology is intended to reflect all loan portfolio risk, but management recognizes the inability to accurately depict all future credit losses in a current ACL estimate, as the impact of various factors cannot be fully known. Accrued interest receivable on loans is excluded from the amortized cost basis of financing receivables for the purpose of determining the allowance for credit losses. ​ ACL on Unfunded Loan Commitments ​ The Company estimates expected credit losses over the contractual period in which the Company is exposed to credit risk by a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Company. The ACL related to off-balance sheet credit exposures, which is within other liabilities on the Company’s Consolidated Balance Sheets, is estimated at each balance sheet date under the CECL model, and is adjusted as determined necessary through the provision for credit losses on the income statement. The estimate for ACL on unfunded loan commitments includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over its estimated life. ​ Premises and Equipment – Premises, furniture, equipment, and leasehold improvements are stated at cost less accumulated depreciation and amortization. Depreciation expense is determined by the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized on a straight-line basis over the shorter of the life of the asset or the lease term including anticipated renewals. Rates of depreciation are generally based on the following useful lives: buildings, 25 to 40 years ; building improvements, 3 to 15 years or longer under limited circumstances; and furniture and equipment, 3 to 10 years . Gains and losses on dispositions are included in other noninterest expense in the Consolidated Statements of Income. Maintenance and repairs are charged to operating expenses as incurred, while improvements that conform to definitions of tangible property improvements are capitalized and depreciated over the estimated remaining life. ​ Whenever events or changes in circumstances dictate, the Company tests its long-lived assets for impairment by determining whether the sum of the estimated undiscounted future cash flows attributable to a long-lived asset or asset group is less than the carrying value of the long-lived asset or asset group through a probability-weighted approach. In the event the carrying amount of the long-lived asset or asset group is not recoverable, an impairment loss is measured as the amount by which the carrying amount of the long-lived asset or asset group exceeds its fair value. ​ Other Real Estate Owned (“OREO”) ​ Mortgage Servicing Rights ​ Mortgage loans that the Company is servicing for others aggregated to $801.9 million and $793.5 million at December 31, 2021, and 2020, respectively. Mortgage loans that the Company is servicing for others are not included in the consolidated balance sheets. Fees received in connection with servicing loans for others are recognized as earned. Loan servicing costs are charged to expense as incurred. ​ Servicing rights are recognized separately as assets when they are acquired through sales of loans and servicing rights are retained. Servicing rights are initially recorded at fair value with the effect recorded in net gains on sales of mortgage loans in the Consolidated Statements of Income. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses. ​ Servicing fee income, which is included in the Consolidated Statements of Income as mortgage servicing income, is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan and are recorded as income when earned. ​ Under the fair value measurement method, the Company measures mortgage servicing rights at fair value at each reporting date, reports changes in fair value of servicing assets in earnings in the period in which the changes occur, and includes these changes in mortgage servicing rights mark to market in the Consolidated Statements of Income. The fair values of mortgage servicing rights are subject to significant fluctuations as a result of changes in estimated and actual prepayment speeds and default rates and losses. ​ Bank-Owned Life Insurance (“BOLI”) Balance Sheets at their cash surrender value (“CSV”) or the amount that could be realized. The change in CSV is recorded as an increase in cash surrender value of bank-owned life insurance in the Consolidated Statements of Income in noninterest income. In addition, insurance proceeds received, net of the original premium investment, are recorded as death benefit realized on bank-owned life insurance in the Consolidated Statements of Income in noninterest income. ​ Goodwill and Core Deposit Intangible ​ The Company’s November 30, 2021 and 2020 qualitative goodwill assessments resulted in the Company determining goodwill was not impaired, as it was more likely than not the Company’s fair value exceeded its carrying value. Due to the significant deterioration of economic conditions stemming from the COVID-19 pandemic during 2020, the Company performed interim impairment evaluations at March 31, June 30 and September 30, 2020, to assess impairment indicators, due to the decline in the trading price of our common stock, an elevated U.S. unemployment rate, and the expected impact of the pandemic on our business, operations, and financial condition. As the negative market indicators were not observed over a sustained period of time, we determined it was more likely than not the Company’s fair value exceeded its carrying value. Accordingly, a quantitative analysis was not performed. ​ The core deposit intangible (“CDI”) is being amortized on an accelerated method over a ten year estimated useful life. As of December 31, 2021, CDI totaled $16.3 million, which reflected growth of $14.8 million due to the addition of CDI stemming from the West Suburban acquisition. As of December 31, 2020, CDI totaled $2.2 million, stemming from the Company’s purchase of ABC Bank in 2018 and the Talmer branch purchase in 2016. Total CDI amortization expense of $644,000 , $494,000 , and $539,000 was recorded in 2021, 2020, and 2019, respectively. The expected future annual amortization expense for each of the next five years (2022-2026) is approximately $2.6 million, $2.5 million, $2.3 million, $2.1 million, and $1.8 million, respectively. ​ Debt Issuance Costs – Costs associated with the issuance of debt are presented in the Consolidated Balance Sheet as a direct reduction from the carrying value of that debt liability. The deferred issuance costs are amortized over the life the related debt instrument, and included within the debt’s interest expense. ​ Loss Contingencies – ​ Noninterest Income ​ Wealth management ​ Service charges on deposits ​ Card related income ​ Advertising Costs ​ Equity Incentive Plan data is used to estimate option exercise rates and post-vesting termination behavior, and the risk-free interest rate for the expected term of the option is based on the Treasury yield curve in effect at the time of grant. The market price of the Company’s common stock at the date of grant is used for restricted stock awards, which include restricted stock units. Compensation cost is recognized over the required service period, generally defined as the vesting period, and is net of a 5% forfeiture assumption for group grants. Upon vesting, compensation costs for the award expense is trued up based on actual forfeitures incurred. Once the award is settled, the Company would determine whether the cumulative tax deduction exceeded the cumulative compensation cost recognized in the Consolidated Statement of Income. The cumulative tax deduction would include both the deductions from the dividends and the deduction from the exercise or vesting of the award. If the tax benefit received from the cumulative deductions exceeds the tax effect of the recognized cumulative compensation cost, the excess would be recognized as a credit to income tax expense. ​ I ncome Taxes ​ Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using the enacted tax rates that are expected to apply to taxable income in years in which those temporary differences are expected to be recovered or settled. ​ As of December 31, 2021 and 2020 the Company evaluated tax positions taken for filings with the Internal Revenue Service and all state jurisdictions in which it operates. The Company believes that income tax filing positions will be sustained under examination and does not anticipate any adjustments that would result in a material adverse effect on the Company’s financial condition, results of operations, or cash flows. Accordingly, the Company has not recorded any reserves or related accruals for interest and penalties for uncertain tax positions at December 31, 2021 or 2020. The Company is currently open to audit under the statute of limitations for Federal taxes from 2018 to 2020 and various state jurisdictions from 2016 to 2020. ​ Earnings Per Common Share (“EPS”) ​ Treasury Stock ​ Mortgage Banking Derivatives . ​ Derivative Financial Instruments ​ If it is determined that the derivative instrument is not highly effective as a hedge, hedge accounting is discontinued, and the adjustment to fair value of the derivative instrument is recorded in earnings. For a derivative used to hedge changes in cash flows associated with forecasted transactions, the gain or loss on the effective portion of the derivative is deferred and reported as a component of accumulated other comprehensive income, which is a component of stockholders’ equity, until such time the hedged transaction affects earnings. For derivative instruments not accounted for as hedges, changes in fair value are recognized in noninterest income/expense. Counterparty risk with loan customers is managed through loan covenant agreements and, as such, does not have a significant impact on the fair value of the swaps. Counterparty risk with other banks is managed through bilateral collateralization agreements. Deferred gains and losses from derivatives not accounted for as hedges and that are terminated are amortized over the shorter of the original remaining term of the derivative or the remaining life of the underlying asset or liability. ​ Comprehensive Income ​ Recent Accounting Pronouncements : ​ ASU 2018-16, ASU 2020-04 and ASU 2021-01 - Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting. Reference Rate Reform ​ The Company formed a LIBOR transition team in 2019, and has developed a project plan to assess the use of alternative indexes and to

Acquisition

Acquisition	12 Months Ended
	Dec. 31, 2021
Acquisition
Acquisition	Note 2: Acquisition ​ On December 1, 2021, the Company completed its acquisition of West Suburban Bancorp, Inc. ("West Suburban"), a bank holding company, and its wholly owned subsidiary, West Suburban Bank, based in Lombard, Illinois, with operations throughout our existing market footprint. This acquisition brought increased scale and new markets to the Company, and provided new product offerings and line of business opportunities. At closing, the Company acquired $2.94 billion of assets, $1.50 billion of loans, $1.07 billion of securities, and $2.69 billion of deposits, net of fair value adjustments. Under the terms of the merger agreement, each outstanding share of West Suburban common stock was exchanged for 42.413 shares of Company common stock, plus $271.15 of cash. This resulted in merger consideration of $295.2 million, based on the closing price of the Company’s common stock on the date of acquisition, which consisted of 15.7 million shares of the Company’s common stock and $100.7 million of cash. Goodwill of $67.7 million associated with the acquisition was recorded by the Company, which was the result of expected synergies, operational efficiencies and other factors. ​ The acquisition of West Suburban has been accounted for as a business combination. We recorded the estimate of fair value based on initial valuations available at December 1, 2021. The determination of estimated fair value required management to make assumptions related to discount rates, expected future cash flows, market conditions and other future events that are often subjective in nature and may require adjustments, which can be subject to adjustment for up to one year after December 1, 2021. While the Company believes that the information available on the merger date provided a reasonable basis for estimating fair value, additional information and evidence may be provided during the first quarter of 2022 or later which will be utilized to finalize all valuations and record final adjustments during the one year subsequent measurement period. These adjustments may include: (i) changes in deferred tax assets or liabilities related to fair value estimates and changes in the expected realization of items considered to be net operating loss carryforwards due to tax calculations still in process, and (ii) changes in goodwill as a result of the net effect of any adjustments. None of the $67.7 million of goodwill recorded is expected to be deductible for income tax purposes. ​ The following table provides the purchase price allocation as of the December 1, 2021 merger date of the Company and West Suburban and the assets acquired and liabilities assumed at their estimated fair values as of that date, as recorded by the Company. ​ ​ ​ ​ ​ ​ West Suburban Acquisition Summary ​ ​ ​ As of Date of Acquisition ​ ​ ​ ​ ​ December 1, 2021 Assets ​ ​ ​ Cash and due from banks ​ $ 16,794 Interest bearing deposits with financial institutions ​ ​ 232,880 Securities available-for-sale and held-to maturity, at fair value ​ ​ 1,066,373 FHLBC stock ​ ​ 3,340 Loans ​ ​ 1,502,118 Premises and equipment ​ ​ 47,456 Other real estate owned ​ ​ 5,552 Core deposit intangible ​ ​ 14,772 Deferred tax assets ​ ​ 2,093 Other assets ​ ​ 52,710 Total assets ​ $ 2,944,088 ​ ​ ​ ​ Liabilities ​ ​ ​ Noninterest bearing demand ​ $ 409,141 Savings, NOW and money market ​ ​ 2,069,890 Time ​ ​ 215,205 Total deposits ​ ​ 2,694,236 Reserve for unfunded commitments ​ ​ 1,787 Other liabilities ​ ​ 20,629 Total liabilities ​ ​ 2,716,652 ​ ​ ​ ​ Cash consideration paid ​ ​ 100,679 Stock issued for acquisition ​ ​ 194,484 Total Liabilities Assumed and Cash and Stock Consideration Paid for Acquisition ​ $ 3,011,815 Goodwill ​ $ 67,727 ​ ​ Expenses related to the West Suburban acquisition totaled $13.2 million during the year ended December 31, 2021, and are reported within noninterest expense based on the line items impacted, which are primarily salaries and employee benefits, occupancy, furniture and equipment, computer and data processing, legal fees, and other expense in the Consolidated Statements of Income. ​ Purchased loans and leases that reflect a more-than-insignificant deterioration of credit from origination are considered PCD. For PCD loans and leases, the initial estimate of expected credit losses is recognized in the ACL on the date of acquisition using the same methodology as other loans and leases held-for-investment. The following table provides a summary of loans and leases purchased as part of the West Suburban acquisition which were individually evaluated and determined to have credit deterioration at acquisition. ​ ​ ​ ​ ​ ​ ​ As of West Suburban Acquired PCD Loans ​ December 1, 2021 Par value of acquired loans ​ $ 108,241 Allowance for credit losses ​ ​ (12,075) Non-credit discount ​ ​ (1,723) Purchase price of PCD loans at acquisition ​ $ 94,443 ​ The Company's operating results for the year ended December 31, 2021 includes the operating results of the acquired assets and assumed liabilities of West Suburban subsequent to the acquisition on December 1, 2021. The following table presents unaudited pro forma information as if the acquisition of West Suburban had occurred on January 1, 2020, under the “Unaudited Pro Forma” columns. The pro forma adjustments give effect to any change in interest income due to the accretion of the discount (premium) associated with the fair value adjustments to acquired loans and leases, any change in interest expense due to estimated premium amortization/discount accretion associated with the fair value adjustment to acquired interest-bearing deposits, and the amortization of the CDI that would have resulted had the deposits been acquired as of January 1, 2020. Pro forma results include Old Second and West Suburban acquisition-related expenses which primarily included, but were not limited to, severance costs, professional services, data processing fees, and advertising expenses totaling $25.1 million for the year ended December 31, 2021. The pro forma information does not necessarily reflect the results of operations that would have occurred had the Company acquired West Suburban on January 1, 2020. Furthermore, cost savings and other business synergies related to the acquisition are not reflected in the pro forma amounts. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unaudited Pro Forma for the Years Ended ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 Net interest income ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 166,495 ​ $ 165,283 Noninterest income ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 59,036 ​ ​ 48,937 Net income attributable to Old Second Bancorp, Inc. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 67,779 ​ ​ 12,349 ​

Cash and Due from Banks

Cash and Due from Banks	12 Months Ended
	Dec. 31, 2021
Cash and Due from Banks.
Cash and Due from Banks	Note 3: Cash and Due from Banks ​ Total cash and cash equivalents were $752.1 million and $329.9 million at December 31, 2021 and 2020, respectively . ​ As of March 26, 2020, the FRBC eliminated reserve requirements for certain depository institutions, including the Bank. As such, there was no reserve requirement as of December 31, 2020 or 2021. The nature of the Company’s business requires that it maintain amounts with other banks and federal funds which, at times, may exceed federally insured limits. Management monitors these correspondent relationships, and the Company has not experienced any losses in such accounts. ​

Securities

Securities	12 Months Ended
	Dec. 31, 2021
Securities
Securities	Note 4: Securities ​ The following table summarizes the amortized cost and fair value of the securities portfolio at December 31, and the corresponding amounts of gross unrealized gains and losses were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair December 31, 2021 Cost 1 Gains Losses ​ Value Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 202,251 ​ $ 125 ​ $ (37) ​ $ 202,339 U.S. government agencies ​ ​ 62,587 ​ ​ - ​ ​ (699) ​ ​ 61,888 U.S. government agencies mortgage-backed ​ ​ 172,016 ​ ​ 856 ​ ​ (570) ​ ​ 172,302 States and political subdivisions ​ ​ 240,793 ​ ​ 16,344 ​ ​ (672) ​ ​ 256,465 Corporate bonds ​ ​ 10,000 ​ ​ - ​ ​ (113) ​ ​ 9,887 Collateralized mortgage obligations ​ ​ 673,238 ​ ​ 2,014 ​ ​ (2,285) ​ ​ 672,967 Asset-backed securities ​ ​ 236,293 ​ ​ 1,245 ​ ​ (661) ​ ​ 236,877 Collateralized loan obligations ​ ​ 79,838 ​ ​ 3 ​ ​ (78) ​ ​ 79,763 Total securities available-for-sale ​ $ 1,677,016 ​ $ 20,587 ​ $ (5,115) ​ $ 1,692,488 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair December 31, 2020 Cost 1 Gains Losses ​ Value Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 4,014 ​ $ 103 ​ $ - ​ $ 4,117 U.S. government agencies ​ ​ 6,811 ​ ​ - ​ ​ (154) ​ ​ 6,657 U.S. government agencies mortgage-backed ​ ​ 16,098 ​ ​ 1,112 ​ ​ (1) ​ ​ 17,209 States and political subdivisions ​ ​ 229,352 ​ ​ 21,269 ​ ​ (1,362) ​ ​ 249,259 Collateralized mortgage obligations ​ ​ 53,999 ​ ​ 2,866 ​ ​ (280) ​ ​ 56,585 Asset-backed securities ​ ​ 130,959 ​ ​ 1,370 ​ ​ (511) ​ ​ 131,818 Collateralized loan obligations ​ ​ 30,728 ​ ​ 15 ​ ​ (210) ​ ​ 30,533 Total securities available-for-sale ​ $ 471,961 ​ $ 26,735 ​ $ (2,518) ​ $ 496,178 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 Excludes interest receivable of $4.3 million and $2.7 million at December 31, 2021 and December 31, 2020, respectively, that is recorded in other assets on the consolidated balance sheet. ​ FHLBC stock was $7.1 million and $3.7 million at December 31, 2021 and December 31, 2020 respectively. FRBC stock was $6.2 million at December 31, 2021 and December 31, 2020. Our FHLBC stock is necessary to maintain access to FHLBC advances. ​ Securities valued at $501.3 million as of December 31, 2021, were pledged to secure deposits and borrowings, and for other purposes, an increase from $335.8 million at year-end 2020, primarily due to the West Suburban acquisition in 2021. ​ The fair value, amortized cost and weighted average yield of debt securities at December 31, 2021, by contractual maturity, were as follows in the table below. Securities not due at a single maturity date are shown separately. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ ​ ​ Amortized ​ Average ​ ​ Fair ​ Securities available-for-sale Cost Yield ​ Value Due in one year or less ​ $ 8,671 ​ 1.24 % ​ $ 8,707 ​ Due after one year through five years ​ ​ 274,984 ​ 0.89 ​ ​ ​ 274,537 ​ Due after five years through ten years ​ ​ 43,770 ​ 2.43 ​ ​ ​ 45,470 ​ Due after ten years ​ ​ 188,206 ​ 2.98 ​ ​ ​ 201,865 ​ ​ ​ ​ 515,631 ​ 1.79 ​ ​ ​ 530,579 ​ Mortgage-backed and collateralized mortgage obligations ​ ​ 845,254 ​ 1.19 ​ ​ ​ 845,269 ​ Asset-backed securities ​ ​ 236,293 ​ 1.12 ​ ​ ​ 236,877 ​ Collateralized loan obligations ​ ​ 79,838 ​ 1.60 ​ ​ ​ 79,763 ​ Total securities available-for-sale ​ $ 1,677,016 ​ 1.38 % ​ $ 1,692,488 ​ ​ At December 31, 2021, the Company’s investments include asset-backed securities totaling $194.4 million that are backed by student loans originated under the Federal Family Education Loan program (“FFEL”). Under the FFEL, private lenders made federally guaranteed student loans to parents and students. While the program was modified several times before elimination in 2010, FFEL securities are generally guaranteed by the U.S. Department of Education (“DOE”) at not less than 97% of the principal amount of the loans. The guarantee will reduce to 85% if the DOE receives reimbursement requests in excess of 5% of insured loans; reimbursement will drop to 75% if reimbursement requests exceed 9% of insured loans. As of December 31, 2021, the likelihood of the decrease in the government guarantee was minimal as the average rate of reimbursement for 2021 was less than 1.0%. ​ As of December 31, 2021, the Company has no securities issued from one originator, other than the U.S. Government and its agencies, that individually amounted to over 10% of the Company’s stockholders equity. ​ Securities with unrealized losses with no corresponding allowance for credit losses at December 31, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows (in thousands except for number of securities): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less than 12 months ​ 12 months or more ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ in an unrealized loss position ​ in an unrealized loss position ​ Total ​ ​ Number of ​ Unrealized ​ Fair ​ Number of ​ Unrealized ​ Fair ​ Number of ​ Unrealized ​ Fair Securities available-for-sale Securities Losses Value Securities Losses Value Securities Losses Value U.S. Treasuries ​ 1 ​ $ 37 ​ $ 49,719 ​ - ​ $ - ​ $ - ​ 1 ​ $ 37 ​ $ 49,719 U.S. government agencies ​ 5 ​ $ 592 ​ $ 56,879 ​ 4 ​ $ 107 ​ $ 5,008 ​ 9 ​ $ 699 ​ $ 61,887 U.S. government agencies mortgage-backed ​ 63 ​ ​ 505 ​ ​ 78,711 ​ 1 ​ ​ 65 ​ ​ 1,663 ​ 64 ​ ​ 570 ​ ​ 80,374 States and political subdivisions ​ 7 ​ ​ 55 ​ ​ 8,430 ​ 1 ​ ​ 617 ​ ​ 4,051 ​ 8 ​ ​ 672 ​ ​ 12,481 Corporate bonds ​ 2 ​ ​ 113 ​ ​ 9,887 ​ - ​ ​ - ​ ​ - ​ 2 ​ ​ 113 ​ ​ 9,887 Collateralized mortgage obligations ​ 133 ​ ​ 2,285 ​ ​ 381,658 ​ - ​ ​ - ​ ​ - ​ 133 ​ ​ 2,285 ​ ​ 381,658 Asset-backed securities ​ 20 ​ ​ 608 ​ ​ 103,819 ​ 3 ​ ​ 53 ​ ​ 3,276 ​ 23 ​ ​ 661 ​ ​ 107,095 Collateralized loan obligations ​ 10 ​ ​ 35 ​ ​ 45,132 ​ 2 ​ ​ 43 ​ ​ 10,628 ​ 12 ​ ​ 78 ​ ​ 55,760 Total securities available-for-sale ​ 241 ​ $ 4,230 ​ $ 734,235 ​ 11 ​ $ 885 ​ $ 24,626 ​ 252 ​ $ 5,115 ​ $ 758,861 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less than 12 months ​ 12 months or more ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ in an unrealized loss position ​ in an unrealized loss position ​ Total ​ ​ Number of ​ Unrealized ​ ​ Fair ​ Number of ​ Unrealized ​ ​ Fair ​ Number of ​ Unrealized ​ ​ Fair Securities available-for-sale Securities Losses ​ Value Securities Losses ​ Value Securities Losses ​ Value U.S. government agencies ​ - ​ $ - ​ $ - ​ 4 ​ $ 154 ​ $ 6,657 ​ 4 ​ $ 154 ​ $ 6,657 U.S. government agencies mortgage-backed ​ 1 ​ ​ 1 ​ ​ 141 ​ - ​ ​ - ​ ​ - ​ 1 ​ ​ 1 ​ ​ 141 States and political subdivisions ​ - ​ ​ - ​ ​ - ​ 1 ​ ​ 1,362 ​ ​ 3,433 ​ 1 ​ ​ 1,362 ​ ​ 3,433 Collateralized mortgage obligations ​ 4 ​ ​ 279 ​ ​ 8,142 ​ 1 ​ ​ 1 ​ ​ 146 ​ 5 ​ ​ 280 ​ ​ 8,288 Asset-backed securities ​ 1 ​ ​ 2 ​ ​ 251 ​ 3 ​ ​ 509 ​ ​ 49,572 ​ 4 ​ ​ 511 ​ ​ 49,823 Collateralized loan obligations ​ 1 ​ ​ 31 ​ ​ 7,468 ​ 4 ​ ​ 179 ​ ​ 21,477 ​ 5 ​ ​ 210 ​ ​ 28,945 Total securities available-for-sale ​ 7 ​ $ 313 ​ $ 16,002 ​ 13 ​ $ 2,205 ​ $ 81,285 ​ 20 ​ $ 2,518 ​ $ 97,287 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The unrealized loss attributable to our collateralized loan obligations are the result of spread widening in that sector due to the current economic environment, specifically rising interest rates. The unrealized loss attributable to our U.S. government agencies is associated with our SBA positions. Shortly after purchase a structural change in the SBA program occurred that led to higher prepayments which negatively affected these positions. The unrealized loss attributable to states and political subdivisions, collateralized mortgage obligations, and asset-backed securities are due to limited liquidity as a result of a few securities with uncommon structures and lesser known issuers. The asset-backed securities are primarily backed by student loans under the FFEL program, these securities are 97% guaranteed by U.S. DOE and have a long history of no credit losses. At December 31, 2021, we have no intent to sell any securities that were in an unrealized loss position nor is it expected that we would be required to sell the securities prior to their anticipated recovery . ​ The following table presents net realized gains (losses) on securities available-for-sale for the years ended: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ ​ ​ December 31, ​ Securities available-for-sale 2021 2020 2019 ​ Proceeds from sales of securities ​ $ 605,846 ​ $ 18,006 ​ $ 191,298 ​ Gross realized gains on securities ​ 270 ​ 17 ​ 5,521 ​ Gross realized losses on securities ​ (38) ​ (42) ​ (1,010) ​ Net realized gains (losses) ​ $ 232 ​ $ (25) ​ $ 4,511 ​ Income tax (expense) benefit on net realized gains (losses) ​ $ (65) ​ $ 7 ​ $ (1,267) ​ Effective tax rate applied ​ ​ 28.0 % ​ 28.0 % ​ 28.1 % ​

Loans and Allowance for Credit

Loans and Allowance for Credit Losses on Loans	12 Months Ended
	Dec. 31, 2021
Loans and Allowance for Credit Losses on Loans
Loans and Allowance for Credit Losses on Loans	Note 5: Loans and Allowance for Credit Losses on Loans ​ The composition of loans by portfolio segment as of December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 December 31, 2020 Commercial 1 ​ $ 771,474 ​ $ 407,159 Leases ​ ​ 176,031 ​ ​ 141,601 Commercial real estate - Investor ​ ​ 957,389 ​ ​ 582,042 Commercial real estate - Owner occupied ​ ​ 574,384 ​ ​ 333,070 Construction ​ ​ 206,132 ​ ​ 98,486 Residential real estate - Investor ​ ​ 63,399 ​ ​ 56,137 Residential real estate - Owner occupied ​ ​ 213,248 ​ ​ 116,388 Multifamily ​ ​ 309,164 ​ ​ 189,040 HELOC ​ ​ 115,664 ​ ​ 80,908 HELOC - Purchased ​ ​ 10,626 ​ ​ 19,487 Other 2 ​ ​ 24,437 ​ ​ 10,533 Total loans ​ ​ 3,421,948 ​ ​ 2,034,851 Allowance for credit losses on loans ​ ​ (44,281) ​ ​ (33,855) Net loans 3 ​ $ 3,377,667 ​ $ 2,000,996 ​ 1 Includes $38.4 million and $74.1 million of PPP loans outstanding at December 31, 2021 and 2020, respectively. ​ 2 Unless otherwise noted, the “Other” segment includes consumer loans and overdrafts in this table and in subsequent tables within Note 5 - Loans and Allowance for Credit Losses on Loans. ​ 3 Excludes accrued interest receivable of $9.2 million and $7.0 million at December 31, 2021 and December 31, 2020, respectively, which is recorded in other assets on the consolidated balance sheet. ​ It is the policy of the Company to review each prospective credit prior to making a loan in order to determine if an adequate level of security or collateral has been obtained. The type of collateral, when required, will vary from liquid assets to real estate. The Company’s access to collateral, in the event of borrower default, is assured through adherence to lending laws, the Company’s lending standards and credit monitoring procedures. Although the Bank makes loans primarily within its market area, there are no significant concentrations of loans where the customers’ ability to honor loan terms is dependent upon a single economic sector. The real estate related categories above represent 71.6% and 72.5% of the portfolio at December 31, 2021 and December 31, 2020, respectively, and include a mix of owner and non-owner occupied, residential, construction and multifamily loans. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table represent the activity in the ACL for loans for the year ended December 31, 2021 and 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impact of ​ Provision for ​ ​ ​ ​ ​ ​ ​ ​ Beginning ​ WSB Acquisition ​ (Release of) ​ ​ ​ ​ ​ Ending Allowance for credit losses Balance with PCD Loans Credit Losses Charge-offs Recoveries Balance ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ $ 2,812 ​ $ 7,161 ​ $ 2,389 ​ $ 963 ​ $ 352 ​ $ 11,751 Leases ​ ​ 3,888 ​ ​ - ​ ​ (339) ​ ​ 69 ​ ​ - ​ ​ 3,480 Commercial real estate - Investor ​ ​ 9,205 ​ ​ 1,877 ​ ​ 4,657 ​ ​ 2,724 ​ ​ 78 ​ ​ 13,093 Commercial real estate - Owner occupied ​ ​ 2,251 ​ ​ 2,771 ​ ​ (845) ​ ​ 1,797 ​ ​ 235 ​ ​ 2,615 Construction ​ ​ 4,054 ​ ​ 102 ​ ​ (783) ​ ​ - ​ ​ - ​ ​ 3,373 Residential real estate - Investor ​ ​ 1,740 ​ ​ 23 ​ ​ (1,294) ​ ​ - ​ ​ 291 ​ ​ 760 Residential real estate - Owner occupied ​ ​ 2,714 ​ ​ 136 ​ ​ (176) ​ ​ - ​ ​ 158 ​ ​ 2,832 Multifamily ​ ​ 3,625 ​ ​ - ​ ​ 233 ​ ​ 183 ​ ​ - ​ ​ 3,675 HELOC ​ ​ 1,749 ​ ​ 5 ​ ​ 408 ​ ​ 17 ​ ​ 234 ​ ​ 2,379 HELOC - Purchased ​ ​ 199 ​ ​ - ​ ​ (68) ​ ​ - ​ ​ - ​ ​ 131 Other ​ ​ 1,618 ​ ​ - ​ ​ (1,387) ​ ​ 180 ​ ​ 141 ​ ​ 192 Ending Balance, December 31, 2021 ​ $ 33,855 ​ $ 12,075 ​ $ 2,795 ​ $ 5,933 ​ $ 1,489 ​ $ 44,281 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impact of ​ Provision for ​ ​ ​ ​ ​ ​ Allowance for credit losses ​ Beginning ​ Adopting ​ (Release of) ​ ​ ​ ​ ​ Ending ​ Balance ASC 326 Credit Losses Charge-offs Recoveries Balance Commercial ​ $ 3,015 ​ $ (292) ​ $ 72 ​ $ 39 ​ $ 56 ​ $ 2,812 Leases ​ ​ 1,262 ​ ​ 501 ​ ​ 2,233 ​ ​ 206 ​ ​ 98 ​ ​ 3,888 Commercial real estate - Investor ​ ​ 6,218 ​ ​ (741) ​ ​ 4,075 ​ ​ 512 ​ ​ 165 ​ ​ 9,205 Commercial real estate - Owner occupied ​ ​ 3,678 ​ ​ (848) ​ ​ 487 ​ ​ 1,763 ​ ​ 697 ​ ​ 2,251 Construction ​ ​ 513 ​ ​ 1,334 ​ ​ 2,095 ​ ​ 60 ​ ​ 172 ​ ​ 4,054 Residential real estate - Investor ​ ​ 601 ​ ​ 740 ​ ​ 350 ​ ​ 8 ​ ​ 57 ​ ​ 1,740 Residential real estate - Owner occupied ​ ​ 1,257 ​ ​ 1,320 ​ ​ (107) ​ ​ 43 ​ ​ 287 ​ ​ 2,714 Multifamily ​ ​ 1,444 ​ ​ 1,732 ​ ​ 449 ​ ​ - ​ ​ - ​ ​ 3,625 HELOC ​ ​ 1,161 ​ ​ 1,526 ​ ​ (1,198) ​ ​ 127 ​ ​ 387 ​ ​ 1,749 HELOC - Purchased ​ ​ - ​ ​ - ​ ​ 265 ​ ​ 66 ​ ​ - ​ ​ 199 Other ​ ​ 640 ​ ​ 607 ​ ​ 445 ​ ​ 244 ​ ​ 170 ​ ​ 1,618 Ending Balance, December 31, 2020 ​ $ 19,789 ​ $ 5,879 ​ $ 9,166 ​ $ 3,068 ​ $ 2,089 ​ $ 33,855 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table presents activity in the allowance for loan and lease losses for the years ended December 31, 2019, as determined in accordance with ASC 310 prior to the adoption of ASU 2016-13: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Provision ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning ​ for Loan ​ ​ ​ ​ ​ Ending Allowance for loan and lease losses: ​ Balance Losses Charge-offs Recoveries Balance Commercial ​ ​ ​ ​ $ 2,832 ​ $ 218 ​ $ 109 ​ $ 74 ​ $ 3,015 Leases ​ ​ ​ ​ ​ 734 ​ ​ 577 ​ ​ 49 ​ ​ - ​ ​ 1,262 Commercial real estate - Investor ​ ​ ​ ​ ​ 6,339 ​ ​ (497) ​ ​ 303 ​ ​ 679 ​ ​ 6,218 Commercial real estate - Owner occupied ​ ​ ​ ​ ​ 3,515 ​ ​ 874 ​ ​ 716 ​ ​ 5 ​ ​ 3,678 Construction ​ ​ ​ ​ ​ 969 ​ ​ (448) ​ ​ 9 ​ ​ 1 ​ ​ 513 Residential real estate - Investor ​ ​ ​ ​ ​ 554 ​ ​ 43 ​ ​ 7 ​ ​ 11 ​ ​ 601 Residential real estate - Owner occupied ​ ​ ​ ​ ​ 1,377 ​ ​ (86) ​ ​ 111 ​ ​ 77 ​ ​ 1,257 Multifamily ​ ​ ​ ​ ​ 616 ​ ​ 813 ​ ​ - ​ ​ 15 ​ ​ 1,444 HELOC ​ ​ ​ ​ ​ 1,449 ​ ​ (351) ​ ​ 109 ​ ​ 172 ​ ​ 1,161 HELOC - Purchased ​ ​ ​ ​ ​ - ​ ​ 229 ​ ​ 229 ​ ​ - ​ ​ - Other ​ ​ ​ ​ ​ 621 ​ ​ 228 ​ ​ 409 ​ ​ 200 ​ ​ 640 Ending Balance, December 31, 2019 ​ ​ ​ ​ $ 19,006 ​ $ 1,600 ​ $ 2,051 ​ $ 1,234 ​ $ 19,789 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table presents the collateral dependent loans and the related ACL allocated by segment of loans as of December 31: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accounts ​ ​ ​ ​ ​ ​ ​ ACL December 31, 2021 ​ Real Estate ​ Receivable ​ Equipment ​ Other ​ Total ​ Allocation Commercial ​ $ 1,986 ​ $ 9,901 ​ $ - ​ $ - ​ $ 11,887 ​ $ 2,677 Leases ​ ​ - ​ ​ - ​ ​ 3,249 ​ ​ 505 ​ ​ 3,754 ​ ​ 811 Commercial real estate - Investor ​ ​ 5,693 ​ ​ - ​ ​ - ​ ​ - ​ ​ 5,693 ​ ​ - Commercial real estate - Owner occupied ​ ​ 9,147 ​ ​ - ​ ​ - ​ ​ 2,490 ​ ​ 11,637 ​ ​ 362 Construction ​ ​ 2,104 ​ ​ - ​ ​ - ​ ​ - ​ ​ 2,104 ​ ​ 992 Residential real estate - Investor ​ ​ 925 ​ ​ - ​ ​ - ​ ​ - ​ ​ 925 ​ ​ - Residential real estate - Owner occupied ​ ​ 4,271 ​ ​ - ​ ​ - ​ ​ - ​ ​ 4,271 ​ ​ 276 Multifamily ​ ​ 1,845 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,845 ​ ​ 75 HELOC ​ ​ 826 ​ ​ - ​ ​ - ​ ​ - ​ ​ 826 ​ ​ 190 HELOC - Purchased ​ ​ 180 ​ ​ - ​ ​ - ​ ​ - ​ ​ 180 ​ ​ - Other ​ ​ - ​ ​ - ​ ​ - ​ ​ 7 ​ ​ 7 ​ ​ 4 Total ​ $ 26,977 ​ $ 9,901 ​ $ 3,249 ​ $ 3,002 ​ $ 43,129 ​ $ 5,387 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accounts ​ ​ ​ ​ ​ ​ ​ ACL December 31, 2020 ​ Real Estate ​ Receivable ​ Equipment ​ Other ​ Total ​ Allocation Commercial ​ $ - ​ $ 1,070 ​ $ - ​ $ 55 ​ $ 1,125 ​ $ 56 Leases ​ ​ - ​ ​ - ​ ​ 2,377 ​ ​ 597 ​ ​ 2,974 ​ ​ 880 Commercial real estate - Investor ​ ​ 4,179 ​ ​ - ​ ​ - ​ ​ - ​ ​ 4,179 ​ ​ 84 Commercial real estate - Owner occupied ​ ​ 9,726 ​ ​ - ​ ​ - ​ ​ - ​ ​ 9,726 ​ ​ 195 Construction ​ ​ 1,891 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,891 ​ ​ 952 Residential real estate - Investor ​ ​ 928 ​ ​ - ​ ​ - ​ ​ - ​ ​ 928 ​ ​ - Residential real estate - Owner occupied ​ ​ 3,535 ​ ​ - ​ ​ - ​ ​ - ​ ​ 3,535 ​ ​ 10 Multifamily ​ ​ 3,838 ​ ​ - ​ ​ - ​ ​ - ​ ​ 3,838 ​ ​ 378 HELOC ​ ​ 1,053 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,053 ​ ​ 78 HELOC - Purchased ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Other ​ ​ - ​ ​ - ​ ​ - ​ ​ 4 ​ ​ 4 ​ ​ 4 Total ​ $ 25,150 ​ $ 1,070 ​ $ 2,377 ​ $ 656 ​ $ 29,253 ​ $ 2,637 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Aged analysis of past due loans by class of loans as of December 31, 2021 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 90 days or ​ ​ ​ ​ ​ ​ ​ ​ 90 Days or ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Greater Past ​ ​ 30-59 Days ​ 60-89 Days ​ Greater Past ​ Total Past ​ ​ ​ ​ ​ ​ ​ Due and December 31, 2021 1 ​ Past Due Past Due Due Due Current Total Loans Accruing Commercial ​ $ 3,407 ​ $ 1,413 ​ $ 1,828 ​ $ 6,648 ​ $ 764,826 ​ $ 771,474 ​ $ 1,396 Leases ​ ​ 125 ​ ​ - ​ ​ 1,571 ​ ​ 1,696 ​ ​ 174,335 ​ ​ 176,031 ​ ​ - Commercial real estate - Investor ​ ​ - ​ ​ 267 ​ ​ 1,107 ​ ​ 1,374 ​ ​ 956,015 ​ ​ 957,389 ​ ​ - Commercial real estate - Owner occupied ​ ​ 2,324 ​ ​ 500 ​ ​ 4,848 ​ ​ 7,672 ​ ​ 566,712 ​ ​ 574,384 ​ ​ 1,594 Construction ​ ​ 854 ​ ​ - ​ ​ - ​ ​ 854 ​ ​ 205,278 ​ ​ 206,132 ​ ​ - Residential real estate - Investor ​ ​ 395 ​ ​ 470 ​ ​ 792 ​ ​ 1,657 ​ ​ 61,742 ​ ​ 63,399 ​ ​ 23 Residential real estate - Owner occupied ​ ​ 1,994 ​ ​ 591 ​ ​ 3,077 ​ ​ 5,662 ​ ​ 207,586 ​ ​ 213,248 ​ ​ 97 Multifamily ​ ​ - ​ ​ 1,046 ​ ​ - ​ ​ 1,046 ​ ​ 308,118 ​ ​ 309,164 ​ ​ - HELOC ​ ​ 193 ​ ​ 23 ​ ​ 218 ​ ​ 434 ​ ​ 115,230 ​ ​ 115,664 ​ ​ - HELOC - Purchased ​ ​ - ​ ​ - ​ ​ 180 ​ ​ 180 ​ ​ 10,446 ​ ​ 10,626 ​ ​ - Other ​ ​ 50 ​ ​ 46 ​ ​ 23 ​ ​ 119 ​ ​ 24,318 ​ ​ 24,437 ​ ​ - Total ​ $ 9,342 ​ $ 4,356 ​ $ 13,644 ​ $ 27,342 ​ $ 3,394,606 ​ $ 3,421,948 ​ $ 3,110 ​ 1 Loans modified under the CARES Act are considered current if they are in compliance with the modified terms. ​ There were 509 loans which totaled $242.7 million modified under the CARES Act in 2020 and 2021. As of December 31, 2021, seven loans of the original 509 loans deferred, or $7.8 million, had an active deferral request and were in compliance with modified terms; 502 loans which totaled $234.9 million had resumed payments or paid off. As of December 31, 2021, six of the seven deferred loans, or $7.7 million, are in nonaccrual status. ​ ​ ​ ​ ​ ​ ​ The following table presents the age analysis of past due loans as of December 31, 2020 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 90 days or ​ ​ ​ ​ ​ ​ ​ ​ 90 Days or ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Greater Past ​ ​ 30-59 Days ​ 60-89 Days ​ Greater Past ​ Total Past ​ ​ ​ ​ ​ ​ ​ Due and December 31, 2020 1 ​ Past Due Past Due Due Due Current Total Loans Accruing Commercial ​ $ - ​ $ - ​ $ 52 ​ $ 52 ​ $ 407,107 ​ $ 407,159 ​ $ - Leases ​ ​ 613 ​ ​ 59 ​ ​ 316 ​ ​ 988 ​ ​ 140,613 ​ ​ 141,601 ​ ​ 163 Commercial real estate - Investor ​ ​ 1,439 ​ ​ - ​ ​ 1,108 ​ ​ 2,547 ​ ​ 579,495 ​ ​ 582,042 ​ ​ - Commercial real estate - Owner occupied ​ ​ 1,848 ​ ​ 958 ​ ​ 7,309 ​ ​ 10,115 ​ ​ 322,955 ​ ​ 333,070 ​ ​ - Construction ​ ​ 1,237 ​ ​ - ​ ​ - ​ ​ 1,237 ​ ​ 97,249 ​ ​ 98,486 ​ ​ - Residential real estate - Investor ​ ​ 1,022 ​ ​ 20 ​ ​ 484 ​ ​ 1,526 ​ ​ 54,611 ​ ​ 56,137 ​ ​ 157 Residential real estate - Owner occupied ​ ​ 859 ​ ​ 286 ​ ​ 717 ​ ​ 1,862 ​ ​ 114,526 ​ ​ 116,388 ​ ​ 114 Multifamily ​ ​ 3,282 ​ ​ 467 ​ ​ - ​ ​ 3,749 ​ ​ 185,291 ​ ​ 189,040 ​ ​ - HELOC ​ ​ 549 ​ ​ 50 ​ ​ 206 ​ ​ 805 ​ ​ 80,103 ​ ​ 80,908 ​ ​ - HELOC - Purchased ​ ​ 47 ​ ​ - ​ ​ - ​ ​ 47 ​ ​ 19,440 ​ ​ 19,487 ​ ​ - Other ​ ​ 20 ​ ​ - ​ ​ - ​ ​ 20 ​ ​ 10,513 ​ ​ 10,533 ​ ​ - Total ​ $ 10,916 ​ $ 1,840 ​ $ 10,192 ​ $ 22,948 ​ $ 2,011,903 ​ $ 2,034,851 ​ $ 434 ​ 1 Loans modified under the CARES Act are considered current if they are in compliance with the modified terms. ​ The following table presents all nonaccrual loans and loans on nonaccrual for which there was no related allowance for credit losses as of: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nonaccrual loan detail December 31, 2021 With no ACL December 31, 2020 With no ACL Commercial ​ $ 11,894 ​ $ 9,217 ​ $ 1,125 ​ $ 1,070 Leases ​ ​ 3,754 ​ ​ 2,943 ​ ​ 2,638 ​ ​ 309 Commercial real estate - Investor ​ ​ 5,694 ​ ​ 5,694 ​ ​ 1,632 ​ ​ 1,632 Commercial real estate - Owner occupied ​ ​ 11,637 ​ ​ 11,205 ​ ​ 9,262 ​ ​ 6,780 Construction ​ ​ 160 ​ ​ 160 ​ ​ - ​ ​ - Residential real estate - Investor ​ ​ 876 ​ ​ 876 ​ ​ 928 ​ ​ 928 Residential real estate - Owner occupied ​ ​ 4,898 ​ ​ 4,622 ​ ​ 3,206 ​ ​ 3,206 Multifamily ​ ​ 1,573 ​ ​ 1,573 ​ ​ 2,437 ​ ​ 2,437 HELOC ​ ​ 862 ​ ​ 672 ​ ​ 1,052 ​ ​ 845 HELOC - Purchased ​ ​ 180 ​ ​ 180 ​ ​ - ​ ​ - Other ​ ​ 3 ​ ​ 3 ​ ​ - ​ ​ - Total ​ $ 41,531 ​ $ 37,145 ​ $ 22,280 ​ $ 17,207 ​ The Company recognized $280,000 of interest on nonaccrual loans during the year ended December 31, 2021. The amount of accrued interest reversed against interest income totaled ​ Credit Quality Indicators: ​ The Company categorizes loans into credit risk categories based on current financial information, overall debt service coverage, comparison against industry averages, historical payment experience, and current economic trends. This analysis includes loans with outstanding balances or commitments greater than $50,000 and excludes homogeneous loans such as home equity lines of credit and residential mortgages. Loans with a classified risk rating are reviewed quarterly regardless of size or loan type. The Company uses the following definitions for classified risk ratings: ​ Special Mention. ​ Substandard. ​ Doubtful. ​ Credits that are not covered by the definitions above are pass credits, which are not considered to be adversely rated. ​ Credit Quality Indicators by class of loans as of December 31, 2021 were as follows in the vintage table below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Converted ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ To Term ​ ​ ​ 2021 2020 2019 2018 2017 Prior Loans Loans Total Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 192,258 ​ $ 50,638 ​ $ 38,614 ​ $ 28,177 ​ $ 5,176 ​ $ 10,945 ​ $ 408,394 ​ $ 30 ​ $ 734,232 Special Mention ​ ​ 44 ​ ​ 84 ​ ​ 694 ​ ​ - ​ ​ - ​ ​ - ​ ​ 3,708 ​ ​ - ​ ​ 4,530 Substandard ​ ​ 9,498 ​ ​ 4,048 ​ ​ 14,121 ​ ​ 326 ​ ​ - ​ ​ 75 ​ ​ 4,644 ​ ​ - ​ ​ 32,712 Total commercial ​ ​ 201,800 ​ ​ 54,770 ​ ​ 53,429 ​ ​ 28,503 ​ ​ 5,176 ​ ​ 11,020 ​ ​ 416,746 ​ ​ 30 ​ ​ 771,474 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Leases ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 83,402 ​ ​ 44,129 ​ $ 32,259 ​ ​ 8,950 ​ ​ 1,170 ​ ​ 2,367 ​ ​ - ​ ​ - ​ ​ 172,277 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ 2,834 ​ ​ 623 ​ ​ - ​ ​ 297 ​ ​ - ​ ​ - ​ ​ 3,754 Total leases ​ ​ 83,402 ​ ​ 44,129 ​ ​ 35,093 ​ ​ 9,573 ​ ​ 1,170 ​ ​ 2,664 ​ ​ - ​ ​ - ​ ​ 176,031 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate - Investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 315,247 ​ ​ 233,964 ​ ​ 147,511 ​ ​ 85,049 ​ ​ 64,810 ​ ​ 55,523 ​ ​ 18,602 ​ ​ - ​ ​ 920,706 Special Mention ​ ​ 15,466 ​ ​ - ​ ​ 10,550 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 26,016 Substandard ​ ​ 2,238 ​ ​ 2,378 ​ ​ 451 ​ ​ 181 ​ ​ 3,612 ​ ​ 1,807 ​ ​ - ​ ​ - ​ ​ 10,667 Total commercial real estate - investor ​ ​ 332,951 ​ ​ 236,342 ​ ​ 158,512 ​ ​ 85,230 ​ ​ 68,422 ​ ​ 57,330 ​ ​ 18,602 ​ ​ - ​ ​ 957,389 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate - Owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 220,324 ​ ​ 96,607 ​ ​ 61,511 ​ ​ 60,915 ​ ​ 54,236 ​ ​ 59,887 ​ ​ 2,522 ​ ​ - ​ ​ 556,002 Special Mention ​ ​ - ​ ​ - ​ ​ 2,953 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 2,953 Substandard ​ ​ 8,318 ​ ​ 942 ​ ​ 1,686 ​ ​ - ​ ​ 1,251 ​ ​ 3,232 ​ ​ - ​ ​ - ​ ​ 15,429 Total commercial real estate - owner occupied ​ ​ 228,642 ​ ​ 97,549 ​ ​ 66,150 ​ ​ 60,915 ​ ​ 55,487 ​ ​ 63,119 ​ ​ 2,522 ​ ​ - ​ ​ 574,384 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 88,620 ​ ​ 65,629 ​ ​ 37,169 ​ ​ 2,727 ​ ​ 477 ​ ​ 1,193 ​ ​ 1,143 ​ ​ - ​ ​ 196,958 Special Mention ​ ​ - ​ ​ 2,138 ​ ​ 4,932 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 7,070 Substandard ​ ​ 160 ​ ​ - ​ ​ - ​ ​ 1,944 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 2,104 Total construction ​ ​ 88,780 ​ ​ 67,767 ​ ​ 42,101 ​ ​ 4,671 ​ ​ 477 ​ ​ 1,193 ​ ​ 1,143 ​ ​ - ​ ​ 206,132 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate - Investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 13,371 ​ ​ 9,758 ​ ​ 13,084 ​ ​ 6,392 ​ ​ 7,059 ​ ​ 10,602 ​ ​ 1,868 ​ ​ - ​ ​ 62,134 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ 121 ​ ​ 144 ​ ​ - ​ ​ 197 ​ ​ 385 ​ ​ 418 ​ ​ - ​ ​ - ​ ​ 1,265 Total residential real estate - investor ​ ​ 13,492 ​ ​ 9,902 ​ ​ 13,084 ​ ​ 6,589 ​ ​ 7,444 ​ ​ 11,020 ​ ​ 1,868 ​ ​ - ​ ​ 63,399 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate - Owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 48,009 ​ ​ 31,912 ​ ​ 20,990 ​ ​ 13,304 ​ ​ 30,562 ​ ​ 60,661 ​ ​ 2,052 ​ ​ - ​ ​ 207,490 Special Mention ​ ​ 659 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 659 Substandard ​ ​ 322 ​ ​ 183 ​ ​ 6 ​ ​ 1,219 ​ ​ 176 ​ ​ 3,193 ​ ​ - ​ ​ - ​ ​ 5,099 Total residential real estate - owner occupied ​ ​ 48,990 ​ ​ 32,095 ​ ​ 20,996 ​ ​ 14,523 ​ ​ 30,738 ​ ​ 63,854 ​ ​ 2,052 ​ ​ - ​ ​ 213,248 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Multifamily ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 109,175 ​ ​ 71,748 ​ ​ 39,293 ​ ​ 61,190 ​ ​ 11,399 ​ ​ 7,117 ​ ​ 64 ​ ​ - ​ ​ 299,986 Special Mention ​ ​ - ​ ​ - ​ ​ 6,900 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 6,900 Substandard ​ ​ 433 ​ ​ - ​ ​ - ​ ​ 1,543 ​ ​ 302 ​ ​ - ​ ​ - ​ ​ - ​ ​ 2,278 Total multifamily ​ ​ 109,608 ​ ​ 71,748 ​ ​ 46,193 ​ ​ 62,733 ​ ​ 11,701 ​ ​ 7,117 ​ ​ 64 ​ ​ - ​ ​ 309,164 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HELOC ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 907 ​ ​ 2,091 ​ ​ 2,131 ​ ​ 805 ​ ​ 1,667 ​ ​ 1,869 ​ ​ 104,843 ​ ​ - ​ ​ 114,313 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 108 ​ ​ - ​ ​ 108 Substandard ​ ​ - ​ ​ - ​ ​ - ​ ​ 17 ​ ​ 12 ​ ​ 196 ​ ​ 1,018 ​ ​ - ​ ​ 1,243 Total HELOC ​ ​ 907 ​ ​ 2,091 ​ ​ 2,131 ​ ​ 822 ​ ​ 1,679 ​ ​ 2,065 ​ ​ 105,969 ​ ​ - ​ ​ 115,664 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HELOC - Purchased ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 10,446 ​ ​ - ​ ​ - ​ ​ 10,446 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 180 ​ ​ - ​ ​ - ​ ​ 180 Total HELOC - purchased ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 10,626 ​ ​ - ​ ​ - ​ ​ 10,626 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 8,659 ​ ​ 1,099 ​ ​ 437 ​ ​ 254 ​ ​ 1,414 ​ ​ 5,358 ​ ​ 7,206 ​ ​ - ​ ​ 24,427 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ 3 ​ ​ - ​ ​ 7 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 10 Total other ​ ​ 8,659 ​ ​ 1,102 ​ ​ 437 ​ ​ 261 ​ ​ 1,414 ​ ​ 5,358 ​ ​ 7,206 ​ ​ - ​ ​ 24,437 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 1,079,972 ​ ​ 607,575 ​ ​ 392,999 ​ ​ 267,763 ​ ​ 177,970 ​ ​ 225,968 ​ ​ 546,694 ​ ​ 30 ​ ​ 3,298,971 Special Mention ​ ​ 16,169 ​ ​ 2,222 ​ ​ 26,029 ​ ​ - ​ ​ - ​ ​ - ​ ​ 3,816 ​ ​ - ​ ​ 48,236 Substandard ​ ​ 21,090 ​ ​ 7,698 ​ ​ 19,098 ​ ​ 6,057 ​ ​ 5,738 ​ ​ 9,398 ​ ​ 5,662 ​ ​ - ​ ​ 74,741 Total loans ​ $ 1,117,231 ​ $ 617,495 ​ $ 438,126 ​ $ 273,820 ​ $ 183,708 ​ $ 235,366 ​ $ 556,172 ​ $ 30 ​ $ 3,421,948 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Credit quality indicators by loan class at December 31, 2020 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Converted ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ To Term ​ ​ ​ 2020 2019 2018 2017 2016 Prior Loans Loans Total Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 101,796 ​ $ 42,294 ​ $ 14,519 ​ $ 6,265 ​ $ 1,825 ​ $ 1,691 ​ $ 230,388 ​ $ - ​ $ 398,778 Special Mention ​ ​ 5,130 ​ ​ 425 ​ ​ 68 ​ ​ - ​ ​ 3 ​ ​ - ​ ​ 76 ​ ​ - ​ ​ 5,702 Substandard ​ ​ 273 ​ ​ 52 ​ ​ 1,524 ​ ​ - ​ ​ - ​ ​ - ​ ​ 830 ​ ​ - ​ ​ 2,679 Total commercial ​ ​ 107,199 ​ ​ 42,771 ​ ​ 16,111 ​ ​ 6,265 ​ ​ 1,828 ​ ​ 1,691 ​ ​ 231,294 ​ ​ - ​ ​ 407,159 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Leases ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 56,605 ​ ​ 52,168 ​ ​ 16,830 ​ ​ 6,545 ​ ​ 5,242 ​ ​ 651 ​ ​ - ​ ​ - ​ ​ 138,041 Special Mention ​ ​ 175 ​ ​ 163 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 338 Substandard ​ ​ - ​ ​ 1,434 ​ ​ 798 ​ ​ 59 ​ ​ 450 ​ ​ 481 ​ ​ - ​ ​ - ​ ​ 3,222 Total leases ​ ​ 56,780 ​ ​ 53,765 ​ ​ 17,628 ​ ​ 6,604 ​ ​ 5,692 ​ ​ 1,132 ​ ​ - ​ ​ - ​ ​ 141,601 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate - Investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 173,781 ​ ​ 158,677 ​ ​ 92,156 ​ ​ 66,762 ​ ​ 55,963 ​ ​ 15,966 ​ ​ 1,319 ​ ​ - ​ ​ 564,624 Special Mention ​ ​ 2,394 ​ ​ 9,592 ​ ​ 220 ​ ​ - ​ ​ 95 ​ ​ - ​ ​ - ​ ​ - ​ ​ 12,301 Substandard ​ ​ 2,709 ​ ​ 1,126 ​ ​ 71 ​ ​ - ​ ​ 340 ​ ​ 871 ​ ​ - ​ ​ - ​ ​ 5,117 Total commercial real estate - investor ​ ​ 178,884 ​ ​ 169,395 ​ ​ 92,447 ​ ​ 66,762 ​ ​ 56,398 ​ ​ 16,837 ​ ​ 1,319 ​ ​ - ​ ​ 582,042 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate - Owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 72,605 ​ ​ 52,809 ​ ​ 73,719 ​ ​ 45,315 ​ ​ 50,000 ​ ​ 25,507 ​ ​ 1,324 ​ ​ - ​ ​ 321,279 Special Mention ​ ​ 604 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 604 Substandard ​ ​ 1,564 ​ ​ 2,154 ​ ​ 1,780 ​ ​ 1,664 ​ ​ 501 ​ ​ 3,524 ​ ​ - ​ ​ - ​ ​ 11,187 Total commercial real estate - owner occupied ​ ​ 74,773 ​ ​ 54,963 ​ ​ 75,499 ​ ​ 46,979 ​ ​ 50,501 ​ ​ 29,031 ​ ​ 1,324 ​ ​ - ​ ​ 333,070 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 50,170 ​ ​ 24,163 ​ ​ 7,203 ​ ​ 539 ​ ​ 218 ​ ​ 1,261 ​ ​ 9,702 ​ ​ - ​ ​ 93,256 Special Mention ​ ​ 38 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 38 Substandard ​ ​ - ​ ​ 3,135 ​ ​ 2,057 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 5,192 Total construction ​ ​ 50,208 ​ ​ 27,298 ​ ​ 9,260 ​ ​ 539 ​ ​ 218 ​ ​ 1,261 ​ ​ 9,702 ​ ​ - ​ ​ 98,486 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate - Investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 9,371 ​ ​ 14,194 ​ ​ 8,522 ​ ​ 7,775 ​ ​ 2,431 ​ ​ 11,184 ​ ​ 1,144 ​ ​ - ​ ​ 54,621 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ 349 ​ ​ - ​ ​ 610 ​ ​ - ​ ​ 91 ​ ​ 466 ​ ​ - ​ ​ - ​ ​ 1,516 Total residential real estate - investor ​ ​ 9,720 ​ ​ 14,194 ​ ​ 9,132 ​ ​ 7,775 ​ ​ 2,522 ​ ​ 11,650 ​ ​ 1,144 ​ ​ - ​ ​ 56,137 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate - Owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 18,308 ​ ​ 23,450 ​ ​ 10,808 ​ ​ 15,409 ​ ​ 10,394 ​ ​ 31,325 ​ ​ 2,654 ​ ​ - ​ ​ 112,348 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ 47 ​ ​ - ​ ​ 412 ​ ​ 219 ​ ​ 526 ​ ​ 2,836 ​ ​ - ​ ​ - ​ ​ 4,040 Total residential real estate - owner occupied ​ ​ 18,355 ​ ​ 23,450 ​ ​ 11,220 ​ ​ 15,628 ​ ​ 10,920 ​ ​ 34,161 ​ ​ 2,654 ​ ​ - ​ ​ 116,388 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Multifamily ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 40,671 ​ ​ 30,849 ​ ​ 44,301 ​ ​ 38,133 ​ ​ 12,147 ​ ​ 7,735 ​ ​ 197 ​ ​ - ​ ​ 174,033 Special Mention ​ ​ - ​ ​ 6,901 ​ ​ - ​ ​ 548 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 7,449 Substandard ​ ​ 69 ​ ​ - ​ ​ 4,254 ​ ​ 927 ​ ​ 118 ​ ​ 2,190 ​ ​ - ​ ​ - ​ ​ 7,558 Total multifamily ​ ​ 40,740 ​ ​ 37,750 ​ ​ 48,555 ​ ​ 39,608 ​ ​ 12,265 ​ ​ 9,925 ​ ​ 197 ​ ​ - ​ ​ 189,040 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HELOC ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 2,511 ​ ​ 2,174 ​ ​ 1,679 ​ ​ 2,120 ​ ​ 504 ​ ​ 803 ​ ​ 69,483 ​ ​ - ​ ​ 79,274 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 94 ​ ​ - ​ ​ 94 Substandard ​ ​ - ​ ​ - ​ ​ 86 ​ ​ 37 ​ ​ 271 ​ ​ 91 ​ ​ 1,055 ​ ​ - ​ ​ 1,540 Total HELOC ​ ​ 2,511 ​ ​ 2,174 ​ ​ 1,765 ​ ​ 2,157 ​ ​ 775 ​ ​ 894 ​ ​ 70,632 ​ ​ - ​ ​ 80,908 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HELOC - Purchased ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 19,487 ​ ​ - ​ ​ - ​ ​ 19,487 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Total HELOC - purchased ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 19,487 ​ ​ - ​ ​ - ​ ​ 19,487 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 1,555 ​ ​ 574 ​ ​ 569 ​ ​ 229 ​ ​ 559 ​ ​ 341 ​ ​ 6,702 ​ ​ - ​ ​ 10,529 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ 4 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 4 Total other ​ ​ 1,555 ​ ​ 574 ​ ​ 573 ​ ​ 229 ​ ​ 559 ​ ​ 341 ​ ​ 6,702 ​ ​ - ​ ​ 10,533 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 527,373 ​ ​ 401,352 ​ ​ 270,306 ​ ​ 189,092 ​ ​ 139,283 ​ ​ 115,951 ​ ​ 322,913 ​ ​ - ​ ​ 1,966,270 Special Mention ​ ​ 8,341 ​ ​ 17,081 ​ ​ 288 ​ ​ 548 ​ ​ 98 ​ ​ - ​ ​ 170 ​ ​ - ​ ​ 26,526 Substandard ​ ​ 5,011 ​ ​ 7,901 ​ ​ 11,596 ​ ​ 2,906 ​ ​ 2,297 ​ ​ 10,459 ​ ​ 1,885 ​ ​ - ​ ​ 42,055 Total loans ​ $ 540,725 ​ $ 426,334 ​ $ 282,190 ​ $ 192,546 ​ $ 141,678 ​ $ 126,410 ​ $ 324,968 ​ $ - ​ $ 2,034,851 ​ ​ The Company had $488,000 and $546,000 in consumer mortgage loans in the process of foreclosure as of December 31, 2021 and December 31, 2020, respectively. ​ Troubled debt restructurings (“TDRs”) are loans for which the contractual terms have been modified and both of these conditions exist: (1) there is a concession to the borrower and (2) the borrower is experiencing financial difficulties. Loans are restructured on a case-by-case basis during the loan collection process with modifications generally initiated at the request of the borrower. These modifications may include reduction in interest rates, extension of term, deferrals of principal, and other modifications. The Bank participates in the U.S. Department of the Treasury’s (the “Treasury”) Home Affordable Modification Program (“HAMP”) which gives qualifying homeowners an opportunity to refinance into more affordable monthly payments. ​ The amount of expected loan losses for TDRs is measured based upon the present value of expected future cash flows discounted at the loan’s effective interest rate, the fair value of the underlying collateral less applicable selling costs, or the observable market price of the loan. ​ The CARES Act, as extended by certain provisions of the Consolidated Appropriations Act of 2021, permits banks to suspend requirements under GAAP for loan modifications to borrowers affected by COVID-19 that may otherwise be characterized as troubled debt restructurings and suspend any determination related thereto if (i) the borrower was not more than 30 days past due as of December 31, 2019, (ii) the modifications are related to COVID-19, and (iii) the modification occurs between March 1, 2020 and the earlier of 60 days after the date of termination of the national emergency or January 1, 2022. ​ The number of loans that were modified during the period, including the amortized cost basis pre- and post-modification are summarized as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ TDR Modifications ​ TDR Modifications ​ ​ ​ Three Months Ended December 31, 2021 ​ Year Ended December 31, 2021 ​ ​ ​ # of ​ Pre-modification ​ Post-modification ​ # of ​ Pre-modification ​ Post-modification ​ ​ contracts recorded investment recorded investment contracts recorded investment recorded investment Troubled debt restructurings ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate - Owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HAMP 1 ​ - ​ $ - ​ $ - ​ - ​ $ - ​ $ - ​ Total ​ - ​ $ - ​ $ - ​ - ​ $ - ​ $ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ TDR Modifications ​ TDR Modifications ​ ​ ​ Three Months Ended December 31, 2020 ​ Year Ended December 31, 2020 ​ ​ ​ # of ​ Pre-modification ​ Post-modification ​ # of ​ Pre-modification ​ Post-modification ​ ​ contracts recorded investment recorded investment contracts recorded investment recorded investment Troubled debt restructurings ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate - Owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HAMP 1 ​ 1 ​ $ 154 ​ $ 153 ​ 3 ​ $ 410 ​ $ 395 ​ Total ​ 1 ​ $ 154 ​ $ 153 ​ 3 ​ $ 410 ​ $ 395 ​ ​ 1 HAMP: Home Affordable Modification Program ​ TDRs are classified as being in default on a case-by-case basis when they fail to be in compliance with the modified terms. There were no TDRs that defaulted during year 2021 and 2020. ​ As of December 31, 2021 and 2020, there were no commitments to lend additional funds to debtors whose terms have been modified in a TDR. ​ There were no loans purchased and/or sold during 2021 and 2020. ​ Loans to principal officers, directors, and their affiliates, which are made in the ordinary course of business, as of December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 Beginning balance ​ $ 783 ​ $ 961 ​ New loans, including acquired related party loans ​ 11,836 ​ 644 ​ Repayments and other reductions ​ (2,457) ​ (822) ​ Change in related party status ​ - ​ - ​ Ending balance ​ $ 10,162 ​ $ 783 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2021
Other Real Estate Owned
Other Real Estate Owned	Note 6: Other Real Estate Owned ​ Details related to the activity in the other real estate owned (“OREO”) portfolio, net of valuation reserve, for the periods presented are itemized in the following table. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended ​ ​ December 31, Other real estate owned 2021 2020 2019 ​ Balance at beginning of period ​ $ 2,474 ​ $ 5,004 ​ $ 7,175 ​ Property additions, net of acquisition adjustments ​ ​ 5,748 ​ ​ 898 ​ ​ 872 ​ Less: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Proceeds from property disposals, net of participation purchase and of gains/losses ​ ​ 5,787 ​ ​ 3,071 ​ ​ 2,515 ​ Period valuation (write-up)/write-down ​ ​ 79 ​ ​ 357 ​ ​ 519 ​ Other adjustments ​ ​ - ​ ​ - ​ ​ 9 ​ Balance at end of period ​ $ 2,356 ​ $ 2,474 ​ $ 5,004 ​ ​ Activity in the valuation allowance was as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended ​ December 31, ​ 2021 2020 2019 Balance at beginning of period ​ $ 1,643 ​ $ 6,712 ​ $ 8,027 ​ Provision for unrealized losses ​ ​ 79 ​ ​ 357 ​ ​ 519 ​ Reductions taken on sales ​ ​ (543) ​ ​ (5,426) ​ ​ (1,834) ​ Balance at end of period ​ $ 1,179 ​ $ 1,643 ​ $ 6,712 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Expenses related to OREO, net of lease revenue includes: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended ​ ​ December 31, ​ ​ 2021 2020 2019 ​ (Gain) on sales, net ​ $ (41) ​ $ (204) ​ $ (264) ​ Provision for unrealized losses ​ ​ 79 ​ ​ 357 ​ ​ 519 ​ Operating expenses ​ ​ 133 ​ ​ 535 ​ ​ 173 ​ Less: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Lease revenue ​ ​ 4 ​ ​ 37 ​ ​ 5 ​ Net OREO expense ​ $ 167 ​ $ 651 ​ $ 423 ​ ​

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2021
Premises and Equipment
Premises and Equipment	Note 7: Premises and Equipment ​ Premises and equipment at December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 ​ ​ ​ ​ Accumulated ​ ​ ​ ​ Accumulated ​ ​ ​ ​ ​ ​ ​ Depreciation/ ​ Net Book ​ ​ ​ ​ Depreciation/ ​ Net Book ​ ​ ​ Cost ​ Amortization ​ Value ​ Cost ​ Amortization ​ Value ​ Land ​ $ 42,375 ​ $ - ​ $ 42,375 ​ $ 18,501 ​ $ - ​ $ 18,501 ​ ​ Buildings ​ 59,313 ​ 26,959 ​ 32,354 ​ 43,579 ​ 25,909 ​ 17,670 ​ ​ Leasehold improvements ​ 2,324 ​ 1,004 ​ 1,320 ​ 2,324 ​ 699 ​ 1,625 ​ ​ Furniture and equipment ​ 57,533 ​ 45,577 ​ 11,956 ​ 51,461 ​ 43,780 ​ 7,681 ​ ​ Total Premises and Equipment ​ $ 161,545 ​ $ 73,540 ​ $ 88,005 ​ $ 115,865 ​ $ 70,388 ​ $ 45,477 ​ ​ ​ Total premises and equipment increased $42.5 million at December 31, 2021, compared to December 31, 2020, due to the West Suburban acquisition. Subsequent to the acquisition, the Company evaluated all branches for overlap and potential closure. Thirteen locations were identified for closure and potential future sale, which are expected to occur in the second and third quarters of 2022. ​ The Company performs assessments of the recoverability of long-lived assets when events or changes in circumstances indicate the branch carrying value may not be recoverable. For the year ended December 31, 2021, impairment charges of $3.8 million were recorded within occupancy, furniture and equipment expense in the Consolidated Statements of Income related to four branches identified for closure. ​

Deposits

Deposits	12 Months Ended
	Dec. 31, 2021
Deposits
Deposits	Note 8: Deposits ​ Major classifications of deposits at December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 Noninterest bearing demand ​ $ 1,428,055 ​ $ 909,505 ​ Savings ​ ​ 1,826,346 ​ ​ 399,057 ​ NOW accounts ​ ​ 605,056 ​ ​ 486,612 ​ Money market accounts ​ ​ 1,102,965 ​ ​ 316,465 ​ Certificates of deposit of less than $100,000 ​ ​ 287,238 ​ ​ 200,107 ​ Certificates of deposit of $100,000 through $250,000 ​ ​ 147,854 ​ ​ 164,982 ​ Certificates of deposit of more than $250,000 ​ ​ 68,718 ​ ​ 60,345 ​ Total deposits ​ $ 5,466,232 ​ $ 2,537,073 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The Company had $10.1 million and $59.1 million in listing service deposits as of December 31, 2021 and 2020. Deposits held by senior officers and directors, including their related interests, totaled $26.8 million and $2.3 million as of December 31, 2021 and 2020. ​ At December 31, 2021, scheduled maturities of time deposits were as follows: ​ ​ ​ ​ ​ ​ 2022 $ 337,822 ​ 2023 ​ 78,697 ​ 2024 ​ 38,599 ​ 2025 ​ 30,858 ​ 2026 ​ 17,834 ​ Total time deposits ​ $ 503,810 ​ ​

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2021
Borrowings
Borrowings	Note 9: Borrowings ​ The following table is a summary of borrowings as of December 31, 2021 and 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 Securities sold under repurchase agreements ​ $ 50,337 ​ $ 66,980 ​ Junior subordinated debentures 1 ​ ​ 25,773 ​ ​ 25,773 ​ Subordinated debentures ​ ​ 59,212 ​ ​ - ​ Senior notes ​ ​ 44,480 ​ ​ 44,375 ​ Notes payable and other borrowings ​ ​ 19,074 ​ ​ 23,393 ​ Total borrowings ​ $ 198,876 ​ $ 160,521 ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 See Note 10: Junior Subordinated Debentures, below. ​ The Company enters into deposit sweep transactions where the transaction amounts are secured by pledged securities. These transactions consistently mature within 1 to 90 days from the transaction date and are governed by sweep repurchase agreements. All sweep repurchase agreements are treated as financings secured by U.S. government agencies, collateralized mortgage obligations, mortgage-backed securities and/or highly-rated issues of State and political subdivisions, and had a carrying amount of $50.3 million and $67.0 million at December 31, 2021 and 2020, respectively. The fair value of the pledged collateral was $113.0 million and $94.4 million at December 31, 2021 and December 31, 2020, respectively. At December 31, 2021, there were no customers with secured balances exceeding 10% of stockholders’ equity. ​ Total FHLBC advances are generally limited to the lower of 35% of total assets and the amount of acceptable collateral adjusted for applicable funding percentages as determined by the FHLBC. As of December 31, 2021 and 2020, the Bank had no outstanding short-term FHLBC advances. As of December 31, 2021, FHLBC stock owned by the Bank was valued at $7.1 million, and the principal balance of loans pledged was $536.9 million. As of December 31, 2020, FHLBC stock owned by the Bank was valued at $3.7 million, the fair value of securities pledged to the FHLBC was $54.7 million, and the principal balance of loans pledged was $625.8 million. In 2018, the Bank assumed $23.4 million of long-term FHLBC advances with the ABC acquisition. At December 31, 2021, one remaining long-term FHLBC advance, which is included in notes payable and other borrowings, has a total outstanding balance of $6.1 million and is scheduled to mature over the next 4.25 years with an interest rate of 2.83% . At December 31, 2020, the long-term FHLBC advance had a total outstanding balance of $6.4 million and was scheduled to mature over the next 5.25 years with interest rate of 2.83% . Based on the total amount of securities and loans pledged, the Bank had total borrowing capacity of $390.4 million. Adjusting for the outstanding advances and letters of credit, the Bank had a remaining funding availability of $313.1 million on December 31, 2021. ​ In the second quarter of 2021, we entered into Subordinated Note Purchase Agreements with certain qualified institutional buyers pursuant to which we sold and issued $60.0 million in aggregate principal amount of our 3.50% Fixed-to-Floating Rate Subordinated Notes due April 15, 2031 (the “Notes”). We sold the Notes to eligible purchasers in a private offering, and the proceeds of this issuance are intended to be used for general corporate purposes, which may include, without limitation, the redemption of existing senior debt, common stock repurchases and strategic acquisitions. The Notes bear interest at a fixed annual rate of 3.50% through April 14, 2026, payable semi-annually in arrears. As of April 15, 2026 forward, the interest rate on the Notes will generally reset quarterly to a rate equal to Three-Month Term SOFR (as defined by the Note) plus 273 basis points, payable quarterly in arrears. The Notes have a stated maturity of April 15, 2031, and are redeemable, in whole are in part, on April 15, 2026, or any interest payment date thereafter, and at any time upon the occurrence of certain events. As of December 31, 2021, we had $59.2 million of subordinated debentures outstanding, net of deferred issuance costs ​ The Company also has $44.5 million of senior notes outstanding, net of deferred issuance costs, as of December 31, 2021 and $44.4 million as of December 31, 2020. The senior notes were issued in 2016, had an original maturity of ten years , and terms include interest payable semiannually at 5.75% for five years . Beginning December 31, 2021, the senior debt will pay interest at a floating rate, with interest payable quarterly at three month LIBOR plus 385 basis points. The effective interest rate at December 31, 2021 was 6.06% . The notes are redeemable, in whole or in part, at the option of the Company, beginning with the interest payment date on December 31, 2021, and on any floating rate interest payment date thereafter, at a redemption price equal to 100% of the principal amount of the notes plus accrued and unpaid interest. As of December 31, 2021 and 2020, unamortized debt issuance costs related to the senior notes were $520,000 and $625,000 , respectively, and are included as a reduction of the balance of the senior notes on the Consolidated Balance Sheets. These deferred issuance costs will be amortized to interest expense over the ten year term of the notes and included in the Consolidated Statements of Income. ​ On February 24, 2020, the Company originated a $20.0 million term note, of which $13.0 million is outstanding as of December 31, 2021, with a correspondent bank, the proceeds of which were used in the redemption of the Company’s 7.80% cumulative trust preferred securities issued by Old Second Capital Trust I and related junior subordinated debentures. See the discussion in Note 10 – Junior Subordinated Debentures . The term note was issued for a three year term at one-month LIBOR plus 175 basis points, requires principal and interest payments quarterly, with no prepayment penalties; any remaining balances are due on February 24, 2023. The effective interest rate at December 31, 2021 was 1.85% . The balance of this note is included within Notes payable and other borrowings on the Consolidated Balance Sheet. The Company also has an undrawn line of credit of $20.0 million with a correspondent bank to be used for short-term funding needs; advances under this line can be outstanding up to 360 days from the date of issuance. This line of credit has not been utilized since early 2019. ​ Scheduled maturities and weighted average rates of borrowings for the years ended December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ Average ​ ​ ​ ​ Average ​ Balance Rate Balance Rate 2021 ​ $ - - ​ $ 70,980 ​ 0.46 % 2022 ​ ​ 58,337 ​ 0.37 % ​ 4,000 1.91 ​ 2023 ​ 9,000 1.85 ​ 9,000 1.91 ​ 2024 ​ - - ​ - ​ - ​ 2025 ​ - - ​ - - ​ 2026 ​ 46,554 5.88 ​ - - ​ Thereafter ​ 84,985 3.89 ​ 76,541 5.24 ​ Total borrowings ​ $ 198,876 3.23 % $ 160,521 2.86 % ​

Junior Subordinated Debentures

Junior Subordinated Debentures	12 Months Ended
	Dec. 31, 2021
Junior Subordinated Debentures.
Junior Subordinated Debentures	Note 10: Junior Subordinated Debentures ​ On March 2, 2020, the Company redeemed 7.80% cumulative trust preferred securities issued by Old Second Capital Trust I (“OSBCP”) and related debentures, which totaled $32.6 million. These debentures were originally issued in 2003 for a term of 30 years at 7.80% , and subject to regulatory approval, were able to be called in whole or in part by the Company after June 30, 2008. The Company received regulatory approval to redeem the debentures in early 2020, and notified OSBCP stockholders of the redemption in late January 2020. Cash disbursed for the redemption, including accrued interest on the debentures, totaled $33.0 million, or $10.13 per OSBCP share. The OSBCP redemption was funded by cash on hand and the $20.0 million term note discussed in Note 9 – Borrowings . Upon redemption of the junior subordinated debentures related to OSBCP in March 2020, the Company recognized the remaining unamortized debt issuance costs of $635,000 . ​ The Company sold $25.0 million of cumulative trust preferred securities through a private placement completed by an additional, unconsolidated subsidiary, Old Second Capital Trust II, in April 2007. These trust preferred securities also mature in 30 years , but subject to regulatory approval, can be called in whole or in part on a quarterly basis commencing June 15, 2017. The quarterly cash distributions on the securities were fixed at 6.77% through June 15, 2017, and float at 150 basis points over three-month LIBOR thereafter. Upon conversion to a floating rate on June 16, 2017, a cash flow hedge was initiated, whereby the Company swapped the three-month LIBOR for a fixed rate of 2.8% . Accordingly, the effective rate of the instrument was 4.4% as of December 31, 2021 and 2020. The Company issued a new $25.8 million subordinated debenture to the Old Second Capital Trust II in return for the aggregate net proceeds of this trust preferred offering. The interest rate and payment frequency on the debenture are equivalent to the cash distribution basis on the trust preferred securities. ​ The Trust I and Trust II the debentures issued by the Company are disclosed on the Consolidated Balance Sheets as junior subordinated debentures and the related interest expense for each issuance is included in the Consolidated Statements of Income. As of December 31, 2021 and 2020, unamortized debt issuance costs related to the junior subordinated debentures were $1,000 respectively, and are included as a reduction to the balance of the junior subordinated debentures on the Consolidated Balance Sheets. ​ Under the terms of the subordinated debenture issued to Old Second Capital Trust II, the Company is allowed to defer payments of interest for 20 quarterly periods without default or penalty, but such amounts continue to accrue. Also during a deferral period, the Company generally may not pay cash dividends on or repurchase its common stock or preferred stock. As of December 31, 2021, the Company is current on the payments due on these securities. ​

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2021
Income Taxes
Income Taxes	Note 11: Income Taxes ​ Income tax expense (benefit) for the years ending December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 Current federal ​ $ 750 ​ $ 6,269 ​ $ 4,815 Current state ​ ​ 594 ​ ​ 3,960 ​ ​ 1,151 Deferred federal ​ ​ 4,445 ​ ​ (135) ​ ​ 3,177 Deferred state ​ ​ 2,034 ​ ​ (511) ​ ​ 3,259 Total income tax expenses ​ $ 7,823 ​ $ 9,583 ​ $ 12,402 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following were the components of the deferred tax assets and liabilities as of December 31: ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 Allowance for credit losses ​ $ 15,601 ​ $ 11,058 Deferred compensation ​ ​ 1,378 ​ ​ 1,093 Goodwill amortization/impairment ​ ​ 980 ​ ​ 2,212 Stock based compensation ​ ​ 971 ​ ​ 1,356 Business combination adjustments ​ ​ 940 ​ ​ 255 OREO write-downs ​ ​ 573 ​ ​ 614 Federal recognized built-in loss ("RBIL") carryforward ​ ​ 493 ​ ​ 142 State net operating loss and RBIL carryforward ​ ​ - ​ ​ 60 Other assets ​ ​ 2,129 ​ ​ 2,182 Total deferred tax assets ​ ​ 23,065 ​ ​ 18,972 ​ ​ ​ ​ ​ ​ ​ Accumulated depreciation on premises and equipment ​ ​ (1,701) ​ ​ (1,237) Mortgage servicing rights ​ ​ (2,113) ​ ​ (1,261) Amortization of core deposit intangible ​ ​ (4,550) ​ ​ (171) State tax benefits ​ ​ (641) ​ ​ (930) Securities ​ ​ (2,620) ​ ​ - Other liabilities ​ ​ (1,931) ​ ​ (1,481) Total deferred tax liabilities ​ ​ (13,556) ​ ​ (5,080) Net deferred tax asset before adjustments related to other comprehensive income ​ ​ 9,509 ​ ​ 13,892 Tax effect of adjustments related to other comprehensive income ​ ​ (3,410) ​ ​ (5,771) Net deferred tax asset ​ $ 6,099 ​ $ 8,121 ​ ​ ​ ​ ​ ​ ​ ​ At December 31, 2021, the Company had $2,348,000 of federal net operating loss carryforward, which may be carried forward indefinitely, and no state net operating loss carryforward. ​ The components of the provision for deferred income tax expense (benefit) for the years ending December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 Provision for credit losses $ (78) ​ $ (4,976) ​ $ (279) Deferred compensation ​ 1,388 ​ ​ (186) ​ ​ (242) Amortization of core deposit intangible ​ (18) ​ ​ 27 ​ ​ 14 Stock based compensation ​ 385 ​ ​ 266 ​ ​ (245) Business combination adjustments ​ 80 ​ ​ 1,292 ​ ​ 985 OREO write-downs ​ 1,543 ​ ​ 1,317 ​ ​ 406 Federal net operating loss and RBIL carryforward ​ (351) ​ ​ 198 ​ ​ 1,859 State net operating loss and RBIL carryforward ​ 60 ​ ​ 266 ​ ​ 3,708 Depreciation ​ (1,737) ​ ​ 491 ​ ​ 303 Mortgage servicing rights ​ 852 ​ ​ (518) ​ ​ (431) Goodwill amortization/impairment ​ 1,232 ​ ​ 1,244 ​ ​ 1,242 State tax benefits ​ (491) ​ ​ 3 ​ ​ (912) Securities ​ 4,188 ​ ​ - ​ ​ - Other, net ​ (574) ​ ​ (70) ​ ​ 28 Total deferred tax (benefit) expense $ 6,479 ​ $ (646) ​ $ 6,436 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Effective tax rates differ from federal statutory rates applied to financial statement income for the years ended December 31, due to the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 Tax at statutory federal income tax rate ​ $ 5,852 ​ $ 7,856 ​ $ 10,890 Nontaxable interest income, net of disallowed interest deduction ​ ​ (1,069) ​ ​ (1,067) ​ ​ (1,409) BOLI income ​ ​ (292) ​ ​ (271) ​ ​ (480) State income taxes, net of federal benefit ​ ​ 2,054 ​ ​ 2,570 ​ ​ 3,496 Stock based compensation ​ ​ 54 ​ ​ 297 ​ ​ (207) Transaction costs ​ ​ 396 ​ ​ - ​ ​ - Other, net ​ ​ 828 ​ ​ 198 ​ ​ 112 Total tax at effective tax rate ​ $ 7,823 ​ $ 9,583 ​ $ 12,402 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The Company evaluated positive and negative evidence in order to determine if it was more likely than not that the deferred tax asset would be recovered through future income. Significant positive evidence evaluated included recent and projected earnings, significantly improved asset quality and an improved capital position. No significant negative evidence was noted.

Equity Compensation Plans

Equity Compensation Plans	12 Months Ended
	Dec. 31, 2021
Equity Compensation Plans
Equity Compensation Plans	Note 12: Equity Compensation Plans ​ Stock-based awards are outstanding under the Company’s 2019 Equity Incentive Plan, as amended and restated (the “2019 Plan”). The 2019 Plan was originally approved at the May 2019 annual stockholders’ meeting and authorized 600,000 shares, and at the May 2021 annual stockholders’ meeting, the Company obtained stockholder approval to increase the number of shares of common stock authorized for issuance under the plan by 1,200,000 shares, from 600,000 shares to 1,800,000 shares. Following the approval of the 2019 Plan, no further awards will be granted under any other prior plan. ​ The 2019 Plan authorizes the granting of qualified stock options, non-qualified stock options, restricted stock, restricted stock units, and stock appreciation rights (“SARs”). Awards may be granted to selected directors, officers, employees or eligible service providers under the 2019 Plan at the discretion of the Compensation Committee of the Company’s Board of Directors. As of December 31, 2021, 1,395,981 shares remained available for issuance under the 2019 Plan. ​ The Company granted 16,500 stock options in 2009 under the 2008 Equity Incentive Plan, and there are no remaining outstanding stock options as of December 31, 2021. No stock options were granted in 2009 through 2021. There were 4,500 stock options exercised during 2019 and no stock options exercised during 2020 or 2021. At December 31, 2021, the Company had no unrecognized compensation cost related to unvested stock options as all stock options have fully vested. ​ A summary of stock option activity as of each year is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 ​ 2019 Intrinsic value of options exercised ​ $ - $ - $ 27 Cash received from option exercises ​ ​ - ​ - ​ 32 Tax benefit realized from option exercises ​ ​ - ​ - ​ 5 Weighted average fair value of options granted ​ ​ - ​ - ​ - ​ Generally, restricted stock and restricted stock units granted under the 2019 Plan vest three years from the grant date, but the Compensation Committee of the Company’s Board of Directors has discretionary authority to change the terms of particular awards including the vesting schedule. ​ Under the 2019 Plan, unless otherwise provided in an award agreement, upon the occurrence of a change in control, all stock options and SARs then held by the participant will become fully exercisable immediately if, and all stock awards and cash incentive awards will become fully earned and vested immediately if, (i) the 2019 Plan is not an obligation of the successor entity following a change in control or (ii) the 2019 Plan is an obligation of the successor entity following a change in control and the participant incurs a termination of service without cause or for good reason following the change in control. Notwithstanding the immediately preceding sentence, if the vesting of an award is conditioned upon the achievement of performance measures, then such vesting will generally be subject to the following: if, at the time of the change in control, the performance measures are less than 50% attained (pro rata based upon the time of the period through the change in control), the award will become vested and exercisable on a fractional basis with the numerator being equal to the percentage of attainment and the denominator being 50%; and if, at the time of the change in control, the performance measures are at least 50% attained (pro rata based upon the time of the period through the change in control), the award will become fully earned and vested immediately upon the change in control. ​ Awards of restricted stock units under the 2019 Plan generally entitled holders to voting and dividend rights upon grant and are subject to forfeiture until certain restrictions have lapsed including employment for a specific period. Awards of restricted stock units under the 2019 Plan are also subject to forfeiture until certain restrictions have lapsed including employment for a specific period, but do not entitle holders to voting rights until the restricted period ends and shares are transferred in connection with the units. ​ Total compensation cost that has been charged for the 2019 Plan and prior plans was $1.4 million, $2.1 million and $2.5 million for the years ending December 31, 2021, 2020 and 2019 respectively. ​ There were 274,881 and 140,944 restricted stock units granted during the years ending December 31, 2021 and 2020, respectively. Compensation expense is recognized over the vesting period of the restricted stock unit based on the market value of the award on the grant date. A summary of changes in the Company’s unvested restricted awards for the years ending December 31, 2021, is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ ​ ​ ​ Weighted ​ ​ Restricted ​ Average ​ ​ Stock Shares ​ Grant Date ​ and Units Fair Value Unvested at January 1 ​ 532,609 ​ $ 13.15 Granted ​ 274,881 ​ ​ 11.61 Vested ​ (199,492) ​ ​ 13.88 Forfeited ​ (67,692) ​ ​ 13.54 Unvested at December 31 ​ 540,306 ​ $ 12.42 ​ ​ ​ ​ ​ ​ ​ Total unrecognized compensation cost of restricted stock unit awards was $3.1 million as of December 31, 2021, which is expected to be recognized over a weighted-average period of 1.96 years. ​ ​

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2021
Earnings Per Share
Earnings Per Share	Note 13: Earnings Per Share ​ The earnings per share, both basic and diluted, are included below as of December 31, (in thousands except for per share data): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 Basic earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average common shares outstanding ​ ​ ​ 30,208,663 ​ ​ 29,623,333 ​ ​ 29,891,046 Net income ​ ​ $ 20,044 ​ $ 27,825 ​ $ 39,455 Basic earnings per share ​ ​ $ 0.66 ​ $ 0.94 ​ $ 1.32 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Diluted earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average common shares outstanding ​ ​ ​ 30,208,663 ​ ​ 29,623,333 ​ ​ 29,891,046 Dilutive effect of unvested restricted awards 1 ​ ​ ​ 529,199 ​ ​ 550,739 ​ ​ 525,302 Diluted average common shares outstanding ​ ​ ​ 30,737,862 ​ ​ 30,174,072 ​ ​ 30,416,348 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Income ​ ​ $ 20,044 ​ $ 27,825 ​ $ 39,455 Diluted earnings per share ​ ​ $ 0.65 ​ $ 0.92 ​ $ 1.30 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 Includes the common stock equivalents for restricted share rights that are dilutive . ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Commitments

Commitments	12 Months Ended
	Dec. 31, 2021
Commitments
Commitments	Note 14: Commitments ​ In the normal course of business, there are outstanding commitments that are not reflected in the Consolidated Financial Statements. Commitments include financial instruments that involve, to varying degrees, elements of credit, interest rate, and liquidity risk. In management’s opinion, these do not represent unusual risks and management does not anticipate significant losses as a result of these transactions. The Company uses the same credit policies in making commitments and conditional obligations for borrowers as it does for on-balance sheet instruments. ​ The following table is a summary of financial instrument commitments as of December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ December 31, 2020 ​ ​ Fixed Variable Total Fixed Variable Total Letters of credit: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Borrower: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial standby ​ $ 384 ​ $ 17,474 ​ $ 17,858 ​ $ 329 ​ $ 9,051 ​ $ 9,380 ​ Commercial standby ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ Performance standby ​ ​ 456 ​ ​ 14,907 ​ ​ 15,363 ​ ​ 356 ​ ​ 4,517 ​ ​ 4,873 ​ ​ ​ ​ 840 ​ ​ 32,381 ​ ​ 33,221 ​ ​ 685 ​ ​ 13,568 ​ ​ 14,253 ​ Non-borrower: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Performance standby ​ ​ - ​ ​ 67 ​ ​ 67 ​ ​ - ​ ​ 67 ​ ​ 67 ​ Total letters of credit ​ $ 840 ​ $ 32,448 ​ $ 33,288 ​ $ 685 ​ $ 13,635 ​ $ 14,320 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unused loan commitments: ​ $ 84,225 ​ $ 895,665 ​ $ 979,890 ​ $ 88,883 ​ $ 316,298 ​ $ 405,181 ​ ​ The Bank occupies facilities under long-term operating leases, some of which include provisions for future rent increases. In addition, the Company leases space at sites that house automatic teller machines (ATMs). The Company also receives rental income on certain leased properties. As of December 31, 2021, aggregate future minimum rental income to be received under noncancelable leases totaled $425,000. Total facility net operating lease expense or revenue recorded under all operating leases was a net expense of $361,000, $223,000, and $248,000 in 2021, 2020 and 2019, respectively. Total ATM lease expense, including the costs related to servicing those ATM’s, was $1.2 million, $1.0 million, and $916,000 in 2021, 2020 and 2019, respectively. ​ ​ The following table below is the estimated aggregate minimum annual rental commitments at December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2027 ​ 2022 ​ 2023 ​ 2024 ​ 2025 ​ 2026 ​ and there after Rental commitment $ 864 ​ $ 792 ​ $ 771 ​ $ 738 ​ $ 662 ​ $ 2,635 ​ Legal proceedings ​ The Company and its subsidiaries, from time to time, pursue collection suits and other actions that arise in the ordinary course of business against their borrowers and are defendants in legal actions arising from normal business activities. Management, after consultation with legal counsel, believes that the ultimate liabilities, if any, resulting from these actions will not have a material adverse effect on the financial position of the Bank or on the consolidated financial position of the Company based on all known information at this time.

Regulatory & Capital Matters

Regulatory & Capital Matters	12 Months Ended
	Dec. 31, 2021
Regulatory & Capital Matters
Regulatory & Capital Matters	Note 15: Regulatory & Capital Matters ​ The Bank is subject to the risk-based capital regulatory guidelines, which include the methodology for calculating the risk-weighted Bank assets, developed by the Office of the Comptroller of the Currency (the “OCC”) and the other bank regulatory agencies. In connection with the current economic environment, the Bank’s current level of nonperforming assets and the risk-based capital guidelines, the Bank’s board of directors’ guidelines are for the Bank to maintain a Tier 1 leverage capital ratio at or above eight percent (8%) and a total risk-based capital ratio at or above twelve percent (12%). The Bank currently exceeds those thresholds. ​ Bank holding companies are required to maintain minimum levels of capital in accordance with capital guidelines implemented by the Board of Governors of the Federal Reserve System. The general bank and holding company capital adequacy guidelines in force as of the periods reported are shown in the accompanying table, as are the capital ratios of the Company and the Bank, as of December 31, 2021, and December 31, 2020. ​ In July 2013, the U.S. federal banking authorities issued final rules (the “Basel III Rules”) establishing more stringent regulatory capital requirements for U.S. banking institutions, which went into effect on January 1, 2015. A detailed discussion of the Basel III Rules is included in Part I, Item 1 of the under the heading “Supervision and Regulation.” ​ The Company and the Bank are subject to regulatory capital requirements administered by federal banking agencies. The capital ratios below are calculated pursuant to the capital requirements in effect for the periods reported below. ​ Capital levels and industry defined regulatory minimum required levels at December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Minimum Capital ​ Well Capitalized ​ ​ ​ ​ ​ ​ ​ ​ ​ Adequacy with Capital ​ Under Prompt Corrective ​ ​ ​ Actual ​ Conservation Buffer, if applicable 1 ​ Action Provisions 2 ​ ​ Amount Ratio Amount Ratio Amount Ratio ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 394,421 ​ 9.46 % ​ $ 291,855 ​ 7.00 % ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 514,992 ​ 12.41 ​ ​ ​ 290,487 ​ 7.00 ​ ​ $ 269,738 ​ 6.50 % Total capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 522,932 ​ 12.55 ​ ​ ​ 437,513 ​ 10.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 558,503 ​ 13.46 ​ ​ ​ 435,682 ​ 10.50 ​ ​ ​ 414,935 ​ 10.00 ​ Tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 419,421 ​ 10.06 ​ ​ ​ 354,382 ​ 8.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 514,992 ​ 12.41 ​ ​ ​ 352,734 ​ 8.50 ​ ​ ​ 331,985 ​ 8.00 ​ Tier 1 capital to average assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 419,421 ​ 7.81 ​ ​ ​ 214,812 ​ 4.00 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 514,992 ​ 9.58 ​ ​ ​ 215,028 ​ 4.00 ​ ​ ​ 268,785 ​ 5.00 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 277,199 ​ 11.94 % ​ $ 162,512 ​ 7.00 % ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 318,466 ​ 13.75 ​ ​ ​ 162,128 ​ 7.00 ​ ​ $ 150,548 ​ 6.50 % Total capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 331,178 ​ 14.26 ​ ​ ​ 243,855 ​ 10.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 347,408 ​ 15.00 ​ ​ ​ 243,186 ​ 10.50 ​ ​ ​ 231,605 ​ 10.00 ​ Tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 302,199 ​ 13.01 ​ ​ ​ 197,440 ​ 8.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 318,466 ​ 13.75 ​ ​ ​ 196,870 ​ 8.50 ​ ​ ​ 185,289 ​ 8.00 ​ Tier 1 capital to average assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 302,199 ​ 10.21 ​ ​ ​ 118,393 ​ 4.00 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 318,466 ​ 10.74 ​ ​ ​ 118,609 ​ 4.00 ​ ​ ​ 148,262 ​ 5.00 ​ ​ 1 Amounts are shown inclusive of a capital conservation buffer of 2.50%. 2 The prompt corrective action provisions are only applicable at the Bank level. The Bank exceeded the general minimum regulatory requirements to be considered “well capitalized.” ​ As part of its response to the impact of the COVID-19 pandemic, in the first quarter of 2020, U.S. federal regulatory authorities issued an interim final rule that provided banking organizations that adopted CECL during the 2020 calendar year with the option to delay for two years the estimated impact of CECL on regulatory capital relative to regulatory capital determined under the prior incurred loss methodology, followed by a three-year transition period to phase out the aggregate amount of the capital benefit provided during the initial two-year delay (i.e., a five-year transition in total). In connection with our adoption of CECL on January 1, 2020, we elected to utilize the five-year CECL transition. The cumulative amount that is not recognized in regulatory capital, in addition to the $3.8 million Day 1 impact of CECL adoption, will be phased in at 25% per year beginning January 1, 2022. As of December 31, 2021, the capital measures of the Company exclude $3.8 million, which is the Day 1 impact to retained earnings and 25% of the increase in the allowance for credit losses during 2020 and 2021, excluding PCD loans and acquisition related adjustments. ​ Dividend Restrictions ​ In addition to the above requirements, banking regulations and capital guidelines generally limit the amount of dividends that may be paid by a Bank without prior regulatory approval. Under these regulations, the amount of dividends that may be paid in any calendar year is limited to the current year’s profits, combined with the retained profit of the previous two years , subject to the capital requirements described above. As of December 31, 2021, the Company had total dividend availability of $9.5 million from the Bank, per regulatory guidelines. Pursuant to the Basel III rules that were fully phased-in at January 1, 2019, the Bank must keep a capital conservation buffer of 2.5% on all risk-based capital requirements in order to avoid additional limitations on capital distributions.

Mortgage Banking Derivatives

Mortgage Banking Derivatives	12 Months Ended
	Dec. 31, 2021
Mortgage Banking Derivatives.
Mortgage Banking Derivatives
Mortgage Banking Derivatives	Note 16: Mortgage Banking Derivatives ​ Commitments to fund certain mortgage loans (interest rate locks) to be sold into the secondary market and forward commitments for the future delivery of mortgage loans to third party investors are considered derivatives. It is the Company’s practice to sell mortgage-backed securities (“MBS”) contracts for the future delivery to economically hedge the effect of changes in interest rates resulting from its commitments to fund the loans. These contracts are also derivatives and collectively with the forward commitments for the future delivery of mortgage loans are considered forward contracts. These mortgage banking derivatives, which are not designated in hedge relationships using the accepted accounting for derivative instruments and hedging activities at December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 Forward contracts: ​ ​ ​ ​ ​ ​ ​ Notional amount ​ $ 20,000 ​ $ 46,500 ​ Fair value ​ 17 ​ (228) ​ ​ ​ ​ ​ ​ ​ ​ ​ Rate lock commitments: ​ ​ ​ ​ ​ ​ ​ Notional amount ​ $ 14,414 ​ $ 37,972 ​ Fair value ​ 491 ​ 1,068 ​ ​ Fair values were estimated based on changes in mortgage interest rates from the date of the commitments. The Company sold $239.2 million in loans to investors receiving proceeds of $254.4 million and resulting in a gain on sale of $9.3 million for the year ended December 31, 2021. Sales to investors included $187.5 million, or 76.5% to FNMA and $39.0 million, or 15.9%, to FHLMC for the year ended December 31, 2021. No other individual investor was sold more than 10% of the total loans sold.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2021
Fair Value Measurements
Fair Value Measurements	​ Note 17: Fair Value Measurements ​ Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The fair value hierarchy established by the Company also requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Three levels of inputs that may be used to measure fair value are: ​ Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the Company has the ability to access as of the measurement date. ​ Level 2: Significant observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, and other inputs that are observable or can be corroborated by observable market data. ​ Level 3: Significant unobservable inputs that reflect a company’s own view about the assumptions that market participants would use in pricing an asset or liability. ​ Transfers between levels are deemed to have occurred at the end of the reporting period. At December 31, 2021 and 2020, there were no transfers between levels. ​ The majority of securities are valued by external pricing services or dealer market participants and are classified in Level 2 of the fair value hierarchy. Both market and income valuation approaches are utilized. Quarterly, the Company evaluates the methodologies used by the external pricing services or dealer market participants to develop the fair values to determine whether the results of the valuations are representative of an exit price in the Company’s principal markets and an appropriate representation of fair value. The Company uses the following methods and significant assumptions to estimate fair value: ​ ● Government-sponsored agency debt securities are primarily priced using available market information through processes such as benchmark spreads, market valuations of like securities, like securities groupings and matrix pricing. ● Other government-sponsored agency securities, MBS and some of the actively traded real estate mortgage investment conduits and collateralized mortgage obligations are priced using available market information including benchmark yields, prepayment speeds, spreads, volatility of similar securities and trade date. ● State and political subdivisions are largely grouped by characteristics (e.g., geographical data and source of revenue in trade dissemination systems). Because some securities are not traded daily and due to other grouping limitations, active market quotes are often obtained using benchmarking for like securities. ● Auction rate asset backed securities are priced using market spreads, cash flows, prepayment speeds, and loss analytics. ● Annually every security holding is priced by a pricing service independent of the regular and recurring pricing services used. The independent service provides a measurement to indicate if the price assigned by the regular service is within or outside of a reasonable range. Management reviews this report and applies judgment in adjusting calculations at year end related to securities pricing. ● Residential mortgage loans available for sale in the secondary market are carried at fair market value. The fair value of loans held-for-sale is determined using quoted secondary market prices. ● Lending related commitments to fund certain residential mortgage loans, e.g. residential mortgage loans with locked interest rates to be sold in the secondary market and forward commitments for the future delivery of mortgage loans to third party investors as well as forward commitments for future delivery of MBS are considered derivatives. Fair values are estimated based on observable changes in mortgage interest rates including prices for MBS from the date of the commitment and do not typically involve significant judgments by management. ● The fair value of mortgage servicing rights is based on a valuation model that calculates the present value of estimated net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income to derive the resultant value. The Company is able to compare the valuation model inputs, such as the discount rate, prepayment speeds, weighted average delinquency and foreclosure/bankruptcy rates to widely available published industry data for reasonableness. ● Interest rate swap positions, both assets and liabilities, are based on valuation pricing models using an income approach reflecting readily observable market parameters such as interest rate yield curves. ● The fair value of impaired loans with specific allocations of the ACL is essentially based on recent real estate appraisals or the fair value of the collateralized asset. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are made in the appraisal process by the appraisers to reflect differences between the available comparable sales and income data. Such adjustments are usually significant and typically result in a Level 3 classification of the inputs for determining fair value. ● Nonrecurring adjustments to certain commercial and residential real estate properties classified as OREO are measured at the lower of carrying amount or fair value, less costs to sell. Fair values are based on third party appraisals of the property, resulting in a Level 3 classification. In cases where the carrying amount exceeds the fair value, less costs to sell, a valuation loss is recognized. ​ Assets and Liabilities Measured at Fair Value on a Recurring Basis ​ The tables below present the balance of assets and liabilities at December 31, measured by the Company at fair value on a recurring basis are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ Level 1 Level 2 Level 3 Total Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 202,339 ​ $ - ​ $ - ​ $ 202,339 U.S. government agencies ​ ​ - ​ ​ 61,888 ​ ​ - ​ ​ 61,888 U.S. government agencies mortgage-backed ​ ​ - ​ ​ 172,302 ​ ​ - ​ ​ 172,302 States and political subdivisions ​ ​ - ​ ​ 242,373 ​ ​ 14,092 ​ ​ 256,465 Corporate bonds ​ ​ - ​ ​ 9,887 ​ ​ - ​ ​ 9,887 Collateralized mortgage obligations ​ ​ - ​ ​ 672,967 ​ ​ - ​ ​ 672,967 Asset-backed securities ​ ​ - ​ ​ 236,877 ​ ​ - ​ ​ 236,877 Collateralized loan obligations ​ ​ - ​ ​ 79,763 ​ ​ - ​ ​ 79,763 Loans held-for-sale ​ ​ - ​ ​ 4,737 ​ ​ - ​ ​ 4,737 Mortgage servicing rights ​ ​ - ​ ​ - ​ ​ 7,097 ​ ​ 7,097 Interest rate swap agreements ​ ​ - ​ ​ 3,494 ​ ​ - ​ ​ 3,494 Mortgage banking derivatives ​ ​ - ​ ​ 508 ​ ​ - ​ ​ 508 Total ​ $ 202,339 ​ $ 1,484,796 ​ $ 21,189 ​ $ 1,708,324 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements, including risk participation agreements ​ $ - ​ $ 6,809 ​ $ - ​ $ 6,809 Total ​ $ - ​ $ 6,809 ​ $ - ​ $ 6,809 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ Level 1 Level 2 Level 3 Total Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 4,117 ​ $ - ​ $ - ​ $ 4,117 U.S. government agencies ​ ​ - ​ ​ 6,657 ​ ​ - ​ ​ 6,657 U.S. government agencies mortgage-backed ​ ​ - ​ ​ 17,209 ​ ​ - ​ ​ 17,209 States and political subdivisions ​ ​ - ​ ​ 244,940 ​ ​ 4,319 ​ ​ 249,259 Collateralized mortgage obligations ​ ​ - ​ ​ 56,585 ​ ​ - ​ ​ 56,585 Asset-backed securities ​ ​ - ​ ​ 131,818 ​ ​ - ​ ​ 131,818 Collateralized loan obligations ​ ​ - ​ ​ 30,533 ​ ​ - ​ ​ 30,533 Loans held-for-sale ​ ​ - ​ ​ 12,611 ​ ​ - ​ ​ 12,611 Mortgage servicing rights ​ ​ - ​ ​ - ​ ​ 4,224 ​ ​ 4,224 Interest rate swap agreements ​ ​ - ​ ​ 9,388 ​ ​ - ​ ​ 9,388 Mortgage banking derivatives ​ ​ - ​ ​ 840 ​ ​ - ​ ​ 840 Total ​ $ 4,117 ​ $ 510,581 ​ $ 8,543 ​ $ 523,241 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements, including risk participation agreements ​ $ - ​ $ 13,159 ​ $ - ​ $ 13,159 Total ​ $ - ​ $ 13,159 ​ $ - ​ $ 13,159 ​ The changes in Level 3 assets and liabilities measured at fair value on a recurring basis are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2021 ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ States and ​ Mortgage ​ ​ Political ​ Servicing ​ Subdivisions Rights Beginning balance January 1, 2021 ​ $ 4,319 ​ $ 4,224 Total gains or losses ​ ​ ​ ​ ​ ​ Included in earnings ​ ​ (20) ​ ​ 2,420 Included in other comprehensive income ​ ​ 801 ​ ​ - Purchases, issuances, sales, and settlements ​ ​ ​ ​ ​ ​ Purchases ​ ​ 9,919 ​ ​ - Issuances ​ ​ - ​ ​ 1,612 Settlements ​ ​ (927) ​ ​ (1,159) Ending balance December 31, 2021 ​ $ 14,092 ​ $ 7,097 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2020 ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ States and ​ Mortgage ​ ​ Political ​ Servicing ​ Subdivisions Rights Beginning balance January 1, 2020 ​ $ 5,419 ​ $ 5,935 Total gains or losses ​ ​ ​ ​ ​ ​ Included in earnings ​ ​ (20) ​ ​ (2,483) Included in other comprehensive income ​ ​ (628) ​ ​ - Purchases, issuances, sales, and settlements ​ ​ ​ ​ ​ ​ Purchases ​ ​ 13,086 ​ ​ - Issuances ​ ​ - ​ ​ 2,288 Settlements ​ ​ (13,538) ​ ​ (1,516) Ending balance December 31, 2020 ​ $ 4,319 ​ $ 4,224 ​ ​ ​ ​ ​ ​ ​ ​ The following table and commentary presents quantitative and qualitative information about Level 3 fair value measurements as of December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted Measured at fair value ​ ​ ​ ​ ​ ​ Significant Unobservable ​ ​ ​ Average on a recurring basis: Fair Value Valuation Methodology Inputs Range of Input of Inputs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage servicing rights ​ $ 7,097 ​ Discounted Cash Flow ​ Discount Rate ​ 11.0 - 15.0% ​ 11.0 % ​ ​ ​ ​ ​ ​ ​ Prepayment Speed ​ 0.0 - 36.6% ​ 11.9 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table and commentary presents quantitative and qualitative information about Level 3 fair value measurements as of December 31, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted Measured at fair value ​ ​ ​ ​ ​ ​ Significant Unobservable ​ ​ ​ Average on a recurring basis: Fair Value Valuation Methodology Inputs Range of Input of Inputs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage servicing rights ​ $ 4,224 ​ Discounted Cash Flow ​ Discount Rate ​ 11.0 - 15.0% ​ 11.0 % ​ ​ ​ ​ ​ ​ ​ Prepayment Speed ​ 5.5 - 59.1% ​ 19.5 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ In addition to the above, Level 3 fair value measurement included $14.1 million for state and political subdivisions representing various local municipality securities at December 31, 2021. Level 3 fair value measurement included $4.3 million on the state and political subdivisions line at December 31, 2020. Given the small dollar amount and size of the municipality issuances involved, this is categorized as Level 3 based on the payment stream received by the Company from the municipalities. That payment stream is otherwise an unobservable input. ​ Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis: ​ The Company may be required, from time to time, to measure certain other assets at fair value on a nonrecurring basis in accordance with GAAP. These assets consist of impaired loans and OREO. For assets measured at fair value on a nonrecurring basis at December 31, 2021 the following tables provide the level of valuation assumptions used to determine each valuation and the carrying value of the related assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ Level 1 Level 2 Level 3 Total Individually evaluated loans 1 ​ $ - ​ $ - ​ $ 13,138 ​ $ 13,138 Other real estate owned, net 2 ​ ​ - ​ ​ - ​ ​ 2,356 ​ ​ 2,356 Total ​ $ - ​ $ - ​ $ 15,494 ​ $ 15,494 ​ 1 Represents carrying value and related write-downs of loans for which adjustments are substantially based on the appraised value of collateral for collateral-dependent loans, had a carrying amount of $ 18.5 million and a valuation allowance of $5.4 million, resulting in an increase of specific allocations within the provision for credit losses of $ 2.7 for the year ending December 31, 2021. ​ 2 OREO is measured at the lower of carrying or fair value less costs to sell, and had a net carrying amount of $2.4 million, which is made up of the outstanding balance of $ 3.7 million, net of a valuation allowance of $ 1.2 million and purchase accounting adjustments of $131,000 at December 31, 2021. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ Level 1 Level 2 Level 3 Total Individually evaluated loans 1 ​ $ - ​ $ - ​ $ 9,675 ​ $ 9,675 Other real estate owned, net 2 ​ ​ - ​ ​ - ​ ​ 2,474 ​ ​ 2,474 Total ​ $ - ​ $ - ​ $ 12,149 ​ $ 12,149 ​ 1 Represents carrying value and related write-downs of loans for which adjustments are substantially based on the appraised value of collateral for collateral-dependent loans, had a carrying amount of $12.3 million and a valuation allowance of $2.6 million, resulting in an increase of specific allocations within the provision for loan and lease losses of $1.4 million for the year ending December 31, 2020. ​ 2 OREO is measured at the lower of carrying or fair value less costs to sell, and had a net carrying amount of $ 2.5 million, which is made up of the outstanding balance of $ 4.1 million, net of a valuation allowance of $ 1.6 million, at December 31, 2020. ​ The Company also has assets that under certain conditions are subject to measurement at fair value on a nonrecurring basis. These assets include OREO and impaired loans. The Company has estimated the fair values of these assets based primarily on Level 3 inputs. OREO and impaired loans are generally valued using the fair value of collateral provided by third party appraisals. These valuations include assumptions related to cash flow projections, discount rates, and recent comparable sales. The numerical range of unobservable inputs for these valuation assumptions are not meaningful.

Fair Values of Financial Instru

Fair Values of Financial Instruments	12 Months Ended
	Dec. 31, 2021
Fair Values of Financial Instruments
Fair Values of Financial Instruments	Note 18: Fair Value of Financial Instruments ​ The estimated fair values approximate carrying amount for all items except those described in the following table. Securities available-for-sale fair values are based upon market prices or dealer quotes, and if no such information is available, on the rate and term of the security. The carrying value of FHLBC stock approximates fair value as the stock is nonmarketable and can only be sold to the FHLBC or another member institution at par. FHLBC stock is carried at cost and considered a Level 2 fair value. For December 31, 2021 and 2020, the fair values of loans and leases are estimated on an exit price basis incorporating discounts for credit, liquidity and marketability factors. The fair value of time deposits is estimated using discounted future cash flows at current rates offered for deposits of similar remaining maturities. The fair values of borrowings were estimated based on interest rates available to the Company for debt with similar terms and remaining maturities. The fair value of off balance sheet volume is not considered material. The fair value of mortgage banking derivatives is discussed in Note 16: Mortgage Banking Derivatives, above. ​ The carrying amount and estimated fair values of financial instruments at December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ ​ Carrying ​ Fair ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amount Value Level 1 Level 2 Level 3 Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and due from banks ​ $ 38,565 ​ $ 38,565 ​ $ 38,565 ​ $ - ​ $ - Interest earning deposits with financial institutions ​ ​ 713,542 ​ ​ 713,542 ​ ​ 713,542 ​ ​ - ​ ​ - Securities available-for-sale ​ ​ 1,692,488 ​ ​ 1,692,488 ​ ​ 202,339 ​ ​ 1,476,057 ​ ​ 14,092 FHLBC and FRBC stock ​ ​ 13,257 ​ ​ 13,257 ​ ​ - ​ ​ 13,257 ​ ​ - Loans held-for-sale ​ ​ 4,737 ​ ​ 4,737 ​ ​ - ​ ​ 4,737 ​ ​ - Net loans ​ ​ 3,377,667 ​ ​ 3,408,199 ​ ​ - ​ ​ - ​ ​ 3,408,199 Mortgage servicing rights ​ ​ 7,097 ​ ​ 7,097 ​ ​ - ​ ​ - ​ ​ 7,097 Interest rate swap agreements ​ ​ 3,494 ​ ​ 3,494 ​ ​ - ​ ​ 3,494 ​ ​ - Interest rate lock commitments and forward contracts ​ ​ 508 ​ ​ 508 ​ ​ - ​ ​ 508 ​ ​ - Interest receivable on securities and loans ​ ​ 13,431 ​ ​ 13,431 ​ ​ - ​ ​ 13,431 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Noninterest bearing deposits ​ $ 1,428,055 ​ $ 1,428,055 ​ $ 1,428,055 ​ $ - ​ $ - Interest bearing deposits ​ ​ 4,038,177 ​ ​ 4,041,369 ​ ​ - ​ ​ 4,041,369 ​ ​ - Securities sold under repurchase agreements ​ ​ 50,377 ​ ​ 50,377 ​ ​ - ​ ​ 50,377 ​ ​ - Junior subordinated debentures ​ ​ 25,773 ​ ​ 18,557 ​ ​ - ​ ​ 18,557 ​ ​ - Subordinated debentures ​ ​ 59,212 ​ ​ 60,111 ​ ​ ​ ​ ​ 60,111 ​ ​ ​ Senior notes ​ ​ 44,480 ​ ​ 44,480 ​ ​ 44,480 ​ ​ - ​ ​ - Note payable and other borrowings ​ ​ 19,074 ​ ​ 19,411 ​ ​ - ​ ​ 19,411 ​ ​ - Interest rate swap agreements ​ ​ 6,788 ​ ​ 6,788 ​ ​ - ​ ​ 6,788 ​ ​ - Interest payable on deposits and borrowings ​ ​ 1,706 ​ ​ 1,706 ​ ​ - ​ ​ 1,706 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Carrying ​ Fair ​ ​ ​ ​ ​ ​ ​ Amount Value Level 1 Level 2 Level 3 Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and due from banks ​ $ 24,306 ​ $ 24,306 ​ $ 24,306 ​ $ - ​ $ - Interest earning deposits with financial institutions ​ ​ 305,597 ​ ​ 305,597 ​ ​ 305,597 ​ ​ - ​ ​ - Securities available-for-sale ​ ​ 496,178 ​ ​ 496,178 ​ ​ 4,117 ​ ​ 487,742 ​ ​ 4,319 FHLBC and FRBC stock ​ ​ 9,917 ​ ​ 9,917 ​ ​ - ​ ​ 9,917 ​ ​ - Loans held-for-sale ​ ​ 12,611 ​ ​ 12,611 ​ ​ - ​ ​ 12,611 ​ ​ - Net loans ​ ​ 2,000,996 ​ ​ 2,009,773 ​ ​ - ​ ​ - ​ ​ 2,009,773 Mortgage servicing rights ​ ​ 4,224 ​ ​ 4,224 ​ ​ - ​ ​ - ​ ​ 4,224 Interest rate swap agreements ​ ​ 9,388 ​ ​ 9,388 ​ ​ - ​ ​ 9,388 ​ ​ - Interest rate lock commitments and forward contracts ​ ​ 840 ​ ​ 840 ​ ​ - ​ ​ 840 ​ ​ - Interest receivable on securities and loans ​ ​ 9,698 ​ ​ 9,698 ​ ​ - ​ ​ 9,698 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Noninterest bearing deposits ​ $ 909,505 ​ $ 909,505 ​ $ 909,505 ​ $ - ​ $ - Interest bearing deposits ​ ​ 1,627,568 ​ ​ 1,630,109 ​ ​ - ​ ​ 1,630,109 ​ ​ - Securities sold under repurchase agreements ​ ​ 66,980 ​ ​ 66,980 ​ ​ - ​ ​ 66,980 ​ ​ - Junior subordinated debentures ​ ​ 25,773 ​ ​ 14,658 ​ ​ - ​ ​ 14,658 ​ ​ - Senior notes ​ ​ 44,375 ​ ​ 44,600 ​ ​ 44,600 ​ ​ - ​ ​ - Note payable and other borrowings ​ ​ 23,393 ​ ​ 24,043 ​ ​ - ​ ​ 24,043 ​ ​ - Interest rate swap agreements ​ ​ 13,071 ​ ​ 13,071 ​ ​ - ​ ​ 13,071 ​ ​ - Interest payable on deposits and borrowings ​ ​ 418 ​ ​ 418 ​ ​ - ​ ​ 418 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Financial Instruments with Off-

Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions	12 Months Ended
	Dec. 31, 2021
Derivative Excluding Mortgage Banking Derivatives
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions	Note 19: Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions ​ Risk Management Objective of Using Derivatives ​ The Company is exposed to certain risk arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of its assets and liabilities and the use of derivative financial instruments. Specifically, the Company enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company’s derivative financial instruments are used to manage differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to the Company’s loan portfolio. ​ Cash Flow Hedges of Interest Rate Risk ​ The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow 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 exchange of the underlying notional amount. Prior to 2019, such derivatives were used to hedge the variable cash flows associated with existing variable-rate borrowings. In December of 2019, the Company also executed a loan pool hedge of $50 million to convert variable rate loans to a fixed rate index for a five year term. ​ For derivatives designated and that qualify as cash flow hedges of interest rate risk, the gain or loss on the derivative is recorded in Accumulated Other Comprehensive Income and subsequently reclassified into interest income or interest expense in the same period(s) during which the hedged transaction affects earnings. Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest income or expense as interest payments are received on the variable rate loan pool or the Company’s variable-rate borrowings. During the next twelve months, the Company estimates that an additional $190,000 will be reclassified as an increase to interest income and an additional $174,000 will be reclassified as an increase to interest expense. ​ Non-designated Hedges ​ Derivatives not designated as hedges are not speculative and result from a service the Company provides to certain customers. The Company executes interest rate swaps with commercial banking customers to facilitate their respective risk management strategies. Those interest rate swaps are simultaneously hedged by offsetting derivatives 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 derivatives associated with this program do not meet the strict hedge accounting requirements, changes in the fair value of both the customer derivatives and the offsetting derivatives are recognized directly in earnings. ​ The Company also grants mortgage loan interest rate lock commitments to borrowers, subject to normal loan underwriting standards. The interest rate risk associated with these loan interest rate lock commitments is managed with contracts for future deliveries of loans as well as selling forward mortgage-backed securities contracts. Loan interest rate lock commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Commitments to originate residential mortgage loans held-for-sale and forward commitments to sell residential mortgage loans or forward MBS contracts are considered derivative instruments and changes in the fair value are recorded to mortgage banking revenue. Fair values are estimated based on observable changes in mortgage interest rates including mortgage-backed securities prices from the date of the commitment. ​ Disclosure of Fair Values of Derivative Instruments on the Balance Sheet ​ The Company entered into a forward starting interest rate swap on August 18, 2015, with an effective date of June 15, 2017. This transaction had a notional amount totaling $25.8 million as of December 31, 2021 and 2020, was designated as a cash flow hedge of certain junior subordinated debentures and was determined to be fully effective during the period presented. As such, no amount of ineffectiveness has been included in net income. Therefore, the aggregate fair value of the swap is recorded in other liabilities with changes in fair value recorded in other comprehensive income, net of tax. The amount included in other comprehensive income would be reclassified to current earnings should all or a portion of the hedge no longer be considered effective. We expect the hedge to remain fully effective during the remaining term of the swap. The Bank pays the counterparty a fixed rate and receives a floating rate based on three month LIBOR. The trust preferred securities ​ In December of 2019, the Company also executed a loan pool hedge of $50.0 million to convert variable rate loans to a fixed rate index for a five year term. This transaction falls under hedge accounting standards and is paired against a pool the Bank’s Libor-based loans. Overall, the new swap only bolsters income in down rate scenarios by a modest degree. We consider the current level of interest rate risk to be moderate but intend to continue looking for market opportunities for further hedging opportunities. ​ The Bank also has interest rate derivative positions to assist with risk management that are not designated as hedging instruments. These derivative positions relate to transactions in which the Bank enters an interest rate swap with a client while at the same time entering into an offsetting interest rate swap with another financial institution. The Bank had $17.2 million of cash collateral pledged with one correspondent financial institution and held $180,000 of cash pledged from another correspondent bank to support interest rate swap activity at December 31, 2021, and no investment securities were required to be pledged to any correspondent financial institutions. The Bank had $17.2 million of cash collateral pledged with one correspondent financial institution and held $1.4 million of cash pledged from another correspondent bank to support interest rate swap activity at December 31, 2020, and no investment securities were required to be pledged to any correspondent financial institutions. At December 31, 2021, the notional amount of non-hedging interest rate swaps was $165.0 million with a weighted average maturity of 3.9 years. At December 31, 2020, the notional amount of non-hedging interest rate swaps was $ 189.1 million with a weighted average maturity of 4.7 years. The Bank offsets derivative assets and liabilities that are subject to a master netting arrangement. ​ ​ The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Balance Sheets as of December 31, were as follows: ​ Fair Value of Derivative Instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ No. of Trans. ​ Notional Amount $ ​ Balance Sheet Location Fair Value $ ​ Balance Sheet Location Fair Value $ Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements 2 ​ 75,774 ​ Other Assets 808 ​ Other Liabilities 4,102 Total derivatives designated as hedging instruments ​ ​ ​ ​ ​ 808 ​ ​ 4,102 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps with commercial loan customers 26 ​ 165,005 ​ Other Assets 2,686 ​ Other Liabilities 2,686 Interest rate lock commitments and forward contracts 87 ​ 34,414 ​ Other Assets 508 ​ Other Liabilities - Other contracts 3 ​ 17,173 ​ Other Assets - ​ Other Liabilities 21 Total derivatives not designated as hedging instruments ​ ​ ​ ​ ​ 3,194 ​ ​ 2,707 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ No. of Trans. ​ Notional Amount $ ​ Balance Sheet Location Fair Value $ ​ Balance Sheet Location Fair Value $ Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements 2 ​ 75,774 ​ Other Assets 2,697 ​ Other Liabilities 6,380 Total derivatives designated as hedging instruments ​ ​ ​ ​ ​ 2,697 ​ ​ 6,380 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps with commercial loan customers 28 ​ 189,126 ​ Other Assets 6,691 ​ Other Liabilities 6,691 Interest rate lock commitments and forward contracts 205 ​ 84,472 ​ Other Assets 840 ​ Other Liabilities - Other contracts 4 ​ 26,523 ​ Other Assets - ​ Other Liabilities 88 Total derivatives not designated as hedging instruments ​ ​ ​ ​ ​ 7,531 ​ ​ 6,779 ​ Disclosure of the Effect of Fair Value and Cash Flow Hedge Accounting ​ The fair value and cash flow hedge accounting related to derivatives covered under ASC Subtopic 815-20 impacted Accumulated Other Comprehensive Income (“AOCI”) and the Income Statement. The loss recognized in AOCI on derivatives totaled $2.4 million as of December 31, 2021, and $2.7 million as of December 31, 2020. The amount of the loss reclassified from AOCI to interest income or interest expense on the income statement totaled $56,000 and $57,000 for the years ended December 31, 2021, and December 31, 2020, respectively. ​ Credit-risk-related Contingent Features ​ For derivative transactions involving counterparties who are lending customers of the Company, the derivative credit exposure is managed through the normal credit review and monitoring process, which may include collateralization, financial covenants and/or financial guarantees of affiliated parties. Agreements with such customers require that losses associated with derivative transactions receive payment priority from any funds recovered should a customer default and ultimate disposition of collateral or guarantees occur. ​ Credit exposure to broker/dealer counterparties is managed through agreements with each derivative counterparty that require collateralization of fair value gains owed by such counterparties. Some small degree of credit exposure exists due to timing differences between when a gain may occur and the subsequent point in time that collateral is delivered to secure that gain. This is monitored by the Company and procedures are in place to minimize this exposure. Such agreements also require the Company to collateralize counterparties in circumstances wherein the fair value of the derivatives result in loss to the Company. ​ Other provisions of such agreements define certain events that may lead to the declaration of default and/or the early termination of the derivative transaction(s), including the following: ● if the Company either defaults or is capable of being declared in default on any of its indebtedness (exclusive of deposit obligations); ● if a merger occurs that materially changes the Company's creditworthiness in an adverse manner; or ● if certain specified adverse regulatory actions occur, such as the issuance of a Cease and Desist Order, or citations for actions considered Unsafe and Unsound or that may lead to the termination of deposit insurance coverage by the Federal Deposit Insurance Corporation.

Preferred Stock

Preferred Stock	12 Months Ended
	Dec. 31, 2021
Preferred Stock.
Preferred Stock	​ Note 20: Preferred Stock ​ Preferred stock of 300,000 shares is authorized but unissued as of December 31, 2021 and 2020. ​ ​

Parent Company Condensed Financ

Parent Company Condensed Financial Information	12 Months Ended
	Dec. 31, 2021
Parent Company Condensed Financial Information
Parent Company Condensed Financial Information	Note 21: Parent Company Condensed Financial Information ​ Condensed Balance Sheets for the years ended December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 Assets ​ ​ ​ ​ ​ ​ ​ Noninterest bearing deposit with bank subsidiary ​ $ 25,112 ​ $ 47,601 ​ Investment in subsidiaries ​ 626,325 ​ 353,722 ​ Other assets ​ 1,111 ​ 3,270 ​ Total assets ​ $ 652,548 ​ $ 404,593 ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities and Stockholders’ Equity ​ ​ ​ ​ ​ ​ ​ Junior subordinated debentures ​ $ 25,773 ​ $ 25,773 ​ Subordinated debt ​ 59,212 ​ - ​ Senior notes ​ ​ 44,480 ​ ​ 44,375 ​ Notes payable ​ ​ 13,000 ​ ​ 17,000 ​ Other liabilities ​ 8,056 ​ 10,358 ​ Stockholders’ equity ​ 502,027 ​ 307,087 ​ Total liabilities and stockholders' equity ​ $ 652,548 ​ $ 404,593 ​ ​ Condensed Statements of Income for the years ended December 31 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 Operating Income ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash dividends received from subsidiaries ​ $ 40,000 ​ $ 41,300 ​ $ 20,000 Other income ​ 15 ​ 32 ​ 109 Total operating income ​ 40,015 ​ 41,332 ​ 20,109 Operating Expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ Junior subordinated debentures ​ 1,133 ​ 2,216 ​ 3,724 Subordinated debt ​ ​ 1,610 ​ ​ - ​ ​ - Senior notes ​ ​ 2,692 ​ ​ 2,693 ​ ​ 2,700 Notes payable ​ 291 ​ 362 ​ - Other interest expense ​ - ​ - ​ 13 Other expenses ​ 6,918 ​ 3,669 ​ 4,025 Total operating expense ​ 12,644 ​ 8,940 ​ 10,462 Income before income taxes and equity in undistributed net income of subsidiaries ​ 27,371 ​ 32,392 ​ 9,647 Income tax benefit ​ (2,986) ​ (2,215) ​ (3,187) Income before equity in undistributed net income of subsidiaries ​ 30,357 ​ 34,607 ​ 12,834 Equity in undistributed net income of subsidiaries ​ (10,313) ​ (6,782) ​ 26,621 Net income available to common stockholders ​ $ 20,044 ​ $ 27,825 ​ $ 39,455 ​ ​ Condensed Statements of Cash Flows for the years ended December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 Cash Flows from Operating Activities ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Income ​ $ 20,044 ​ $ 27,825 ​ $ 39,455 Adjustments to reconcile net income to net cash from operating activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Equity in undistributed net income of subsidiaries ​ 10,313 ​ 6,782 ​ (26,621) Provision for deferred tax expense (benefit) ​ (248) ​ (514) ​ 4,186 Change in taxes payable ​ (695) ​ 5,933 ​ 3,896 Change in other assets ​ (12) ​ 954 ​ - Stock-based compensation ​ 1,435 ​ 2,089 ​ 2,516 Other, net ​ 961 ​ 682 ​ (80) Net cash provided by (used in) operating activities ​ 31,798 ​ 43,751 ​ 23,352 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash Flows from Investing Activities ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash paid for acquisition, net of cash and cash equivalents retained ​ (94,406) ​ - ​ - Net cash used in investing activities ​ (94,406) ​ - ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash Flows from Financing Activities ​ ​ ​ ​ ​ ​ ​ ​ ​ Net change in other short-term borrowings ​ ​ - ​ ​ - ​ ​ (4,000) Dividend paid on common stock ​ ​ (4,612) ​ ​ (1,186) ​ ​ (1,195) Purchases of treasury stock ​ (10,417) ​ (5,922) ​ (666) Redemption of junior subordinated debentures ​ ​ - ​ ​ (32,604) ​ ​ - Issuance of term note ​ ​ - ​ ​ 20,000 ​ ​ - Issuance of sub debt ​ ​ 59,148 ​ ​ - ​ ​ - Repayment of term note ​ ​ (4,000) ​ ​ (3,000) ​ ​ - Proceeds from exercise of stock option ​ ​ - ​ ​ - ​ ​ 32 Net cash (used in) provided by financing activities ​ 40,119 ​ (22,712) ​ (5,829) Net change in cash and cash equivalents ​ (22,489) ​ 21,039 ​ 17,523 Cash and cash equivalents at beginning of year ​ 47,601 ​ 26,562 ​ 9,039 Cash and cash equivalents at end of year ​ $ 25,112 ​ $ 47,601 ​ $ 26,562 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2021
Employee Benefit Plans
Employee Benefit Plans	Note 22: Employee Benefit Plans ​ Old Second Bancorp, Inc. Employees 401(k) Savings Plan and Trust The Company sponsors a qualified, tax-exempt defined contribution plan (the “401(k) Plan”) qualifying under section 401(k) of the Internal Revenue Code. Virtually all employees are eligible to participate after meeting certain age and service requirements; these service requirements were shortened in 2020 from eligibility the first day of a quarter after 90 days of service to the first day of a month after 30 days of service. Eligible employees are permitted to contribute up to a dollar limit set by law of their compensation to the 401(k) Plan. For the years ended December 31, 2021, 2020 and 2019, a discretionary match equal to 100% of the first 3% and 50% of the next 2% was made to participants of the 401(k) Plan. Participants are 100% vested in the discretionary matching contributions. Participants can choose between several different investment options under the 401(k) Plan, including shares of the Company’s common stock. An additional component of the 401(k) Plan arrangement allows the Company to make annual discretionary profit sharing contributions based on the Company’s profitability in a given year, and on each participant’s annual compensation. The Company elected not to make a discretionary profit sharing contribution for the years end December 31, 2021, 2020 and 2019. ​ The total expense relating to the 401(k) Plan was approximately $1.4 million in 2021, $1.2 million in 2020 and $1.1 million in 2019. ​ Old Second Bancorp, Inc. Voluntary Deferred Compensation Plan for Executives and Directors ​ The Company sponsors a deferred compensation plan, which is a means by which certain executives and directors may voluntarily defer a portion of their salary, bonus and directors fees, as applicable. This plan is an unfunded, nonqualified deferred compensation arrangement. Company obligations under this arrangement as of December 31, 2021, 2020 and 2019 are included in other liabilities.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
Summary of Significant Accounting Policies
Nature of Operations	Nature of Operations ​ The consolidated financial statements of the Company include the financial statements of the Bank and its wholly-owned subsidiaries, River Street Advisors, LLC, an investment advisory/management service company, Old Second Affordable Housing Fund, L.L.C., which provides down payment assistance for home ownership to qualified individuals, and Melrose Holdings LLC and Station I, LLC, both of which hold property acquired by the Bank through foreclosure or in the ordinary course of collecting a debt previously contracted with borrowers. The Company uses the accrual basis of accounting for financial reporting purposes. Certain amounts in prior year financial statements have been reclassified to conform to the 2021 presentation.
Use of Estimates	Use of Estimates
Principles of Consolidation	Principles of Consolidation –
Segment Reporting	Segment Reporting
Concentration of Credit Risk	Concentration of Credit Risk
Cash and Cash Equivalents	Cash and Cash Equivalents – For purposes of the Consolidated Statements of Cash Flows, management has defined cash and cash equivalents to include cash and due from banks, interest-earning deposits in other financial institutions, and other short-term investments, such as federal funds sold and securities purchased under agreements to resell. The classification of cash and cash equivalents includes those assets held in the form of cash or liquid instruments with an original maturity of 90 days or less.
Securities	Securities ​ Realized securities gains or losses, which are reported in securities gains (losses), net, in the Consolidated Statements of Income, are recognized on a trade date basis and are determined using the specific identification method. Discounts are accreted into interest income over the estimated life of the related security and premiums are amortized into income to the earlier of the call date or estimated life of the related security using the level yield method. ​ The Company has made a policy election to exclude accrued interest income from the amortized cost basis of available-for-sale debt securities and report accrued interest separately in other assets in the Consolidated Balance Sheets. A debt security is placed on nonaccrual status at the time we no longer expect to receive all contractual amounts due, which is generally at 90 days past due. Accrued interest for a security placed on nonaccrual is reversed against interest income. Accordingly, we do not recognize an allowance for credit loss against accrued interest receivable. ​ For available-for-sale debt securities in an unrealized loss position, we first assess whether we intend to sell, or it is more likely than not that we will be required to sell the security, prior to the recovery of its amortized cost basis. If either of the above criteria is met, the security’s amortized cost basis is written down to fair value through earnings. When the criteria above is not met, we evaluate whether the decline in fair value is the result of credit losses or other factors. In making this assessment, we review changes to the rating of the security by a rating agency, an increase in defaults on the underlying collateral, and the extent to which the securities are issued by the federal government or its agencies, including the amount of the guarantee issued by those agencies, among other factors. If this assessment indicates that a credit loss exists, we compare the present value of cash flows expected to be collected from the security with the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis for the security, a credit loss exists and an allowance for credit losses is recorded through earnings, limited to the amount that the fair value of the security is less than its amortized cost basis. Any impairment that has not been recorded through an allowance for credit losses is recognized in other comprehensive income (loss), net of taxes. ​ Changes in the allowance for credit losses are recorded as a provision for (or reversal of) credit loss expense. Losses are charged against the allowance when management believes the uncollectibility of an available for sale debt security is confirmed or when either of the criteria regarding intent or requirement to sell is met.
Federal Home Loan Bank and Federal Reserve Bank Stock	Federal Home Loan Bank and Federal Reserve Bank Stock
Loans Held-for-Sale	Loans Held-for-Sale
Loans	Loans ​ Interest income on loans is accrued based on principal amounts outstanding. Loan and lease origination fees, commitment fees, and certain direct loan origination costs are deferred and amortized over the life of the related loans or commitments as a yield adjustment. Fees related to standby letters of credit, whose ultimate exercise is remote, are amortized into fee income over the estimated life of the commitment. Other related fees are recognized as fee income when earned. ​ Past Due and Nonaccrual Loans ​ Loans are considered past due or delinquent when the contractual principal or interest due in accordance with the terms of the loan agreement or any portion thereof remains unpaid after the due date of the scheduled payment. Generally, loans are placed on nonaccrual status (i) when either principal or interest payments become 90 days or more past due based on contractual terms unless the loan is sufficiently collateralized such that full repayment of both principal and interest is expected and is in the process of collection within a reasonable period or (ii) when an individual analysis of a borrower’s creditworthiness indicates a credit should be placed on nonaccrual status whether or not the loan is 90 days or more past due. When a loan is placed on nonaccrual status, unpaid interest credited to income is reversed. Interest received on such loans is accounted for on the cash-basis or cost recovery method, until qualifying for return to accrual. Under the cost-recovery method, interest income is not recognized until the loan balance is reduced to zero. Under the cash basis method, interest income is recorded when the payment is received in cash. Nonaccrual loans are returned to accrual status when the financial position of the borrower and other relevant factors indicate there is no longer doubt that the Company will collect all principal and interest due. ​ Troubled Debt Restructurings (“TDRs”) ​ A restructuring of debt is considered a TDR when (i) the borrower is experiencing financial difficulties and (ii) the creditor grants a concession, such as forgiveness of principal, reduction of the interest rate, changes in payments, or extension of the maturity, that it would not otherwise consider. Loans are not classified as TDRs when the modification is short-term or results in only an insignificant delay or shortfall in the payments to be received. The Company’s TDRs are determined on a case-by-case basis in connection with ongoing loan collection processes. ​ The Company does not accrue interest on any TDRs unless it believes collection of all principal and interest under the modified terms is reasonably assured. For TDRs to accrue interest, the borrower must demonstrate both some level of past performance and the capacity to perform under the modified terms. Generally, six months of consecutive payment performance by the borrower under the restructured terms is required before TDRs are returned to accrual status. However, the period could vary depending on the individual facts and circumstances of the loan. An evaluation of the borrower’s current creditworthiness is used to assess whether the borrower has the capacity to repay the loan under the modified terms. This evaluation includes an estimate of expected cash flows, evidence of strong financial position, and estimates of the value of collateral, if applicable. ​ Purchase Credit Deteriorated (PCD) Loans ​ Purchased credit deteriorated loans (“PCD loans”) are purchased loans, that, as of the date of acquisition, have experienced a more-than-insignificant deterioration in credit quality since origination, as determined by the Company’s assessment. An allowance for credit losses is determined using the same methodology as other loans held for investment. The initial allowance for credit losses determined on an individual loan basis from an evaluation of each specific loan and its related credit metrics. The sum of the loan’s purchase price and initial allowance for credit losses becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is accreted or amortized into interest income over the life of the loan. Expected cash flows in excess of the amount paid are recorded as interest income over the remaining life of the loans (accretable yield). The excess of the loan’s contractual principal and interest over expected cash flows is not recorded (nonaccretable difference). ​ Subsequent changes to the allowance for credit losses are recorded through provision for credit losses. Over the life of the loan, expected cash flows continue to be estimated. If the present value of expected cash flows is less than the carrying amount, a loss is recorded as a provision for credit losses. If the present value of expected cash flows is greater than the carrying value, it is recognized as part of future interest income. ​ Non-Purchase Credit Deteriorated (Non-PCD) Loans ​ Non-purchased credit deteriorated loans (“non-PCD loans”) are purchased loans, that, as of the date of acquisition, have not experienced a significant deterioration in credit quality since origination, as determined by the Company’s assessment. An allowance for credit losses is determined using the same methodology as other loans held for investment, and no allowance is established as a Day One fair valuation allowance. The sum of the loan’s purchase price becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a discount or premium, which is comprised of an interest component and a credit component, and is accreted or amortized into interest income over the life of the loan. Expected cash flows in excess of the amount paid are recorded as interest income over the remaining life of the loans (accretable yield). The excess of the loan’s contractual principal and interest over expected cash flows is not recorded (nonaccretable difference). ​ A subsequent Day Two adjustment on non-PCD loans is recorded to the allowance for credit losses immediately after acquisition, which reflects the future estimated lifetime credit losses on the non-PCD loans, recorded through the provision for credit losses. Over the life of the loan, expected cash flows continue to be estimated. If the present value of expected cash flows is less than the carrying amount, a loss is recorded as a provision for credit losses. If the present value of expected cash flows is greater than the carrying value, it is recognized as part of future interest income. ​ On January 1, 2020, the Company implemented ASU No. 2016-13, “Financial Instruments – Credit Measurement of Credit Losses on Financial Instruments (Topic 326),” also known as Current Expected Credit Losses, or CECL. As a result of CECL implementation, the Company’s purchase credit impaired loans (“PCI loans”) became PCD loans.
Allowance for Credit Losses ("ACL")	Allowance for Credit Losses ​ ACL on Loans ​ The ACL on loans is a valuation account that is deducted from the amortized cost basis of loans to present the net amount expected to be collected on loans. The Company’s estimate of the ACL for loans reflects losses expected over the remaining contractual life of the loans. The contractual term does not consider extensions, renewals or modifications unless the Company has identified an expected troubled debt restructuring. ​ Determination of the ACL on loans is inherently subjective in nature since it requires significant estimates and management judgment, and includes a level of imprecision given the difficulty of identifying and assessing the factors impacting loan repayment and estimating the timing and amount of losses. While management utilizes its best judgment and information available, the ultimate adequacy of the ACL is dependent upon a variety of factors beyond the Company’s direct control, including, but not limited to, the performance of the loan portfolio, consideration of current economic trends, changes in interest rates and property values, estimated losses on pools of homogeneous loans based on an analysis that uses historical loss experience for prior periods that are determined to have like characteristics with the current period such as pre-recessionary, recessionary, or recovery periods, portfolio growth and concentration risk, management and staffing changes, the interpretation of loan risk classifications by regulatory authorities and other credit market factors. While each component of the ACL on loans is determined separately, the entire balance is available for the entire loan portfolio. ​ The ACL methodology consists of measuring loans on a collective (pool) basis when similar risk characteristics exist. The type of credit composition and risk characteristics of each portfolio segment are as follows:
Lease financing receivables	Lease financing receivables –
Premises and Equipment	Premises and Equipment – Premises, furniture, equipment, and leasehold improvements are stated at cost less accumulated depreciation and amortization. Depreciation expense is determined by the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized on a straight-line basis over the shorter of the life of the asset or the lease term including anticipated renewals. Rates of depreciation are generally based on the following useful lives: buildings, 25 to 40 years ; building improvements, 3 to 15 years or longer under limited circumstances; and furniture and equipment, 3 to 10 years . Gains and losses on dispositions are included in other noninterest expense in the Consolidated Statements of Income. Maintenance and repairs are charged to operating expenses as incurred, while improvements that conform to definitions of tangible property improvements are capitalized and depreciated over the estimated remaining life. ​ Whenever events or changes in circumstances dictate, the Company tests its long-lived assets for impairment by determining whether the sum of the estimated undiscounted future cash flows attributable to a long-lived asset or asset group is less than the carrying value of the long-lived asset or asset group through a probability-weighted approach. In the event the carrying amount of the long-lived asset or asset group is not recoverable, an impairment loss is measured as the amount by which the carrying amount of the long-lived asset or asset group exceeds its fair value.
Other Real Estate Owned ("OREO")	Other Real Estate Owned (“OREO”)
Mortgage Servicing Rights	Mortgage Servicing Rights ​ Mortgage loans that the Company is servicing for others aggregated to $801.9 million and $793.5 million at December 31, 2021, and 2020, respectively. Mortgage loans that the Company is servicing for others are not included in the consolidated balance sheets. Fees received in connection with servicing loans for others are recognized as earned. Loan servicing costs are charged to expense as incurred. ​ Servicing rights are recognized separately as assets when they are acquired through sales of loans and servicing rights are retained. Servicing rights are initially recorded at fair value with the effect recorded in net gains on sales of mortgage loans in the Consolidated Statements of Income. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses. ​ Servicing fee income, which is included in the Consolidated Statements of Income as mortgage servicing income, is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan and are recorded as income when earned. ​ Under the fair value measurement method, the Company measures mortgage servicing rights at fair value at each reporting date, reports changes in fair value of servicing assets in earnings in the period in which the changes occur, and includes these changes in mortgage servicing rights mark to market in the Consolidated Statements of Income. The fair values of mortgage servicing rights are subject to significant fluctuations as a result of changes in estimated and actual prepayment speeds and default rates and losses.
Bank-Owned Life Insurance ("BOLI")	Bank-Owned Life Insurance (“BOLI”) Balance Sheets at their cash surrender value (“CSV”) or the amount that could be realized. The change in CSV is recorded as an increase in cash surrender value of bank-owned life insurance in the Consolidated Statements of Income in noninterest income. In addition, insurance proceeds received, net of the original premium investment, are recorded as death benefit realized on bank-owned life insurance in the Consolidated Statements of Income in noninterest income.
Goodwill and Core Deposit Intangible	Goodwill and Core Deposit Intangible ​ The Company’s November 30, 2021 and 2020 qualitative goodwill assessments resulted in the Company determining goodwill was not impaired, as it was more likely than not the Company’s fair value exceeded its carrying value. Due to the significant deterioration of economic conditions stemming from the COVID-19 pandemic during 2020, the Company performed interim impairment evaluations at March 31, June 30 and September 30, 2020, to assess impairment indicators, due to the decline in the trading price of our common stock, an elevated U.S. unemployment rate, and the expected impact of the pandemic on our business, operations, and financial condition. As the negative market indicators were not observed over a sustained period of time, we determined it was more likely than not the Company’s fair value exceeded its carrying value. Accordingly, a quantitative analysis was not performed. ​ The core deposit intangible (“CDI”) is being amortized on an accelerated method over a ten year estimated useful life. As of December 31, 2021, CDI totaled $16.3 million, which reflected growth of $14.8 million due to the addition of CDI stemming from the West Suburban acquisition. As of December 31, 2020, CDI totaled $2.2 million, stemming from the Company’s purchase of ABC Bank in 2018 and the Talmer branch purchase in 2016. Total CDI amortization expense of $644,000 , $494,000 , and $539,000 was recorded in 2021, 2020, and 2019, respectively. The expected future annual amortization expense for each of the next five years (2022-2026) is approximately $2.6 million, $2.5 million, $2.3 million, $2.1 million, and $1.8 million, respectively.
Debt Issuance Costs	Debt Issuance Costs – Costs associated with the issuance of debt are presented in the Consolidated Balance Sheet as a direct reduction from the carrying value of that debt liability. The deferred issuance costs are amortized over the life the related debt instrument, and included within the debt’s interest expense.
Loss Contingencies	Loss Contingencies –
Noninterest Income	Noninterest Income ​ Wealth management ​ Service charges on deposits ​ Card related income ​
Advertising Costs	Advertising Costs
Equity Incentive Plan	Equity Incentive Plan data is used to estimate option exercise rates and post-vesting termination behavior, and the risk-free interest rate for the expected term of the option is based on the Treasury yield curve in effect at the time of grant. The market price of the Company’s common stock at the date of grant is used for restricted stock awards, which include restricted stock units. Compensation cost is recognized over the required service period, generally defined as the vesting period, and is net of a 5% forfeiture assumption for group grants. Upon vesting, compensation costs for the award expense is trued up based on actual forfeitures incurred. Once the award is settled, the Company would determine whether the cumulative tax deduction exceeded the cumulative compensation cost recognized in the Consolidated Statement of Income. The cumulative tax deduction would include both the deductions from the dividends and the deduction from the exercise or vesting of the award. If the tax benefit received from the cumulative deductions exceeds the tax effect of the recognized cumulative compensation cost, the excess would be recognized as a credit to income tax expense.
Income Taxes	I ncome Taxes ​ Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using the enacted tax rates that are expected to apply to taxable income in years in which those temporary differences are expected to be recovered or settled. ​ As of December 31, 2021 and 2020 the Company evaluated tax positions taken for filings with the Internal Revenue Service and all state jurisdictions in which it operates. The Company believes that income tax filing positions will be sustained under examination and does not anticipate any adjustments that would result in a material adverse effect on the Company’s financial condition, results of operations, or cash flows. Accordingly, the Company has not recorded any reserves or related accruals for interest and penalties for uncertain tax positions at December 31, 2021 or 2020. The Company is currently open to audit under the statute of limitations for Federal taxes from 2018 to 2020 and various state jurisdictions from 2016 to 2020.
Earnings Per Common Share ("EPS")	Earnings Per Common Share (“EPS”)
Treasury Stock	Treasury Stock
Derivative Financial Instruments	Derivative Financial Instruments ​ If it is determined that the derivative instrument is not highly effective as a hedge, hedge accounting is discontinued, and the adjustment to fair value of the derivative instrument is recorded in earnings. For a derivative used to hedge changes in cash flows associated with forecasted transactions, the gain or loss on the effective portion of the derivative is deferred and reported as a component of accumulated other comprehensive income, which is a component of stockholders’ equity, until such time the hedged transaction affects earnings. For derivative instruments not accounted for as hedges, changes in fair value are recognized in noninterest income/expense. Counterparty risk with loan customers is managed through loan covenant agreements and, as such, does not have a significant impact on the fair value of the swaps. Counterparty risk with other banks is managed through bilateral collateralization agreements. Deferred gains and losses from derivatives not accounted for as hedges and that are terminated are amortized over the shorter of the original remaining term of the derivative or the remaining life of the underlying asset or liability.
Comprehensive Income	Comprehensive Income
Recent Accounting Pronouncements	Recent Accounting Pronouncements : ​ ASU 2018-16, ASU 2020-04 and ASU 2021-01 - Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting. Reference Rate Reform ​ The Company formed a LIBOR transition team in 2019, and has developed a project plan to assess the use of alternative indexes and to ensure all financial instruments that reference LIBOR are identified, quantified, and researched for the LIBOR fallback language available or needed. The Company has completed the International Swaps and Derivatives Association (“ISDA”) protocol adherence for LIBOR fallback language for all commercial swaps, has met with our commercial loan clients to also guide their swap fallback language adherence, and worked to revise all credit documents being issued by our Bank for new loans to ensure appropriate fallback language is included. We have discontinued the use of LIBOR as a reference rate for all consumer loans issued after July 31, 2021, and all commercial loans issued after December 31, 2021, with certain exceptions for those loans in process of funding at the end of 2021. The Company’s systems have been updated to handle multiple SOFR-based indexes and we continue to meet regularly to plan for the transition of existing LIBOR exposures prior to the final LIBOR cessation date of June 30, 2023. ​
Subsequent Events	Subsequent Events ​ On January 18, 2022, the Company’s Board of Directors declared a cash dividend of $0.05 per share payable on February 7, 2022, to stockholders of record as of January 28, 2022.
Mortgage Banking Derivatives.
Summary of Significant Accounting Policies
Derivative Financial Instruments	Mortgage Banking Derivatives .
Commercial
Summary of Significant Accounting Policies
Loans	Commercial loans – Such credits typically comprise working capital loans, loans for physical asset expansion, asset acquisition loans and other commercial and industrial business loans. Loans to closely held businesses will generally be guaranteed in full or for a meaningful amount by the businesses’ major owners. Commercial loans are made based primarily on the historical and projected cash flow of the borrower and secondarily on the underlying collateral provided by the borrower. The cash flows of borrowers, however, may not behave as forecasted and collateral securing loans may fluctuate in value due to economic or individual performance factors. Minimum standards and underwriting guidelines have been established for all commercial loan types. The Company classifies five different risk levels for this segment to assign a loss rate based on historical losses, and also performs an analysis using expectations for the weighted risk rating trends to run a regression analysis to a severe loss scenario to determine adjustments needed within the special mention and substandard sub-segments
Real estate - commercial
Summary of Significant Accounting Policies
Loans	Real estate - commercial loans - ● CRE owner occupied – the Company classifies five different risk levels within this segment to assign a loss rate based on historical losses, as well as utilizing a forecasted average unemployment rate for the next twelve months as a loss driver. ● CRE investor – the Company classifies five different risk levels within this segment to assign a loss rate based on historical losses, as well as utilizing a forecasted average unemployment rate for the next twelve months as a loss driver. The primary difference between this segment and CRE owner occupied is within the slightly elevated historical loss rates and qualitative factors used, as the CRE investor properties are sponsored compared to owner occupied.
Real estate - residential
Summary of Significant Accounting Policies
Loans	Real estate - residential loans ● Residential owner-occupied – the Company applies historical loss rates from periods with like characteristics as the current period, with a longer remaining life than other segments, due to the usually longer-term nature of these loans. ● Residential investor – the Company applies historical loss rates from periods with like characteristics as the current period, with a slightly longer remaining life than other segments, but shorter duration than residential owner-occupied. ● Multifamily – the Company classifies five different risk levels within this segment to assign a loss rate based on historical losses, as well as utilizing a forecasted average unemployment rate for the next twelve months as a loss driver.
Consumer
Summary of Significant Accounting Policies
Loans	Home equity lines of credit (“HELOCs”) ● HELOC legacy - The Company’s historical loss rates are utilized from the prior periods which align to the current unemployment projections. ● HELOC purchased - The Company’s historical loss rates are utilized from the prior periods which align to the current unemployment projections; in addition, the peer data source used for loss rate analysis is the correspondent bank from which we purchased the HELOCs. ​ Consumer loans ​ The methodologies used for calculating the ACL on each loan segment include (i) a migration analysis for commercial, CRE owner occupied, CRE investor, and multifamily segments; (ii) a static analysis for construction, residential investor, residential owner occupied and the legacy HELOC segments; and (iii) a WARM (weighted average remaining life) methodology is used for lease financing receivables, HELOCs purchased, and consumer segments. For loan pools sub-segmented by risk level, which include commercial, real estate-commercial and multifamily segments, linear regression methods were utilized along with expected industry performance over the next twelve months to determine what level of qualitative adjustment would be necessary to account for expected risk rating migration. This methodology relied heavily on existing and anticipated weighted risk ratings by industry or property type. The forecast period used for each segment calculation was one year, with an immediate reversion to historical loss rates following this one year period. In addition, the Company applies qualitative adjustments to each different loan or lease segment, as described below. ​ The qualitative factors applied to each ● changes in lending policies and procedures, including changes in underwriting standards and collections, charge-offs and recovery practices; ● changes in international, national, regionally and local conditions (specific factors which impact portfolios or discrepancies with national economic factors which are utilized within the economic forecast); ● changes in the experience, depth and ability of lending management; ● changes in the volume and severity of past due loans and other similar loan conditions; ● changes in the nature and volume of the loan portfolio and terms of loans; ● the existence and effect of any concentrations of credit and changes in the levels of such concentrations (this characteristic requires any portfolio exceeding 25% of capital to have a factor considered unless the pool is otherwise well diversified or holds a relatively low inherent risk); ● effects of other external factors, such as competition, legal or regulatory factors, on the level of estimated credit losses; ● changes in the quality of our loan review functions; and ● changes in the value of underlying collateral for collateral dependent loans. ​ The impact of the above listed internal and external qualitative and credit market risk factors is assessed within predetermined ranges to adjust the ACL totals calculated. Changes in the above factors are assessed no less than quarterly, and directly impact the total estimated credit losses recorded. Specific factor updates that drove the changes to the total ACL in 2021 included a reduction in the unemployment rate for the forecast period, a decrease in line utilization rates due to continuing borrower liquidity, and the acquisition of West Suburban, which increased loan volumes and total nonperforming loans year over year. The above methods are consistent with the methods utilized in the prior year, since the adoption of CECL as of January 1, 2020. ​ Loans that do not share risk characteristics are evaluated on an individual basis. Such loans evaluated individually are not also included in the collective evaluation. The amount of expected credit loss is measured based upon the present value of expected future cash flows discounted at the loan’s effective interest rate or the fair value of the underlying collateral less applicable selling costs. When management determines that foreclosure is probable, the amount of credit loss is determined using the fair value of collateral, less costs to sell. ​ Loans are charged off against the ACL when management believes the uncollectibility of a loan balance is confirmed, while recoveries of amounts previously charged-off are credited to the ACL. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged off. Approved releases from previously established ACL reserves authorized under our ACL methodology also reduce the ACL. Additions to the ACL are established through the provision for credit losses on loans, which is charged to expense. The Company’s ACL methodology is intended to reflect all loan portfolio risk, but management recognizes the inability to accurately depict all future credit losses in a current ACL estimate, as the impact of various factors cannot be fully known. Accrued interest receivable on loans is excluded from the amortized cost basis of financing receivables for the purpose of determining the allowance for credit losses. ​ ACL on Unfunded Loan Commitments ​ The Company estimates expected credit losses over the contractual period in which the Company is exposed to credit risk by a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Company. The ACL related to off-balance sheet credit exposures, which is within other liabilities on the Company’s Consolidated Balance Sheets, is estimated at each balance sheet date under the CECL model, and is adjusted as determined necessary through the provision for credit losses on the income statement. The estimate for ACL on unfunded loan commitments includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over its estimated life.
Real estate - construction | Real estate - commercial
Summary of Significant Accounting Policies
Loans	Real estate – construction loans – The Company defines real estate - construction loans as loans where the loan proceeds are controlled by the Company and used exclusively for the improvement or development of real estate in which the Company holds a mortgage. Due to the inherent risk in this type of loan, they are subject to other industry specific policy guidelines outlined in the Company’s Credit Risk Policy and are monitored closely. The Company’s historical loss rates are utilized from the prior periods which align to the current unemployment projections.

Acquisition (Tables)

Acquisition (Tables)	12 Months Ended
	Dec. 31, 2021
Acquisition
Summary of acquisition	​ ​ ​ ​ ​ West Suburban Acquisition Summary ​ ​ ​ As of Date of Acquisition ​ ​ ​ ​ ​ December 1, 2021 Assets ​ ​ ​ Cash and due from banks ​ $ 16,794 Interest bearing deposits with financial institutions ​ ​ 232,880 Securities available-for-sale and held-to maturity, at fair value ​ ​ 1,066,373 FHLBC stock ​ ​ 3,340 Loans ​ ​ 1,502,118 Premises and equipment ​ ​ 47,456 Other real estate owned ​ ​ 5,552 Core deposit intangible ​ ​ 14,772 Deferred tax assets ​ ​ 2,093 Other assets ​ ​ 52,710 Total assets ​ $ 2,944,088 ​ ​ ​ ​ Liabilities ​ ​ ​ Noninterest bearing demand ​ $ 409,141 Savings, NOW and money market ​ ​ 2,069,890 Time ​ ​ 215,205 Total deposits ​ ​ 2,694,236 Reserve for unfunded commitments ​ ​ 1,787 Other liabilities ​ ​ 20,629 Total liabilities ​ ​ 2,716,652 ​ ​ ​ ​ Cash consideration paid ​ ​ 100,679 Stock issued for acquisition ​ ​ 194,484 Total Liabilities Assumed and Cash and Stock Consideration Paid for Acquisition ​ $ 3,011,815 Goodwill ​ $ 67,727
Schedule of Purchase price of loans at acquisition	​ ​ ​ ​ ​ ​ ​ As of West Suburban Acquired PCD Loans ​ December 1, 2021 Par value of acquired loans ​ $ 108,241 Allowance for credit losses ​ ​ (12,075) Non-credit discount ​ ​ (1,723) Purchase price of PCD loans at acquisition ​ $ 94,443
Schedule of Unaudited Pro Forma	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unaudited Pro Forma for the Years Ended ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 Net interest income ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 166,495 ​ $ 165,283 Noninterest income ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 59,036 ​ ​ 48,937 Net income attributable to Old Second Bancorp, Inc. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 67,779 ​ ​ 12,349

Securities (Tables)

Securities (Tables)	12 Months Ended
	Dec. 31, 2021
Securities
Schedule of amortized cost and fair value of the securities portfolio and corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive loss	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair December 31, 2021 Cost 1 Gains Losses ​ Value Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 202,251 ​ $ 125 ​ $ (37) ​ $ 202,339 U.S. government agencies ​ ​ 62,587 ​ ​ - ​ ​ (699) ​ ​ 61,888 U.S. government agencies mortgage-backed ​ ​ 172,016 ​ ​ 856 ​ ​ (570) ​ ​ 172,302 States and political subdivisions ​ ​ 240,793 ​ ​ 16,344 ​ ​ (672) ​ ​ 256,465 Corporate bonds ​ ​ 10,000 ​ ​ - ​ ​ (113) ​ ​ 9,887 Collateralized mortgage obligations ​ ​ 673,238 ​ ​ 2,014 ​ ​ (2,285) ​ ​ 672,967 Asset-backed securities ​ ​ 236,293 ​ ​ 1,245 ​ ​ (661) ​ ​ 236,877 Collateralized loan obligations ​ ​ 79,838 ​ ​ 3 ​ ​ (78) ​ ​ 79,763 Total securities available-for-sale ​ $ 1,677,016 ​ $ 20,587 ​ $ (5,115) ​ $ 1,692,488 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair December 31, 2020 Cost 1 Gains Losses ​ Value Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 4,014 ​ $ 103 ​ $ - ​ $ 4,117 U.S. government agencies ​ ​ 6,811 ​ ​ - ​ ​ (154) ​ ​ 6,657 U.S. government agencies mortgage-backed ​ ​ 16,098 ​ ​ 1,112 ​ ​ (1) ​ ​ 17,209 States and political subdivisions ​ ​ 229,352 ​ ​ 21,269 ​ ​ (1,362) ​ ​ 249,259 Collateralized mortgage obligations ​ ​ 53,999 ​ ​ 2,866 ​ ​ (280) ​ ​ 56,585 Asset-backed securities ​ ​ 130,959 ​ ​ 1,370 ​ ​ (511) ​ ​ 131,818 Collateralized loan obligations ​ ​ 30,728 ​ ​ 15 ​ ​ (210) ​ ​ 30,533 Total securities available-for-sale ​ $ 471,961 ​ $ 26,735 ​ $ (2,518) ​ $ 496,178 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 Excludes interest receivable of $4.3 million and $2.7 million at December 31, 2021 and December 31, 2020, respectively, that is recorded in other assets on the consolidated balance sheet. ​
Schedule of fair value, amortized cost and weighted average yield of debt securities by contractual maturity along with securities not due at a single maturity date, primarily mortgage-backed securities (MBS), asset-backed securities, and collateralized loan obligations	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ ​ ​ Amortized ​ Average ​ ​ Fair ​ Securities available-for-sale Cost Yield ​ Value Due in one year or less ​ $ 8,671 ​ 1.24 % ​ $ 8,707 ​ Due after one year through five years ​ ​ 274,984 ​ 0.89 ​ ​ ​ 274,537 ​ Due after five years through ten years ​ ​ 43,770 ​ 2.43 ​ ​ ​ 45,470 ​ Due after ten years ​ ​ 188,206 ​ 2.98 ​ ​ ​ 201,865 ​ ​ ​ ​ 515,631 ​ 1.79 ​ ​ ​ 530,579 ​ Mortgage-backed and collateralized mortgage obligations ​ ​ 845,254 ​ 1.19 ​ ​ ​ 845,269 ​ Asset-backed securities ​ ​ 236,293 ​ 1.12 ​ ​ ​ 236,877 ​ Collateralized loan obligations ​ ​ 79,838 ​ 1.60 ​ ​ ​ 79,763 ​ Total securities available-for-sale ​ $ 1,677,016 ​ 1.38 % ​ $ 1,692,488 ​
Schedule of securities with unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position	Securities with unrealized losses with no corresponding allowance for credit losses at December 31, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows (in thousands except for number of securities): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less than 12 months ​ 12 months or more ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ in an unrealized loss position ​ in an unrealized loss position ​ Total ​ ​ Number of ​ Unrealized ​ Fair ​ Number of ​ Unrealized ​ Fair ​ Number of ​ Unrealized ​ Fair Securities available-for-sale Securities Losses Value Securities Losses Value Securities Losses Value U.S. Treasuries ​ 1 ​ $ 37 ​ $ 49,719 ​ - ​ $ - ​ $ - ​ 1 ​ $ 37 ​ $ 49,719 U.S. government agencies ​ 5 ​ $ 592 ​ $ 56,879 ​ 4 ​ $ 107 ​ $ 5,008 ​ 9 ​ $ 699 ​ $ 61,887 U.S. government agencies mortgage-backed ​ 63 ​ ​ 505 ​ ​ 78,711 ​ 1 ​ ​ 65 ​ ​ 1,663 ​ 64 ​ ​ 570 ​ ​ 80,374 States and political subdivisions ​ 7 ​ ​ 55 ​ ​ 8,430 ​ 1 ​ ​ 617 ​ ​ 4,051 ​ 8 ​ ​ 672 ​ ​ 12,481 Corporate bonds ​ 2 ​ ​ 113 ​ ​ 9,887 ​ - ​ ​ - ​ ​ - ​ 2 ​ ​ 113 ​ ​ 9,887 Collateralized mortgage obligations ​ 133 ​ ​ 2,285 ​ ​ 381,658 ​ - ​ ​ - ​ ​ - ​ 133 ​ ​ 2,285 ​ ​ 381,658 Asset-backed securities ​ 20 ​ ​ 608 ​ ​ 103,819 ​ 3 ​ ​ 53 ​ ​ 3,276 ​ 23 ​ ​ 661 ​ ​ 107,095 Collateralized loan obligations ​ 10 ​ ​ 35 ​ ​ 45,132 ​ 2 ​ ​ 43 ​ ​ 10,628 ​ 12 ​ ​ 78 ​ ​ 55,760 Total securities available-for-sale ​ 241 ​ $ 4,230 ​ $ 734,235 ​ 11 ​ $ 885 ​ $ 24,626 ​ 252 ​ $ 5,115 ​ $ 758,861 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less than 12 months ​ 12 months or more ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ in an unrealized loss position ​ in an unrealized loss position ​ Total ​ ​ Number of ​ Unrealized ​ ​ Fair ​ Number of ​ Unrealized ​ ​ Fair ​ Number of ​ Unrealized ​ ​ Fair Securities available-for-sale Securities Losses ​ Value Securities Losses ​ Value Securities Losses ​ Value U.S. government agencies ​ - ​ $ - ​ $ - ​ 4 ​ $ 154 ​ $ 6,657 ​ 4 ​ $ 154 ​ $ 6,657 U.S. government agencies mortgage-backed ​ 1 ​ ​ 1 ​ ​ 141 ​ - ​ ​ - ​ ​ - ​ 1 ​ ​ 1 ​ ​ 141 States and political subdivisions ​ - ​ ​ - ​ ​ - ​ 1 ​ ​ 1,362 ​ ​ 3,433 ​ 1 ​ ​ 1,362 ​ ​ 3,433 Collateralized mortgage obligations ​ 4 ​ ​ 279 ​ ​ 8,142 ​ 1 ​ ​ 1 ​ ​ 146 ​ 5 ​ ​ 280 ​ ​ 8,288 Asset-backed securities ​ 1 ​ ​ 2 ​ ​ 251 ​ 3 ​ ​ 509 ​ ​ 49,572 ​ 4 ​ ​ 511 ​ ​ 49,823 Collateralized loan obligations ​ 1 ​ ​ 31 ​ ​ 7,468 ​ 4 ​ ​ 179 ​ ​ 21,477 ​ 5 ​ ​ 210 ​ ​ 28,945 Total securities available-for-sale ​ 7 ​ $ 313 ​ $ 16,002 ​ 13 ​ $ 2,205 ​ $ 81,285 ​ 20 ​ $ 2,518 ​ $ 97,287 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of proceeds from sale and gross realized gains and losses on sale of securities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ ​ ​ December 31, ​ Securities available-for-sale 2021 2020 2019 ​ Proceeds from sales of securities ​ $ 605,846 ​ $ 18,006 ​ $ 191,298 ​ Gross realized gains on securities ​ 270 ​ 17 ​ 5,521 ​ Gross realized losses on securities ​ (38) ​ (42) ​ (1,010) ​ Net realized gains (losses) ​ $ 232 ​ $ (25) ​ $ 4,511 ​ Income tax (expense) benefit on net realized gains (losses) ​ $ (65) ​ $ 7 ​ $ (1,267) ​ Effective tax rate applied ​ ​ 28.0 % ​ 28.0 % ​ 28.1 %

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses on Loans (Tables)	12 Months Ended
	Dec. 31, 2021
Loans and Allowance for Credit Losses on Loans
Schedule of major classifications of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 December 31, 2020 Commercial 1 ​ $ 771,474 ​ $ 407,159 Leases ​ ​ 176,031 ​ ​ 141,601 Commercial real estate - Investor ​ ​ 957,389 ​ ​ 582,042 Commercial real estate - Owner occupied ​ ​ 574,384 ​ ​ 333,070 Construction ​ ​ 206,132 ​ ​ 98,486 Residential real estate - Investor ​ ​ 63,399 ​ ​ 56,137 Residential real estate - Owner occupied ​ ​ 213,248 ​ ​ 116,388 Multifamily ​ ​ 309,164 ​ ​ 189,040 HELOC ​ ​ 115,664 ​ ​ 80,908 HELOC - Purchased ​ ​ 10,626 ​ ​ 19,487 Other 2 ​ ​ 24,437 ​ ​ 10,533 Total loans ​ ​ 3,421,948 ​ ​ 2,034,851 Allowance for credit losses on loans ​ ​ (44,281) ​ ​ (33,855) Net loans 3 ​ $ 3,377,667 ​ $ 2,000,996 ​ 1 Includes $38.4 million and $74.1 million of PPP loans outstanding at December 31, 2021 and 2020, respectively. ​ 2 Unless otherwise noted, the “Other” segment includes consumer loans and overdrafts in this table and in subsequent tables within Note 5 - Loans and Allowance for Credit Losses on Loans. ​ 3 Excludes accrued interest receivable of $9.2 million and $7.0 million at December 31, 2021 and December 31, 2020, respectively, which is recorded in other assets on the consolidated balance sheet.
Schedule of changes in the allowance for loan losses by segment of loans based on method of impairment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table represent the activity in the ACL for loans for the year ended December 31, 2021 and 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impact of ​ Provision for ​ ​ ​ ​ ​ ​ ​ ​ Beginning ​ WSB Acquisition ​ (Release of) ​ ​ ​ ​ ​ Ending Allowance for credit losses Balance with PCD Loans Credit Losses Charge-offs Recoveries Balance ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial ​ $ 2,812 ​ $ 7,161 ​ $ 2,389 ​ $ 963 ​ $ 352 ​ $ 11,751 Leases ​ ​ 3,888 ​ ​ - ​ ​ (339) ​ ​ 69 ​ ​ - ​ ​ 3,480 Commercial real estate - Investor ​ ​ 9,205 ​ ​ 1,877 ​ ​ 4,657 ​ ​ 2,724 ​ ​ 78 ​ ​ 13,093 Commercial real estate - Owner occupied ​ ​ 2,251 ​ ​ 2,771 ​ ​ (845) ​ ​ 1,797 ​ ​ 235 ​ ​ 2,615 Construction ​ ​ 4,054 ​ ​ 102 ​ ​ (783) ​ ​ - ​ ​ - ​ ​ 3,373 Residential real estate - Investor ​ ​ 1,740 ​ ​ 23 ​ ​ (1,294) ​ ​ - ​ ​ 291 ​ ​ 760 Residential real estate - Owner occupied ​ ​ 2,714 ​ ​ 136 ​ ​ (176) ​ ​ - ​ ​ 158 ​ ​ 2,832 Multifamily ​ ​ 3,625 ​ ​ - ​ ​ 233 ​ ​ 183 ​ ​ - ​ ​ 3,675 HELOC ​ ​ 1,749 ​ ​ 5 ​ ​ 408 ​ ​ 17 ​ ​ 234 ​ ​ 2,379 HELOC - Purchased ​ ​ 199 ​ ​ - ​ ​ (68) ​ ​ - ​ ​ - ​ ​ 131 Other ​ ​ 1,618 ​ ​ - ​ ​ (1,387) ​ ​ 180 ​ ​ 141 ​ ​ 192 Ending Balance, December 31, 2021 ​ $ 33,855 ​ $ 12,075 ​ $ 2,795 ​ $ 5,933 ​ $ 1,489 ​ $ 44,281 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Impact of ​ Provision for ​ ​ ​ ​ ​ ​ Allowance for credit losses ​ Beginning ​ Adopting ​ (Release of) ​ ​ ​ ​ ​ Ending ​ Balance ASC 326 Credit Losses Charge-offs Recoveries Balance Commercial ​ $ 3,015 ​ $ (292) ​ $ 72 ​ $ 39 ​ $ 56 ​ $ 2,812 Leases ​ ​ 1,262 ​ ​ 501 ​ ​ 2,233 ​ ​ 206 ​ ​ 98 ​ ​ 3,888 Commercial real estate - Investor ​ ​ 6,218 ​ ​ (741) ​ ​ 4,075 ​ ​ 512 ​ ​ 165 ​ ​ 9,205 Commercial real estate - Owner occupied ​ ​ 3,678 ​ ​ (848) ​ ​ 487 ​ ​ 1,763 ​ ​ 697 ​ ​ 2,251 Construction ​ ​ 513 ​ ​ 1,334 ​ ​ 2,095 ​ ​ 60 ​ ​ 172 ​ ​ 4,054 Residential real estate - Investor ​ ​ 601 ​ ​ 740 ​ ​ 350 ​ ​ 8 ​ ​ 57 ​ ​ 1,740 Residential real estate - Owner occupied ​ ​ 1,257 ​ ​ 1,320 ​ ​ (107) ​ ​ 43 ​ ​ 287 ​ ​ 2,714 Multifamily ​ ​ 1,444 ​ ​ 1,732 ​ ​ 449 ​ ​ - ​ ​ - ​ ​ 3,625 HELOC ​ ​ 1,161 ​ ​ 1,526 ​ ​ (1,198) ​ ​ 127 ​ ​ 387 ​ ​ 1,749 HELOC - Purchased ​ ​ - ​ ​ - ​ ​ 265 ​ ​ 66 ​ ​ - ​ ​ 199 Other ​ ​ 640 ​ ​ 607 ​ ​ 445 ​ ​ 244 ​ ​ 170 ​ ​ 1,618 Ending Balance, December 31, 2020 ​ $ 19,789 ​ $ 5,879 ​ $ 9,166 ​ $ 3,068 ​ $ 2,089 ​ $ 33,855 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table presents activity in the allowance for loan and lease losses for the years ended December 31, 2019, as determined in accordance with ASC 310 prior to the adoption of ASU 2016-13: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Provision ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning ​ for Loan ​ ​ ​ ​ ​ Ending Allowance for loan and lease losses: ​ Balance Losses Charge-offs Recoveries Balance Commercial ​ ​ ​ ​ $ 2,832 ​ $ 218 ​ $ 109 ​ $ 74 ​ $ 3,015 Leases ​ ​ ​ ​ ​ 734 ​ ​ 577 ​ ​ 49 ​ ​ - ​ ​ 1,262 Commercial real estate - Investor ​ ​ ​ ​ ​ 6,339 ​ ​ (497) ​ ​ 303 ​ ​ 679 ​ ​ 6,218 Commercial real estate - Owner occupied ​ ​ ​ ​ ​ 3,515 ​ ​ 874 ​ ​ 716 ​ ​ 5 ​ ​ 3,678 Construction ​ ​ ​ ​ ​ 969 ​ ​ (448) ​ ​ 9 ​ ​ 1 ​ ​ 513 Residential real estate - Investor ​ ​ ​ ​ ​ 554 ​ ​ 43 ​ ​ 7 ​ ​ 11 ​ ​ 601 Residential real estate - Owner occupied ​ ​ ​ ​ ​ 1,377 ​ ​ (86) ​ ​ 111 ​ ​ 77 ​ ​ 1,257 Multifamily ​ ​ ​ ​ ​ 616 ​ ​ 813 ​ ​ - ​ ​ 15 ​ ​ 1,444 HELOC ​ ​ ​ ​ ​ 1,449 ​ ​ (351) ​ ​ 109 ​ ​ 172 ​ ​ 1,161 HELOC - Purchased ​ ​ ​ ​ ​ - ​ ​ 229 ​ ​ 229 ​ ​ - ​ ​ - Other ​ ​ ​ ​ ​ 621 ​ ​ 228 ​ ​ 409 ​ ​ 200 ​ ​ 640 Ending Balance, December 31, 2019 ​ ​ ​ ​ $ 19,006 ​ $ 1,600 ​ $ 2,051 ​ $ 1,234 ​ $ 19,789 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of collateral dependent loans and related loan allowances.	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accounts ​ ​ ​ ​ ​ ​ ​ ACL December 31, 2021 ​ Real Estate ​ Receivable ​ Equipment ​ Other ​ Total ​ Allocation Commercial ​ $ 1,986 ​ $ 9,901 ​ $ - ​ $ - ​ $ 11,887 ​ $ 2,677 Leases ​ ​ - ​ ​ - ​ ​ 3,249 ​ ​ 505 ​ ​ 3,754 ​ ​ 811 Commercial real estate - Investor ​ ​ 5,693 ​ ​ - ​ ​ - ​ ​ - ​ ​ 5,693 ​ ​ - Commercial real estate - Owner occupied ​ ​ 9,147 ​ ​ - ​ ​ - ​ ​ 2,490 ​ ​ 11,637 ​ ​ 362 Construction ​ ​ 2,104 ​ ​ - ​ ​ - ​ ​ - ​ ​ 2,104 ​ ​ 992 Residential real estate - Investor ​ ​ 925 ​ ​ - ​ ​ - ​ ​ - ​ ​ 925 ​ ​ - Residential real estate - Owner occupied ​ ​ 4,271 ​ ​ - ​ ​ - ​ ​ - ​ ​ 4,271 ​ ​ 276 Multifamily ​ ​ 1,845 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,845 ​ ​ 75 HELOC ​ ​ 826 ​ ​ - ​ ​ - ​ ​ - ​ ​ 826 ​ ​ 190 HELOC - Purchased ​ ​ 180 ​ ​ - ​ ​ - ​ ​ - ​ ​ 180 ​ ​ - Other ​ ​ - ​ ​ - ​ ​ - ​ ​ 7 ​ ​ 7 ​ ​ 4 Total ​ $ 26,977 ​ $ 9,901 ​ $ 3,249 ​ $ 3,002 ​ $ 43,129 ​ $ 5,387 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accounts ​ ​ ​ ​ ​ ​ ​ ACL December 31, 2020 ​ Real Estate ​ Receivable ​ Equipment ​ Other ​ Total ​ Allocation Commercial ​ $ - ​ $ 1,070 ​ $ - ​ $ 55 ​ $ 1,125 ​ $ 56 Leases ​ ​ - ​ ​ - ​ ​ 2,377 ​ ​ 597 ​ ​ 2,974 ​ ​ 880 Commercial real estate - Investor ​ ​ 4,179 ​ ​ - ​ ​ - ​ ​ - ​ ​ 4,179 ​ ​ 84 Commercial real estate - Owner occupied ​ ​ 9,726 ​ ​ - ​ ​ - ​ ​ - ​ ​ 9,726 ​ ​ 195 Construction ​ ​ 1,891 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,891 ​ ​ 952 Residential real estate - Investor ​ ​ 928 ​ ​ - ​ ​ - ​ ​ - ​ ​ 928 ​ ​ - Residential real estate - Owner occupied ​ ​ 3,535 ​ ​ - ​ ​ - ​ ​ - ​ ​ 3,535 ​ ​ 10 Multifamily ​ ​ 3,838 ​ ​ - ​ ​ - ​ ​ - ​ ​ 3,838 ​ ​ 378 HELOC ​ ​ 1,053 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,053 ​ ​ 78 HELOC - Purchased ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Other ​ ​ - ​ ​ - ​ ​ - ​ ​ 4 ​ ​ 4 ​ ​ 4 Total ​ $ 25,150 ​ $ 1,070 ​ $ 2,377 ​ $ 656 ​ $ 29,253 ​ $ 2,637 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of aged analysis of past due loans by class of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 90 days or ​ ​ ​ ​ ​ ​ ​ ​ 90 Days or ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Greater Past ​ ​ 30-59 Days ​ 60-89 Days ​ Greater Past ​ Total Past ​ ​ ​ ​ ​ ​ ​ Due and December 31, 2021 1 ​ Past Due Past Due Due Due Current Total Loans Accruing Commercial ​ $ 3,407 ​ $ 1,413 ​ $ 1,828 ​ $ 6,648 ​ $ 764,826 ​ $ 771,474 ​ $ 1,396 Leases ​ ​ 125 ​ ​ - ​ ​ 1,571 ​ ​ 1,696 ​ ​ 174,335 ​ ​ 176,031 ​ ​ - Commercial real estate - Investor ​ ​ - ​ ​ 267 ​ ​ 1,107 ​ ​ 1,374 ​ ​ 956,015 ​ ​ 957,389 ​ ​ - Commercial real estate - Owner occupied ​ ​ 2,324 ​ ​ 500 ​ ​ 4,848 ​ ​ 7,672 ​ ​ 566,712 ​ ​ 574,384 ​ ​ 1,594 Construction ​ ​ 854 ​ ​ - ​ ​ - ​ ​ 854 ​ ​ 205,278 ​ ​ 206,132 ​ ​ - Residential real estate - Investor ​ ​ 395 ​ ​ 470 ​ ​ 792 ​ ​ 1,657 ​ ​ 61,742 ​ ​ 63,399 ​ ​ 23 Residential real estate - Owner occupied ​ ​ 1,994 ​ ​ 591 ​ ​ 3,077 ​ ​ 5,662 ​ ​ 207,586 ​ ​ 213,248 ​ ​ 97 Multifamily ​ ​ - ​ ​ 1,046 ​ ​ - ​ ​ 1,046 ​ ​ 308,118 ​ ​ 309,164 ​ ​ - HELOC ​ ​ 193 ​ ​ 23 ​ ​ 218 ​ ​ 434 ​ ​ 115,230 ​ ​ 115,664 ​ ​ - HELOC - Purchased ​ ​ - ​ ​ - ​ ​ 180 ​ ​ 180 ​ ​ 10,446 ​ ​ 10,626 ​ ​ - Other ​ ​ 50 ​ ​ 46 ​ ​ 23 ​ ​ 119 ​ ​ 24,318 ​ ​ 24,437 ​ ​ - Total ​ $ 9,342 ​ $ 4,356 ​ $ 13,644 ​ $ 27,342 ​ $ 3,394,606 ​ $ 3,421,948 ​ $ 3,110 ​ 1 Loans modified under the CARES Act are considered current if they are in compliance with the modified terms. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 90 days or ​ ​ ​ ​ ​ ​ ​ ​ 90 Days or ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Greater Past ​ ​ 30-59 Days ​ 60-89 Days ​ Greater Past ​ Total Past ​ ​ ​ ​ ​ ​ ​ Due and December 31, 2020 1 ​ Past Due Past Due Due Due Current Total Loans Accruing Commercial ​ $ - ​ $ - ​ $ 52 ​ $ 52 ​ $ 407,107 ​ $ 407,159 ​ $ - Leases ​ ​ 613 ​ ​ 59 ​ ​ 316 ​ ​ 988 ​ ​ 140,613 ​ ​ 141,601 ​ ​ 163 Commercial real estate - Investor ​ ​ 1,439 ​ ​ - ​ ​ 1,108 ​ ​ 2,547 ​ ​ 579,495 ​ ​ 582,042 ​ ​ - Commercial real estate - Owner occupied ​ ​ 1,848 ​ ​ 958 ​ ​ 7,309 ​ ​ 10,115 ​ ​ 322,955 ​ ​ 333,070 ​ ​ - Construction ​ ​ 1,237 ​ ​ - ​ ​ - ​ ​ 1,237 ​ ​ 97,249 ​ ​ 98,486 ​ ​ - Residential real estate - Investor ​ ​ 1,022 ​ ​ 20 ​ ​ 484 ​ ​ 1,526 ​ ​ 54,611 ​ ​ 56,137 ​ ​ 157 Residential real estate - Owner occupied ​ ​ 859 ​ ​ 286 ​ ​ 717 ​ ​ 1,862 ​ ​ 114,526 ​ ​ 116,388 ​ ​ 114 Multifamily ​ ​ 3,282 ​ ​ 467 ​ ​ - ​ ​ 3,749 ​ ​ 185,291 ​ ​ 189,040 ​ ​ - HELOC ​ ​ 549 ​ ​ 50 ​ ​ 206 ​ ​ 805 ​ ​ 80,103 ​ ​ 80,908 ​ ​ - HELOC - Purchased ​ ​ 47 ​ ​ - ​ ​ - ​ ​ 47 ​ ​ 19,440 ​ ​ 19,487 ​ ​ - Other ​ ​ 20 ​ ​ - ​ ​ - ​ ​ 20 ​ ​ 10,513 ​ ​ 10,533 ​ ​ - Total ​ $ 10,916 ​ $ 1,840 ​ $ 10,192 ​ $ 22,948 ​ $ 2,011,903 ​ $ 2,034,851 ​ $ 434 ​ 1 Loans modified under the CARES Act are considered current if they are in compliance with the modified terms.
Schedule of loans on nonaccrual for which there was no related allowance	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nonaccrual loan detail December 31, 2021 With no ACL December 31, 2020 With no ACL Commercial ​ $ 11,894 ​ $ 9,217 ​ $ 1,125 ​ $ 1,070 Leases ​ ​ 3,754 ​ ​ 2,943 ​ ​ 2,638 ​ ​ 309 Commercial real estate - Investor ​ ​ 5,694 ​ ​ 5,694 ​ ​ 1,632 ​ ​ 1,632 Commercial real estate - Owner occupied ​ ​ 11,637 ​ ​ 11,205 ​ ​ 9,262 ​ ​ 6,780 Construction ​ ​ 160 ​ ​ 160 ​ ​ - ​ ​ - Residential real estate - Investor ​ ​ 876 ​ ​ 876 ​ ​ 928 ​ ​ 928 Residential real estate - Owner occupied ​ ​ 4,898 ​ ​ 4,622 ​ ​ 3,206 ​ ​ 3,206 Multifamily ​ ​ 1,573 ​ ​ 1,573 ​ ​ 2,437 ​ ​ 2,437 HELOC ​ ​ 862 ​ ​ 672 ​ ​ 1,052 ​ ​ 845 HELOC - Purchased ​ ​ 180 ​ ​ 180 ​ ​ - ​ ​ - Other ​ ​ 3 ​ ​ 3 ​ ​ - ​ ​ - Total ​ $ 41,531 ​ $ 37,145 ​ $ 22,280 ​ $ 17,207
Schedule of credit quality indicators by class of loans	Credit Quality Indicators by class of loans as of December 31, 2021 were as follows in the vintage table below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Converted ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ To Term ​ ​ ​ 2021 2020 2019 2018 2017 Prior Loans Loans Total Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 192,258 ​ $ 50,638 ​ $ 38,614 ​ $ 28,177 ​ $ 5,176 ​ $ 10,945 ​ $ 408,394 ​ $ 30 ​ $ 734,232 Special Mention ​ ​ 44 ​ ​ 84 ​ ​ 694 ​ ​ - ​ ​ - ​ ​ - ​ ​ 3,708 ​ ​ - ​ ​ 4,530 Substandard ​ ​ 9,498 ​ ​ 4,048 ​ ​ 14,121 ​ ​ 326 ​ ​ - ​ ​ 75 ​ ​ 4,644 ​ ​ - ​ ​ 32,712 Total commercial ​ ​ 201,800 ​ ​ 54,770 ​ ​ 53,429 ​ ​ 28,503 ​ ​ 5,176 ​ ​ 11,020 ​ ​ 416,746 ​ ​ 30 ​ ​ 771,474 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Leases ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 83,402 ​ ​ 44,129 ​ $ 32,259 ​ ​ 8,950 ​ ​ 1,170 ​ ​ 2,367 ​ ​ - ​ ​ - ​ ​ 172,277 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ 2,834 ​ ​ 623 ​ ​ - ​ ​ 297 ​ ​ - ​ ​ - ​ ​ 3,754 Total leases ​ ​ 83,402 ​ ​ 44,129 ​ ​ 35,093 ​ ​ 9,573 ​ ​ 1,170 ​ ​ 2,664 ​ ​ - ​ ​ - ​ ​ 176,031 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate - Investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 315,247 ​ ​ 233,964 ​ ​ 147,511 ​ ​ 85,049 ​ ​ 64,810 ​ ​ 55,523 ​ ​ 18,602 ​ ​ - ​ ​ 920,706 Special Mention ​ ​ 15,466 ​ ​ - ​ ​ 10,550 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 26,016 Substandard ​ ​ 2,238 ​ ​ 2,378 ​ ​ 451 ​ ​ 181 ​ ​ 3,612 ​ ​ 1,807 ​ ​ - ​ ​ - ​ ​ 10,667 Total commercial real estate - investor ​ ​ 332,951 ​ ​ 236,342 ​ ​ 158,512 ​ ​ 85,230 ​ ​ 68,422 ​ ​ 57,330 ​ ​ 18,602 ​ ​ - ​ ​ 957,389 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate - Owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 220,324 ​ ​ 96,607 ​ ​ 61,511 ​ ​ 60,915 ​ ​ 54,236 ​ ​ 59,887 ​ ​ 2,522 ​ ​ - ​ ​ 556,002 Special Mention ​ ​ - ​ ​ - ​ ​ 2,953 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 2,953 Substandard ​ ​ 8,318 ​ ​ 942 ​ ​ 1,686 ​ ​ - ​ ​ 1,251 ​ ​ 3,232 ​ ​ - ​ ​ - ​ ​ 15,429 Total commercial real estate - owner occupied ​ ​ 228,642 ​ ​ 97,549 ​ ​ 66,150 ​ ​ 60,915 ​ ​ 55,487 ​ ​ 63,119 ​ ​ 2,522 ​ ​ - ​ ​ 574,384 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 88,620 ​ ​ 65,629 ​ ​ 37,169 ​ ​ 2,727 ​ ​ 477 ​ ​ 1,193 ​ ​ 1,143 ​ ​ - ​ ​ 196,958 Special Mention ​ ​ - ​ ​ 2,138 ​ ​ 4,932 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 7,070 Substandard ​ ​ 160 ​ ​ - ​ ​ - ​ ​ 1,944 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 2,104 Total construction ​ ​ 88,780 ​ ​ 67,767 ​ ​ 42,101 ​ ​ 4,671 ​ ​ 477 ​ ​ 1,193 ​ ​ 1,143 ​ ​ - ​ ​ 206,132 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate - Investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 13,371 ​ ​ 9,758 ​ ​ 13,084 ​ ​ 6,392 ​ ​ 7,059 ​ ​ 10,602 ​ ​ 1,868 ​ ​ - ​ ​ 62,134 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ 121 ​ ​ 144 ​ ​ - ​ ​ 197 ​ ​ 385 ​ ​ 418 ​ ​ - ​ ​ - ​ ​ 1,265 Total residential real estate - investor ​ ​ 13,492 ​ ​ 9,902 ​ ​ 13,084 ​ ​ 6,589 ​ ​ 7,444 ​ ​ 11,020 ​ ​ 1,868 ​ ​ - ​ ​ 63,399 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate - Owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 48,009 ​ ​ 31,912 ​ ​ 20,990 ​ ​ 13,304 ​ ​ 30,562 ​ ​ 60,661 ​ ​ 2,052 ​ ​ - ​ ​ 207,490 Special Mention ​ ​ 659 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 659 Substandard ​ ​ 322 ​ ​ 183 ​ ​ 6 ​ ​ 1,219 ​ ​ 176 ​ ​ 3,193 ​ ​ - ​ ​ - ​ ​ 5,099 Total residential real estate - owner occupied ​ ​ 48,990 ​ ​ 32,095 ​ ​ 20,996 ​ ​ 14,523 ​ ​ 30,738 ​ ​ 63,854 ​ ​ 2,052 ​ ​ - ​ ​ 213,248 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Multifamily ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 109,175 ​ ​ 71,748 ​ ​ 39,293 ​ ​ 61,190 ​ ​ 11,399 ​ ​ 7,117 ​ ​ 64 ​ ​ - ​ ​ 299,986 Special Mention ​ ​ - ​ ​ - ​ ​ 6,900 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 6,900 Substandard ​ ​ 433 ​ ​ - ​ ​ - ​ ​ 1,543 ​ ​ 302 ​ ​ - ​ ​ - ​ ​ - ​ ​ 2,278 Total multifamily ​ ​ 109,608 ​ ​ 71,748 ​ ​ 46,193 ​ ​ 62,733 ​ ​ 11,701 ​ ​ 7,117 ​ ​ 64 ​ ​ - ​ ​ 309,164 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HELOC ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 907 ​ ​ 2,091 ​ ​ 2,131 ​ ​ 805 ​ ​ 1,667 ​ ​ 1,869 ​ ​ 104,843 ​ ​ - ​ ​ 114,313 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 108 ​ ​ - ​ ​ 108 Substandard ​ ​ - ​ ​ - ​ ​ - ​ ​ 17 ​ ​ 12 ​ ​ 196 ​ ​ 1,018 ​ ​ - ​ ​ 1,243 Total HELOC ​ ​ 907 ​ ​ 2,091 ​ ​ 2,131 ​ ​ 822 ​ ​ 1,679 ​ ​ 2,065 ​ ​ 105,969 ​ ​ - ​ ​ 115,664 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HELOC - Purchased ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 10,446 ​ ​ - ​ ​ - ​ ​ 10,446 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 180 ​ ​ - ​ ​ - ​ ​ 180 Total HELOC - purchased ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 10,626 ​ ​ - ​ ​ - ​ ​ 10,626 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 8,659 ​ ​ 1,099 ​ ​ 437 ​ ​ 254 ​ ​ 1,414 ​ ​ 5,358 ​ ​ 7,206 ​ ​ - ​ ​ 24,427 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ 3 ​ ​ - ​ ​ 7 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 10 Total other ​ ​ 8,659 ​ ​ 1,102 ​ ​ 437 ​ ​ 261 ​ ​ 1,414 ​ ​ 5,358 ​ ​ 7,206 ​ ​ - ​ ​ 24,437 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 1,079,972 ​ ​ 607,575 ​ ​ 392,999 ​ ​ 267,763 ​ ​ 177,970 ​ ​ 225,968 ​ ​ 546,694 ​ ​ 30 ​ ​ 3,298,971 Special Mention ​ ​ 16,169 ​ ​ 2,222 ​ ​ 26,029 ​ ​ - ​ ​ - ​ ​ - ​ ​ 3,816 ​ ​ - ​ ​ 48,236 Substandard ​ ​ 21,090 ​ ​ 7,698 ​ ​ 19,098 ​ ​ 6,057 ​ ​ 5,738 ​ ​ 9,398 ​ ​ 5,662 ​ ​ - ​ ​ 74,741 Total loans ​ $ 1,117,231 ​ $ 617,495 ​ $ 438,126 ​ $ 273,820 ​ $ 183,708 ​ $ 235,366 ​ $ 556,172 ​ $ 30 ​ $ 3,421,948 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Credit quality indicators by loan class at December 31, 2020 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Converted ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Revolving ​ To Term ​ ​ ​ 2020 2019 2018 2017 2016 Prior Loans Loans Total Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 101,796 ​ $ 42,294 ​ $ 14,519 ​ $ 6,265 ​ $ 1,825 ​ $ 1,691 ​ $ 230,388 ​ $ - ​ $ 398,778 Special Mention ​ ​ 5,130 ​ ​ 425 ​ ​ 68 ​ ​ - ​ ​ 3 ​ ​ - ​ ​ 76 ​ ​ - ​ ​ 5,702 Substandard ​ ​ 273 ​ ​ 52 ​ ​ 1,524 ​ ​ - ​ ​ - ​ ​ - ​ ​ 830 ​ ​ - ​ ​ 2,679 Total commercial ​ ​ 107,199 ​ ​ 42,771 ​ ​ 16,111 ​ ​ 6,265 ​ ​ 1,828 ​ ​ 1,691 ​ ​ 231,294 ​ ​ - ​ ​ 407,159 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Leases ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 56,605 ​ ​ 52,168 ​ ​ 16,830 ​ ​ 6,545 ​ ​ 5,242 ​ ​ 651 ​ ​ - ​ ​ - ​ ​ 138,041 Special Mention ​ ​ 175 ​ ​ 163 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 338 Substandard ​ ​ - ​ ​ 1,434 ​ ​ 798 ​ ​ 59 ​ ​ 450 ​ ​ 481 ​ ​ - ​ ​ - ​ ​ 3,222 Total leases ​ ​ 56,780 ​ ​ 53,765 ​ ​ 17,628 ​ ​ 6,604 ​ ​ 5,692 ​ ​ 1,132 ​ ​ - ​ ​ - ​ ​ 141,601 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate - Investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 173,781 ​ ​ 158,677 ​ ​ 92,156 ​ ​ 66,762 ​ ​ 55,963 ​ ​ 15,966 ​ ​ 1,319 ​ ​ - ​ ​ 564,624 Special Mention ​ ​ 2,394 ​ ​ 9,592 ​ ​ 220 ​ ​ - ​ ​ 95 ​ ​ - ​ ​ - ​ ​ - ​ ​ 12,301 Substandard ​ ​ 2,709 ​ ​ 1,126 ​ ​ 71 ​ ​ - ​ ​ 340 ​ ​ 871 ​ ​ - ​ ​ - ​ ​ 5,117 Total commercial real estate - investor ​ ​ 178,884 ​ ​ 169,395 ​ ​ 92,447 ​ ​ 66,762 ​ ​ 56,398 ​ ​ 16,837 ​ ​ 1,319 ​ ​ - ​ ​ 582,042 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate - Owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 72,605 ​ ​ 52,809 ​ ​ 73,719 ​ ​ 45,315 ​ ​ 50,000 ​ ​ 25,507 ​ ​ 1,324 ​ ​ - ​ ​ 321,279 Special Mention ​ ​ 604 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 604 Substandard ​ ​ 1,564 ​ ​ 2,154 ​ ​ 1,780 ​ ​ 1,664 ​ ​ 501 ​ ​ 3,524 ​ ​ - ​ ​ - ​ ​ 11,187 Total commercial real estate - owner occupied ​ ​ 74,773 ​ ​ 54,963 ​ ​ 75,499 ​ ​ 46,979 ​ ​ 50,501 ​ ​ 29,031 ​ ​ 1,324 ​ ​ - ​ ​ 333,070 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 50,170 ​ ​ 24,163 ​ ​ 7,203 ​ ​ 539 ​ ​ 218 ​ ​ 1,261 ​ ​ 9,702 ​ ​ - ​ ​ 93,256 Special Mention ​ ​ 38 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 38 Substandard ​ ​ - ​ ​ 3,135 ​ ​ 2,057 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 5,192 Total construction ​ ​ 50,208 ​ ​ 27,298 ​ ​ 9,260 ​ ​ 539 ​ ​ 218 ​ ​ 1,261 ​ ​ 9,702 ​ ​ - ​ ​ 98,486 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate - Investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 9,371 ​ ​ 14,194 ​ ​ 8,522 ​ ​ 7,775 ​ ​ 2,431 ​ ​ 11,184 ​ ​ 1,144 ​ ​ - ​ ​ 54,621 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ 349 ​ ​ - ​ ​ 610 ​ ​ - ​ ​ 91 ​ ​ 466 ​ ​ - ​ ​ - ​ ​ 1,516 Total residential real estate - investor ​ ​ 9,720 ​ ​ 14,194 ​ ​ 9,132 ​ ​ 7,775 ​ ​ 2,522 ​ ​ 11,650 ​ ​ 1,144 ​ ​ - ​ ​ 56,137 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate - Owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 18,308 ​ ​ 23,450 ​ ​ 10,808 ​ ​ 15,409 ​ ​ 10,394 ​ ​ 31,325 ​ ​ 2,654 ​ ​ - ​ ​ 112,348 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ 47 ​ ​ - ​ ​ 412 ​ ​ 219 ​ ​ 526 ​ ​ 2,836 ​ ​ - ​ ​ - ​ ​ 4,040 Total residential real estate - owner occupied ​ ​ 18,355 ​ ​ 23,450 ​ ​ 11,220 ​ ​ 15,628 ​ ​ 10,920 ​ ​ 34,161 ​ ​ 2,654 ​ ​ - ​ ​ 116,388 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Multifamily ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 40,671 ​ ​ 30,849 ​ ​ 44,301 ​ ​ 38,133 ​ ​ 12,147 ​ ​ 7,735 ​ ​ 197 ​ ​ - ​ ​ 174,033 Special Mention ​ ​ - ​ ​ 6,901 ​ ​ - ​ ​ 548 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 7,449 Substandard ​ ​ 69 ​ ​ - ​ ​ 4,254 ​ ​ 927 ​ ​ 118 ​ ​ 2,190 ​ ​ - ​ ​ - ​ ​ 7,558 Total multifamily ​ ​ 40,740 ​ ​ 37,750 ​ ​ 48,555 ​ ​ 39,608 ​ ​ 12,265 ​ ​ 9,925 ​ ​ 197 ​ ​ - ​ ​ 189,040 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HELOC ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 2,511 ​ ​ 2,174 ​ ​ 1,679 ​ ​ 2,120 ​ ​ 504 ​ ​ 803 ​ ​ 69,483 ​ ​ - ​ ​ 79,274 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 94 ​ ​ - ​ ​ 94 Substandard ​ ​ - ​ ​ - ​ ​ 86 ​ ​ 37 ​ ​ 271 ​ ​ 91 ​ ​ 1,055 ​ ​ - ​ ​ 1,540 Total HELOC ​ ​ 2,511 ​ ​ 2,174 ​ ​ 1,765 ​ ​ 2,157 ​ ​ 775 ​ ​ 894 ​ ​ 70,632 ​ ​ - ​ ​ 80,908 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HELOC - Purchased ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 19,487 ​ ​ - ​ ​ - ​ ​ 19,487 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Total HELOC - purchased ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 19,487 ​ ​ - ​ ​ - ​ ​ 19,487 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 1,555 ​ ​ 574 ​ ​ 569 ​ ​ 229 ​ ​ 559 ​ ​ 341 ​ ​ 6,702 ​ ​ - ​ ​ 10,529 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ 4 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 4 Total other ​ ​ 1,555 ​ ​ 574 ​ ​ 573 ​ ​ 229 ​ ​ 559 ​ ​ 341 ​ ​ 6,702 ​ ​ - ​ ​ 10,533 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 527,373 ​ ​ 401,352 ​ ​ 270,306 ​ ​ 189,092 ​ ​ 139,283 ​ ​ 115,951 ​ ​ 322,913 ​ ​ - ​ ​ 1,966,270 Special Mention ​ ​ 8,341 ​ ​ 17,081 ​ ​ 288 ​ ​ 548 ​ ​ 98 ​ ​ - ​ ​ 170 ​ ​ - ​ ​ 26,526 Substandard ​ ​ 5,011 ​ ​ 7,901 ​ ​ 11,596 ​ ​ 2,906 ​ ​ 2,297 ​ ​ 10,459 ​ ​ 1,885 ​ ​ - ​ ​ 42,055 Total loans ​ $ 540,725 ​ $ 426,334 ​ $ 282,190 ​ $ 192,546 ​ $ 141,678 ​ $ 126,410 ​ $ 324,968 ​ $ - ​ $ 2,034,851 ​
Schedule of TDRs modified during the period by type of modification	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ TDR Modifications ​ TDR Modifications ​ ​ ​ Three Months Ended December 31, 2021 ​ Year Ended December 31, 2021 ​ ​ ​ # of ​ Pre-modification ​ Post-modification ​ # of ​ Pre-modification ​ Post-modification ​ ​ contracts recorded investment recorded investment contracts recorded investment recorded investment Troubled debt restructurings ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate - Owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HAMP 1 ​ - ​ $ - ​ $ - ​ - ​ $ - ​ $ - ​ Total ​ - ​ $ - ​ $ - ​ - ​ $ - ​ $ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ TDR Modifications ​ TDR Modifications ​ ​ ​ Three Months Ended December 31, 2020 ​ Year Ended December 31, 2020 ​ ​ ​ # of ​ Pre-modification ​ Post-modification ​ # of ​ Pre-modification ​ Post-modification ​ ​ contracts recorded investment recorded investment contracts recorded investment recorded investment Troubled debt restructurings ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate - Owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HAMP 1 ​ 1 ​ $ 154 ​ $ 153 ​ 3 ​ $ 410 ​ $ 395 ​ Total ​ 1 ​ $ 154 ​ $ 153 ​ 3 ​ $ 410 ​ $ 395 ​ ​ 1 HAMP: Home Affordable Modification Program ​
Schedule of loans to principal officers, directors, and their affiliates, made in the ordinary course of business	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 Beginning balance ​ $ 783 ​ $ 961 ​ New loans, including acquired related party loans ​ 11,836 ​ 644 ​ Repayments and other reductions ​ (2,457) ​ (822) ​ Change in related party status ​ - ​ - ​ Ending balance ​ $ 10,162 ​ $ 783 ​ ​ ​ ​ ​ ​ ​ ​ ​

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2021
Other Real Estate Owned
Schedule of activity in the other real estate owned (OREO) portfolio, net of valuation reserve	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended ​ ​ December 31, Other real estate owned 2021 2020 2019 ​ Balance at beginning of period ​ $ 2,474 ​ $ 5,004 ​ $ 7,175 ​ Property additions, net of acquisition adjustments ​ ​ 5,748 ​ ​ 898 ​ ​ 872 ​ Less: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Proceeds from property disposals, net of participation purchase and of gains/losses ​ ​ 5,787 ​ ​ 3,071 ​ ​ 2,515 ​ Period valuation (write-up)/write-down ​ ​ 79 ​ ​ 357 ​ ​ 519 ​ Other adjustments ​ ​ - ​ ​ - ​ ​ 9 ​ Balance at end of period ​ $ 2,356 ​ $ 2,474 ​ $ 5,004 ​
Schedule of activity in valuation allowance	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended ​ December 31, ​ 2021 2020 2019 Balance at beginning of period ​ $ 1,643 ​ $ 6,712 ​ $ 8,027 ​ Provision for unrealized losses ​ ​ 79 ​ ​ 357 ​ ​ 519 ​ Reductions taken on sales ​ ​ (543) ​ ​ (5,426) ​ ​ (1,834) ​ Balance at end of period ​ $ 1,179 ​ $ 1,643 ​ $ 6,712 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of expenses related to foreclosed assets, net of lease revenue	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended ​ ​ December 31, ​ ​ 2021 2020 2019 ​ (Gain) on sales, net ​ $ (41) ​ $ (204) ​ $ (264) ​ Provision for unrealized losses ​ ​ 79 ​ ​ 357 ​ ​ 519 ​ Operating expenses ​ ​ 133 ​ ​ 535 ​ ​ 173 ​ Less: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Lease revenue ​ ​ 4 ​ ​ 37 ​ ​ 5 ​ Net OREO expense ​ $ 167 ​ $ 651 ​ $ 423 ​

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2021
Premises and Equipment
Schedule of components of premises and equipment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 ​ ​ ​ ​ Accumulated ​ ​ ​ ​ Accumulated ​ ​ ​ ​ ​ ​ ​ Depreciation/ ​ Net Book ​ ​ ​ ​ Depreciation/ ​ Net Book ​ ​ ​ Cost ​ Amortization ​ Value ​ Cost ​ Amortization ​ Value ​ Land ​ $ 42,375 ​ $ - ​ $ 42,375 ​ $ 18,501 ​ $ - ​ $ 18,501 ​ ​ Buildings ​ 59,313 ​ 26,959 ​ 32,354 ​ 43,579 ​ 25,909 ​ 17,670 ​ ​ Leasehold improvements ​ 2,324 ​ 1,004 ​ 1,320 ​ 2,324 ​ 699 ​ 1,625 ​ ​ Furniture and equipment ​ 57,533 ​ 45,577 ​ 11,956 ​ 51,461 ​ 43,780 ​ 7,681 ​ ​ Total Premises and Equipment ​ $ 161,545 ​ $ 73,540 ​ $ 88,005 ​ $ 115,865 ​ $ 70,388 ​ $ 45,477 ​ ​

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2021
Deposits
Schedule of major classifications of deposits	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 Noninterest bearing demand ​ $ 1,428,055 ​ $ 909,505 ​ Savings ​ ​ 1,826,346 ​ ​ 399,057 ​ NOW accounts ​ ​ 605,056 ​ ​ 486,612 ​ Money market accounts ​ ​ 1,102,965 ​ ​ 316,465 ​ Certificates of deposit of less than $100,000 ​ ​ 287,238 ​ ​ 200,107 ​ Certificates of deposit of $100,000 through $250,000 ​ ​ 147,854 ​ ​ 164,982 ​ Certificates of deposit of more than $250,000 ​ ​ 68,718 ​ ​ 60,345 ​ Total deposits ​ $ 5,466,232 ​ $ 2,537,073 ​ ​ ​ ​ ​ ​ ​ ​ ​
Summary of scheduled maturities of time deposits	​ ​ ​ ​ ​ ​ 2022 $ 337,822 ​ 2023 ​ 78,697 ​ 2024 ​ 38,599 ​ 2025 ​ 30,858 ​ 2026 ​ 17,834 ​ Total time deposits ​ $ 503,810 ​

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2021
Borrowings
Summary of borrowings and junior subordinated debentures	The following table is a summary of borrowings as of December 31, 2021 and 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 Securities sold under repurchase agreements ​ $ 50,337 ​ $ 66,980 ​ Junior subordinated debentures 1 ​ ​ 25,773 ​ ​ 25,773 ​ Subordinated debentures ​ ​ 59,212 ​ ​ - ​ Senior notes ​ ​ 44,480 ​ ​ 44,375 ​ Notes payable and other borrowings ​ ​ 19,074 ​ ​ 23,393 ​ Total borrowings ​ $ 198,876 ​ $ 160,521 ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 See Note 10: Junior Subordinated Debentures, below.
Summary of scheduled maturities and weighted average rates of borrowings	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ Average ​ ​ ​ ​ Average ​ Balance Rate Balance Rate 2021 ​ $ - - ​ $ 70,980 ​ 0.46 % 2022 ​ ​ 58,337 ​ 0.37 % ​ 4,000 1.91 ​ 2023 ​ 9,000 1.85 ​ 9,000 1.91 ​ 2024 ​ - - ​ - ​ - ​ 2025 ​ - - ​ - - ​ 2026 ​ 46,554 5.88 ​ - - ​ Thereafter ​ 84,985 3.89 ​ 76,541 5.24 ​ Total borrowings ​ $ 198,876 3.23 % $ 160,521 2.86 %

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2021
Income Taxes
Schedule of components of income tax expense (benefit)	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 Current federal ​ $ 750 ​ $ 6,269 ​ $ 4,815 Current state ​ ​ 594 ​ ​ 3,960 ​ ​ 1,151 Deferred federal ​ ​ 4,445 ​ ​ (135) ​ ​ 3,177 Deferred state ​ ​ 2,034 ​ ​ (511) ​ ​ 3,259 Total income tax expenses ​ $ 7,823 ​ $ 9,583 ​ $ 12,402 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of components of deferred tax assets and liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 Allowance for credit losses ​ $ 15,601 ​ $ 11,058 Deferred compensation ​ ​ 1,378 ​ ​ 1,093 Goodwill amortization/impairment ​ ​ 980 ​ ​ 2,212 Stock based compensation ​ ​ 971 ​ ​ 1,356 Business combination adjustments ​ ​ 940 ​ ​ 255 OREO write-downs ​ ​ 573 ​ ​ 614 Federal recognized built-in loss ("RBIL") carryforward ​ ​ 493 ​ ​ 142 State net operating loss and RBIL carryforward ​ ​ - ​ ​ 60 Other assets ​ ​ 2,129 ​ ​ 2,182 Total deferred tax assets ​ ​ 23,065 ​ ​ 18,972 ​ ​ ​ ​ ​ ​ ​ Accumulated depreciation on premises and equipment ​ ​ (1,701) ​ ​ (1,237) Mortgage servicing rights ​ ​ (2,113) ​ ​ (1,261) Amortization of core deposit intangible ​ ​ (4,550) ​ ​ (171) State tax benefits ​ ​ (641) ​ ​ (930) Securities ​ ​ (2,620) ​ ​ - Other liabilities ​ ​ (1,931) ​ ​ (1,481) Total deferred tax liabilities ​ ​ (13,556) ​ ​ (5,080) Net deferred tax asset before adjustments related to other comprehensive income ​ ​ 9,509 ​ ​ 13,892 Tax effect of adjustments related to other comprehensive income ​ ​ (3,410) ​ ​ (5,771) Net deferred tax asset ​ $ 6,099 ​ $ 8,121 ​ ​ ​ ​ ​ ​ ​
Schedule of components of provision for deferred income taxes	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 Provision for credit losses $ (78) ​ $ (4,976) ​ $ (279) Deferred compensation ​ 1,388 ​ ​ (186) ​ ​ (242) Amortization of core deposit intangible ​ (18) ​ ​ 27 ​ ​ 14 Stock based compensation ​ 385 ​ ​ 266 ​ ​ (245) Business combination adjustments ​ 80 ​ ​ 1,292 ​ ​ 985 OREO write-downs ​ 1,543 ​ ​ 1,317 ​ ​ 406 Federal net operating loss and RBIL carryforward ​ (351) ​ ​ 198 ​ ​ 1,859 State net operating loss and RBIL carryforward ​ 60 ​ ​ 266 ​ ​ 3,708 Depreciation ​ (1,737) ​ ​ 491 ​ ​ 303 Mortgage servicing rights ​ 852 ​ ​ (518) ​ ​ (431) Goodwill amortization/impairment ​ 1,232 ​ ​ 1,244 ​ ​ 1,242 State tax benefits ​ (491) ​ ​ 3 ​ ​ (912) Securities ​ 4,188 ​ ​ - ​ ​ - Other, net ​ (574) ​ ​ (70) ​ ​ 28 Total deferred tax (benefit) expense $ 6,479 ​ $ (646) ​ $ 6,436 ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of difference between effective tax rates from federal statutory rates	Effective tax rates differ from federal statutory rates applied to financial statement income for the years ended December 31, due to the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 Tax at statutory federal income tax rate ​ $ 5,852 ​ $ 7,856 ​ $ 10,890 Nontaxable interest income, net of disallowed interest deduction ​ ​ (1,069) ​ ​ (1,067) ​ ​ (1,409) BOLI income ​ ​ (292) ​ ​ (271) ​ ​ (480) State income taxes, net of federal benefit ​ ​ 2,054 ​ ​ 2,570 ​ ​ 3,496 Stock based compensation ​ ​ 54 ​ ​ 297 ​ ​ (207) Transaction costs ​ ​ 396 ​ ​ - ​ ​ - Other, net ​ ​ 828 ​ ​ 198 ​ ​ 112 Total tax at effective tax rate ​ $ 7,823 ​ $ 9,583 ​ $ 12,402 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Equity Compensation Plans (Tabl

Equity Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2021
Equity Compensation Plans
Summary of stock option activity as of each year	A summary of stock option activity as of each year is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 ​ 2019 Intrinsic value of options exercised ​ $ - $ - $ 27 Cash received from option exercises ​ ​ - ​ - ​ 32 Tax benefit realized from option exercises ​ ​ - ​ - ​ 5 Weighted average fair value of options granted ​ ​ - ​ - ​ -
Summary of changes in nonvested shares of restricted share rights	​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ ​ ​ ​ Weighted ​ ​ Restricted ​ Average ​ ​ Stock Shares ​ Grant Date ​ and Units Fair Value Unvested at January 1 ​ 532,609 ​ $ 13.15 Granted ​ 274,881 ​ ​ 11.61 Vested ​ (199,492) ​ ​ 13.88 Forfeited ​ (67,692) ​ ​ 13.54 Unvested at December 31 ​ 540,306 ​ $ 12.42 ​ ​ ​ ​ ​ ​

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2021
Earnings Per Share
Schedule of Earnings Per Share	The earnings per share, both basic and diluted, are included below as of December 31, (in thousands except for per share data): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 Basic earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average common shares outstanding ​ ​ ​ 30,208,663 ​ ​ 29,623,333 ​ ​ 29,891,046 Net income ​ ​ $ 20,044 ​ $ 27,825 ​ $ 39,455 Basic earnings per share ​ ​ $ 0.66 ​ $ 0.94 ​ $ 1.32 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Diluted earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average common shares outstanding ​ ​ ​ 30,208,663 ​ ​ 29,623,333 ​ ​ 29,891,046 Dilutive effect of unvested restricted awards 1 ​ ​ ​ 529,199 ​ ​ 550,739 ​ ​ 525,302 Diluted average common shares outstanding ​ ​ ​ 30,737,862 ​ ​ 30,174,072 ​ ​ 30,416,348 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Income ​ ​ $ 20,044 ​ $ 27,825 ​ $ 39,455 Diluted earnings per share ​ ​ $ 0.65 ​ $ 0.92 ​ $ 1.30 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 Includes the common stock equivalents for restricted share rights that are dilutive . ​ ​ ​ ​ ​ ​ ​ ​ ​

Commitments (Tables)

Commitments (Tables)	12 Months Ended
	Dec. 31, 2021
Commitments
Schedule of contractual commitments due to letters of credit	The following table is a summary of financial instrument commitments as of December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ December 31, 2020 ​ ​ Fixed Variable Total Fixed Variable Total Letters of credit: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Borrower: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial standby ​ $ 384 ​ $ 17,474 ​ $ 17,858 ​ $ 329 ​ $ 9,051 ​ $ 9,380 ​ Commercial standby ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ Performance standby ​ ​ 456 ​ ​ 14,907 ​ ​ 15,363 ​ ​ 356 ​ ​ 4,517 ​ ​ 4,873 ​ ​ ​ ​ 840 ​ ​ 32,381 ​ ​ 33,221 ​ ​ 685 ​ ​ 13,568 ​ ​ 14,253 ​ Non-borrower: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Performance standby ​ ​ - ​ ​ 67 ​ ​ 67 ​ ​ - ​ ​ 67 ​ ​ 67 ​ Total letters of credit ​ $ 840 ​ $ 32,448 ​ $ 33,288 ​ $ 685 ​ $ 13,635 ​ $ 14,320 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unused loan commitments: ​ $ 84,225 ​ $ 895,665 ​ $ 979,890 ​ $ 88,883 ​ $ 316,298 ​ $ 405,181 ​
Schedule of aggregate minimum annual rental commitments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2027 ​ 2022 ​ 2023 ​ 2024 ​ 2025 ​ 2026 ​ and there after Rental commitment $ 864 ​ $ 792 ​ $ 771 ​ $ 738 ​ $ 662 ​ $ 2,635

Regulatory & Capital Matters (T

Regulatory & Capital Matters (Tables)	12 Months Ended
	Dec. 31, 2021
Regulatory & Capital Matters
Schedule of capital levels and industry defined regulatory minimum required levels	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Minimum Capital ​ Well Capitalized ​ ​ ​ ​ ​ ​ ​ ​ ​ Adequacy with Capital ​ Under Prompt Corrective ​ ​ ​ Actual ​ Conservation Buffer, if applicable 1 ​ Action Provisions 2 ​ ​ Amount Ratio Amount Ratio Amount Ratio ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 394,421 ​ 9.46 % ​ $ 291,855 ​ 7.00 % ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 514,992 ​ 12.41 ​ ​ ​ 290,487 ​ 7.00 ​ ​ $ 269,738 ​ 6.50 % Total capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 522,932 ​ 12.55 ​ ​ ​ 437,513 ​ 10.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 558,503 ​ 13.46 ​ ​ ​ 435,682 ​ 10.50 ​ ​ ​ 414,935 ​ 10.00 ​ Tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 419,421 ​ 10.06 ​ ​ ​ 354,382 ​ 8.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 514,992 ​ 12.41 ​ ​ ​ 352,734 ​ 8.50 ​ ​ ​ 331,985 ​ 8.00 ​ Tier 1 capital to average assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 419,421 ​ 7.81 ​ ​ ​ 214,812 ​ 4.00 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 514,992 ​ 9.58 ​ ​ ​ 215,028 ​ 4.00 ​ ​ ​ 268,785 ​ 5.00 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2020 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 277,199 ​ 11.94 % ​ $ 162,512 ​ 7.00 % ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 318,466 ​ 13.75 ​ ​ ​ 162,128 ​ 7.00 ​ ​ $ 150,548 ​ 6.50 % Total capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 331,178 ​ 14.26 ​ ​ ​ 243,855 ​ 10.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 347,408 ​ 15.00 ​ ​ ​ 243,186 ​ 10.50 ​ ​ ​ 231,605 ​ 10.00 ​ Tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 302,199 ​ 13.01 ​ ​ ​ 197,440 ​ 8.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 318,466 ​ 13.75 ​ ​ ​ 196,870 ​ 8.50 ​ ​ ​ 185,289 ​ 8.00 ​ Tier 1 capital to average assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 302,199 ​ 10.21 ​ ​ ​ 118,393 ​ 4.00 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 318,466 ​ 10.74 ​ ​ ​ 118,609 ​ 4.00 ​ ​ ​ 148,262 ​ 5.00 ​ ​ 1 Amounts are shown inclusive of a capital conservation buffer of 2.50%. 2 The prompt corrective action provisions are only applicable at the Bank level. The Bank exceeded the general minimum regulatory requirements to be considered “well capitalized.” ​

Mortgage Banking Derivatives (T

Mortgage Banking Derivatives (Tables)	12 Months Ended
	Dec. 31, 2021
Not Designated as Hedging Instrument [Member] | Mortgage Banking Derivatives.
Mortgage Banking Derivatives
Schedule of the effect of fair value and cash flow hedge accounting	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 Forward contracts: ​ ​ ​ ​ ​ ​ ​ Notional amount ​ $ 20,000 ​ $ 46,500 ​ Fair value ​ 17 ​ (228) ​ ​ ​ ​ ​ ​ ​ ​ ​ Rate lock commitments: ​ ​ ​ ​ ​ ​ ​ Notional amount ​ $ 14,414 ​ $ 37,972 ​ Fair value ​ 491 ​ 1,068 ​

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2021
Fair Value Measurements
Schedule of balance of assets and liabilities which are measured at fair value on a recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ Level 1 Level 2 Level 3 Total Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 202,339 ​ $ - ​ $ - ​ $ 202,339 U.S. government agencies ​ ​ - ​ ​ 61,888 ​ ​ - ​ ​ 61,888 U.S. government agencies mortgage-backed ​ ​ - ​ ​ 172,302 ​ ​ - ​ ​ 172,302 States and political subdivisions ​ ​ - ​ ​ 242,373 ​ ​ 14,092 ​ ​ 256,465 Corporate bonds ​ ​ - ​ ​ 9,887 ​ ​ - ​ ​ 9,887 Collateralized mortgage obligations ​ ​ - ​ ​ 672,967 ​ ​ - ​ ​ 672,967 Asset-backed securities ​ ​ - ​ ​ 236,877 ​ ​ - ​ ​ 236,877 Collateralized loan obligations ​ ​ - ​ ​ 79,763 ​ ​ - ​ ​ 79,763 Loans held-for-sale ​ ​ - ​ ​ 4,737 ​ ​ - ​ ​ 4,737 Mortgage servicing rights ​ ​ - ​ ​ - ​ ​ 7,097 ​ ​ 7,097 Interest rate swap agreements ​ ​ - ​ ​ 3,494 ​ ​ - ​ ​ 3,494 Mortgage banking derivatives ​ ​ - ​ ​ 508 ​ ​ - ​ ​ 508 Total ​ $ 202,339 ​ $ 1,484,796 ​ $ 21,189 ​ $ 1,708,324 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements, including risk participation agreements ​ $ - ​ $ 6,809 ​ $ - ​ $ 6,809 Total ​ $ - ​ $ 6,809 ​ $ - ​ $ 6,809 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ Level 1 Level 2 Level 3 Total Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 4,117 ​ $ - ​ $ - ​ $ 4,117 U.S. government agencies ​ ​ - ​ ​ 6,657 ​ ​ - ​ ​ 6,657 U.S. government agencies mortgage-backed ​ ​ - ​ ​ 17,209 ​ ​ - ​ ​ 17,209 States and political subdivisions ​ ​ - ​ ​ 244,940 ​ ​ 4,319 ​ ​ 249,259 Collateralized mortgage obligations ​ ​ - ​ ​ 56,585 ​ ​ - ​ ​ 56,585 Asset-backed securities ​ ​ - ​ ​ 131,818 ​ ​ - ​ ​ 131,818 Collateralized loan obligations ​ ​ - ​ ​ 30,533 ​ ​ - ​ ​ 30,533 Loans held-for-sale ​ ​ - ​ ​ 12,611 ​ ​ - ​ ​ 12,611 Mortgage servicing rights ​ ​ - ​ ​ - ​ ​ 4,224 ​ ​ 4,224 Interest rate swap agreements ​ ​ - ​ ​ 9,388 ​ ​ - ​ ​ 9,388 Mortgage banking derivatives ​ ​ - ​ ​ 840 ​ ​ - ​ ​ 840 Total ​ $ 4,117 ​ $ 510,581 ​ $ 8,543 ​ $ 523,241 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements, including risk participation agreements ​ $ - ​ $ 13,159 ​ $ - ​ $ 13,159 Total ​ $ - ​ $ 13,159 ​ $ - ​ $ 13,159
Schedule of changes in Level 3 assets and liabilities measured at fair value on a recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2021 ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ States and ​ Mortgage ​ ​ Political ​ Servicing ​ Subdivisions Rights Beginning balance January 1, 2021 ​ $ 4,319 ​ $ 4,224 Total gains or losses ​ ​ ​ ​ ​ ​ Included in earnings ​ ​ (20) ​ ​ 2,420 Included in other comprehensive income ​ ​ 801 ​ ​ - Purchases, issuances, sales, and settlements ​ ​ ​ ​ ​ ​ Purchases ​ ​ 9,919 ​ ​ - Issuances ​ ​ - ​ ​ 1,612 Settlements ​ ​ (927) ​ ​ (1,159) Ending balance December 31, 2021 ​ $ 14,092 ​ $ 7,097 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2020 ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ States and ​ Mortgage ​ ​ Political ​ Servicing ​ Subdivisions Rights Beginning balance January 1, 2020 ​ $ 5,419 ​ $ 5,935 Total gains or losses ​ ​ ​ ​ ​ ​ Included in earnings ​ ​ (20) ​ ​ (2,483) Included in other comprehensive income ​ ​ (628) ​ ​ - Purchases, issuances, sales, and settlements ​ ​ ​ ​ ​ ​ Purchases ​ ​ 13,086 ​ ​ - Issuances ​ ​ - ​ ​ 2,288 Settlements ​ ​ (13,538) ​ ​ (1,516) Ending balance December 31, 2020 ​ $ 4,319 ​ $ 4,224 ​ ​ ​ ​ ​ ​ ​
Schedule of quantitative information about level 3 fair value measurements	The following table and commentary presents quantitative and qualitative information about Level 3 fair value measurements as of December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted Measured at fair value ​ ​ ​ ​ ​ ​ Significant Unobservable ​ ​ ​ Average on a recurring basis: Fair Value Valuation Methodology Inputs Range of Input of Inputs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage servicing rights ​ $ 7,097 ​ Discounted Cash Flow ​ Discount Rate ​ 11.0 - 15.0% ​ 11.0 % ​ ​ ​ ​ ​ ​ ​ Prepayment Speed ​ 0.0 - 36.6% ​ 11.9 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table and commentary presents quantitative and qualitative information about Level 3 fair value measurements as of December 31, 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted Measured at fair value ​ ​ ​ ​ ​ ​ Significant Unobservable ​ ​ ​ Average on a recurring basis: Fair Value Valuation Methodology Inputs Range of Input of Inputs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage servicing rights ​ $ 4,224 ​ Discounted Cash Flow ​ Discount Rate ​ 11.0 - 15.0% ​ 11.0 % ​ ​ ​ ​ ​ ​ ​ Prepayment Speed ​ 5.5 - 59.1% ​ 19.5 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of assets measured at fair value on a nonrecurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ Level 1 Level 2 Level 3 Total Individually evaluated loans 1 ​ $ - ​ $ - ​ $ 13,138 ​ $ 13,138 Other real estate owned, net 2 ​ ​ - ​ ​ - ​ ​ 2,356 ​ ​ 2,356 Total ​ $ - ​ $ - ​ $ 15,494 ​ $ 15,494 ​ 1 Represents carrying value and related write-downs of loans for which adjustments are substantially based on the appraised value of collateral for collateral-dependent loans, had a carrying amount of $ 18.5 million and a valuation allowance of $5.4 million, resulting in an increase of specific allocations within the provision for credit losses of $ 2.7 for the year ending December 31, 2021. ​ 2 OREO is measured at the lower of carrying or fair value less costs to sell, and had a net carrying amount of $2.4 million, which is made up of the outstanding balance of $ 3.7 million, net of a valuation allowance of $ 1.2 million and purchase accounting adjustments of $131,000 at December 31, 2021. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ Level 1 Level 2 Level 3 Total Individually evaluated loans 1 ​ $ - ​ $ - ​ $ 9,675 ​ $ 9,675 Other real estate owned, net 2 ​ ​ - ​ ​ - ​ ​ 2,474 ​ ​ 2,474 Total ​ $ - ​ $ - ​ $ 12,149 ​ $ 12,149 ​ 1 Represents carrying value and related write-downs of loans for which adjustments are substantially based on the appraised value of collateral for collateral-dependent loans, had a carrying amount of $12.3 million and a valuation allowance of $2.6 million, resulting in an increase of specific allocations within the provision for loan and lease losses of $1.4 million for the year ending December 31, 2020. ​ 2 OREO is measured at the lower of carrying or fair value less costs to sell, and had a net carrying amount of $ 2.5 million, which is made up of the outstanding balance of $ 4.1 million, net of a valuation allowance of $ 1.6 million, at December 31, 2020.

Fair Values of Financial Inst_2

Fair Values of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2021
Fair Values of Financial Instruments
Schedule of carrying amount and estimated fair values of financial instruments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ ​ Carrying ​ Fair ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amount Value Level 1 Level 2 Level 3 Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and due from banks ​ $ 38,565 ​ $ 38,565 ​ $ 38,565 ​ $ - ​ $ - Interest earning deposits with financial institutions ​ ​ 713,542 ​ ​ 713,542 ​ ​ 713,542 ​ ​ - ​ ​ - Securities available-for-sale ​ ​ 1,692,488 ​ ​ 1,692,488 ​ ​ 202,339 ​ ​ 1,476,057 ​ ​ 14,092 FHLBC and FRBC stock ​ ​ 13,257 ​ ​ 13,257 ​ ​ - ​ ​ 13,257 ​ ​ - Loans held-for-sale ​ ​ 4,737 ​ ​ 4,737 ​ ​ - ​ ​ 4,737 ​ ​ - Net loans ​ ​ 3,377,667 ​ ​ 3,408,199 ​ ​ - ​ ​ - ​ ​ 3,408,199 Mortgage servicing rights ​ ​ 7,097 ​ ​ 7,097 ​ ​ - ​ ​ - ​ ​ 7,097 Interest rate swap agreements ​ ​ 3,494 ​ ​ 3,494 ​ ​ - ​ ​ 3,494 ​ ​ - Interest rate lock commitments and forward contracts ​ ​ 508 ​ ​ 508 ​ ​ - ​ ​ 508 ​ ​ - Interest receivable on securities and loans ​ ​ 13,431 ​ ​ 13,431 ​ ​ - ​ ​ 13,431 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Noninterest bearing deposits ​ $ 1,428,055 ​ $ 1,428,055 ​ $ 1,428,055 ​ $ - ​ $ - Interest bearing deposits ​ ​ 4,038,177 ​ ​ 4,041,369 ​ ​ - ​ ​ 4,041,369 ​ ​ - Securities sold under repurchase agreements ​ ​ 50,377 ​ ​ 50,377 ​ ​ - ​ ​ 50,377 ​ ​ - Junior subordinated debentures ​ ​ 25,773 ​ ​ 18,557 ​ ​ - ​ ​ 18,557 ​ ​ - Subordinated debentures ​ ​ 59,212 ​ ​ 60,111 ​ ​ ​ ​ ​ 60,111 ​ ​ ​ Senior notes ​ ​ 44,480 ​ ​ 44,480 ​ ​ 44,480 ​ ​ - ​ ​ - Note payable and other borrowings ​ ​ 19,074 ​ ​ 19,411 ​ ​ - ​ ​ 19,411 ​ ​ - Interest rate swap agreements ​ ​ 6,788 ​ ​ 6,788 ​ ​ - ​ ​ 6,788 ​ ​ - Interest payable on deposits and borrowings ​ ​ 1,706 ​ ​ 1,706 ​ ​ - ​ ​ 1,706 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ ​ Carrying ​ Fair ​ ​ ​ ​ ​ ​ ​ Amount Value Level 1 Level 2 Level 3 Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and due from banks ​ $ 24,306 ​ $ 24,306 ​ $ 24,306 ​ $ - ​ $ - Interest earning deposits with financial institutions ​ ​ 305,597 ​ ​ 305,597 ​ ​ 305,597 ​ ​ - ​ ​ - Securities available-for-sale ​ ​ 496,178 ​ ​ 496,178 ​ ​ 4,117 ​ ​ 487,742 ​ ​ 4,319 FHLBC and FRBC stock ​ ​ 9,917 ​ ​ 9,917 ​ ​ - ​ ​ 9,917 ​ ​ - Loans held-for-sale ​ ​ 12,611 ​ ​ 12,611 ​ ​ - ​ ​ 12,611 ​ ​ - Net loans ​ ​ 2,000,996 ​ ​ 2,009,773 ​ ​ - ​ ​ - ​ ​ 2,009,773 Mortgage servicing rights ​ ​ 4,224 ​ ​ 4,224 ​ ​ - ​ ​ - ​ ​ 4,224 Interest rate swap agreements ​ ​ 9,388 ​ ​ 9,388 ​ ​ - ​ ​ 9,388 ​ ​ - Interest rate lock commitments and forward contracts ​ ​ 840 ​ ​ 840 ​ ​ - ​ ​ 840 ​ ​ - Interest receivable on securities and loans ​ ​ 9,698 ​ ​ 9,698 ​ ​ - ​ ​ 9,698 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Noninterest bearing deposits ​ $ 909,505 ​ $ 909,505 ​ $ 909,505 ​ $ - ​ $ - Interest bearing deposits ​ ​ 1,627,568 ​ ​ 1,630,109 ​ ​ - ​ ​ 1,630,109 ​ ​ - Securities sold under repurchase agreements ​ ​ 66,980 ​ ​ 66,980 ​ ​ - ​ ​ 66,980 ​ ​ - Junior subordinated debentures ​ ​ 25,773 ​ ​ 14,658 ​ ​ - ​ ​ 14,658 ​ ​ - Senior notes ​ ​ 44,375 ​ ​ 44,600 ​ ​ 44,600 ​ ​ - ​ ​ - Note payable and other borrowings ​ ​ 23,393 ​ ​ 24,043 ​ ​ - ​ ​ 24,043 ​ ​ - Interest rate swap agreements ​ ​ 13,071 ​ ​ 13,071 ​ ​ - ​ ​ 13,071 ​ ​ - Interest payable on deposits and borrowings ​ ​ 418 ​ ​ 418 ​ ​ - ​ ​ 418 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Financial Instruments with Of_2

Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions (Tables)	12 Months Ended
	Dec. 31, 2021
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Schedule of fair value of derivative financial instruments as well as their classification on the Balance Sheet	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ No. of Trans. ​ Notional Amount $ ​ Balance Sheet Location Fair Value $ ​ Balance Sheet Location Fair Value $ Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements 2 ​ 75,774 ​ Other Assets 808 ​ Other Liabilities 4,102 Total derivatives designated as hedging instruments ​ ​ ​ ​ ​ 808 ​ ​ 4,102 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps with commercial loan customers 26 ​ 165,005 ​ Other Assets 2,686 ​ Other Liabilities 2,686 Interest rate lock commitments and forward contracts 87 ​ 34,414 ​ Other Assets 508 ​ Other Liabilities - Other contracts 3 ​ 17,173 ​ Other Assets - ​ Other Liabilities 21 Total derivatives not designated as hedging instruments ​ ​ ​ ​ ​ 3,194 ​ ​ 2,707 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2020 ​ No. of Trans. ​ Notional Amount $ ​ Balance Sheet Location Fair Value $ ​ Balance Sheet Location Fair Value $ Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements 2 ​ 75,774 ​ Other Assets 2,697 ​ Other Liabilities 6,380 Total derivatives designated as hedging instruments ​ ​ ​ ​ ​ 2,697 ​ ​ 6,380 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps with commercial loan customers 28 ​ 189,126 ​ Other Assets 6,691 ​ Other Liabilities 6,691 Interest rate lock commitments and forward contracts 205 ​ 84,472 ​ Other Assets 840 ​ Other Liabilities - Other contracts 4 ​ 26,523 ​ Other Assets - ​ Other Liabilities 88 Total derivatives not designated as hedging instruments ​ ​ ​ ​ ​ 7,531 ​ ​ 6,779

Parent Company Condensed Fina_2

Parent Company Condensed Financial Information (Tables)	12 Months Ended
	Dec. 31, 2020
Parent Company Condensed Financial Information
Schedule of condensed balance sheets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 Assets ​ ​ ​ ​ ​ ​ ​ Noninterest bearing deposit with bank subsidiary ​ $ 25,112 ​ $ 47,601 ​ Investment in subsidiaries ​ 626,325 ​ 353,722 ​ Other assets ​ 1,111 ​ 3,270 ​ Total assets ​ $ 652,548 ​ $ 404,593 ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities and Stockholders’ Equity ​ ​ ​ ​ ​ ​ ​ Junior subordinated debentures ​ $ 25,773 ​ $ 25,773 ​ Subordinated debt ​ 59,212 ​ - ​ Senior notes ​ ​ 44,480 ​ ​ 44,375 ​ Notes payable ​ ​ 13,000 ​ ​ 17,000 ​ Other liabilities ​ 8,056 ​ 10,358 ​ Stockholders’ equity ​ 502,027 ​ 307,087 ​ Total liabilities and stockholders' equity ​ $ 652,548 ​ $ 404,593 ​
Schedule of condensed statements of operations	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 Operating Income ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash dividends received from subsidiaries ​ $ 40,000 ​ $ 41,300 ​ $ 20,000 Other income ​ 15 ​ 32 ​ 109 Total operating income ​ 40,015 ​ 41,332 ​ 20,109 Operating Expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ Junior subordinated debentures ​ 1,133 ​ 2,216 ​ 3,724 Subordinated debt ​ ​ 1,610 ​ ​ - ​ ​ - Senior notes ​ ​ 2,692 ​ ​ 2,693 ​ ​ 2,700 Notes payable ​ 291 ​ 362 ​ - Other interest expense ​ - ​ - ​ 13 Other expenses ​ 6,918 ​ 3,669 ​ 4,025 Total operating expense ​ 12,644 ​ 8,940 ​ 10,462 Income before income taxes and equity in undistributed net income of subsidiaries ​ 27,371 ​ 32,392 ​ 9,647 Income tax benefit ​ (2,986) ​ (2,215) ​ (3,187) Income before equity in undistributed net income of subsidiaries ​ 30,357 ​ 34,607 ​ 12,834 Equity in undistributed net income of subsidiaries ​ (10,313) ​ (6,782) ​ 26,621 Net income available to common stockholders ​ $ 20,044 ​ $ 27,825 ​ $ 39,455
Schedule of condensed statements of cash Flows	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 Cash Flows from Operating Activities ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Income ​ $ 20,044 ​ $ 27,825 ​ $ 39,455 Adjustments to reconcile net income to net cash from operating activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Equity in undistributed net income of subsidiaries ​ 10,313 ​ 6,782 ​ (26,621) Provision for deferred tax expense (benefit) ​ (248) ​ (514) ​ 4,186 Change in taxes payable ​ (695) ​ 5,933 ​ 3,896 Change in other assets ​ (12) ​ 954 ​ - Stock-based compensation ​ 1,435 ​ 2,089 ​ 2,516 Other, net ​ 961 ​ 682 ​ (80) Net cash provided by (used in) operating activities ​ 31,798 ​ 43,751 ​ 23,352 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash Flows from Investing Activities ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash paid for acquisition, net of cash and cash equivalents retained ​ (94,406) ​ - ​ - Net cash used in investing activities ​ (94,406) ​ - ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash Flows from Financing Activities ​ ​ ​ ​ ​ ​ ​ ​ ​ Net change in other short-term borrowings ​ ​ - ​ ​ - ​ ​ (4,000) Dividend paid on common stock ​ ​ (4,612) ​ ​ (1,186) ​ ​ (1,195) Purchases of treasury stock ​ (10,417) ​ (5,922) ​ (666) Redemption of junior subordinated debentures ​ ​ - ​ ​ (32,604) ​ ​ - Issuance of term note ​ ​ - ​ ​ 20,000 ​ ​ - Issuance of sub debt ​ ​ 59,148 ​ ​ - ​ ​ - Repayment of term note ​ ​ (4,000) ​ ​ (3,000) ​ ​ - Proceeds from exercise of stock option ​ ​ - ​ ​ - ​ ​ 32 Net cash (used in) provided by financing activities ​ 40,119 ​ (22,712) ​ (5,829) Net change in cash and cash equivalents ​ (22,489) ​ 21,039 ​ 17,523 Cash and cash equivalents at beginning of year ​ 47,601 ​ 26,562 ​ 9,039 Cash and cash equivalents at end of year ​ $ 25,112 ​ $ 47,601 ​ $ 26,562 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2021USD ($)segmentitem	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Jan. 18, 2022$ / shares
Number of banking centres | item	63
Operating segment | segment	1
Reportable Segment | segment	1
Deferred tax assets	$ 23,065,000	$ 18,972,000
Retained earnings	$ 252,011,000	236,579,000
Period from due date after which accrual of interest income is discontinued	90 days
Goodwill and Core Deposit Intangible
Amortization of core deposit intangibles	$ 644,000	494,000	$ 539,000
Subsequent Events
Percentage of forfeiture assumption for group grant	5.00%
Core Deposits
Goodwill and Core Deposit Intangible
Carrying value of the intangible asset	$ 16,300,000
Amortization of core deposit intangibles	644,000	494,000	$ 539,000
Expected future annual amortization expense:
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2022	2,600,000
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2023	2,500,000
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2024	2,300,000
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2025	2,100,000
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2026	$ 1,800,000
GCFC/ABC Bank | Core Deposits
Goodwill and Core Deposit Intangible
Useful life (in years)	10 years
Remaining intangible asset		$ 2,200,000
West Suburban Bancorp, Inc | Core Deposits
Goodwill and Core Deposit Intangible
Intangible asset recorded	$ 14,800,000
Subsequent Event
Subsequent Events
Cash dividend declared (per share) | $ / shares				$ 0.05

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Premises and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Transfers and Servicing of Financial Assets
Mortgage loans serviced for others	$ 801.9	$ 793.5
Buildings | Minimum
Premises and equipment
Useful lives	25 years
Buildings | Maximum
Premises and equipment
Useful lives	40 years
Building Improvements | Minimum
Premises and equipment
Useful lives	3 years
Building Improvements | Maximum
Premises and equipment
Useful lives	15 years
Furniture and Fixtures | Minimum
Premises and equipment
Useful lives	3 years
Furniture and Fixtures | Maximum
Premises and equipment
Useful lives	10 years

Acquisitions (Details)

Acquisitions (Details) - USD ($)	Dec. 01, 2021	Dec. 31, 2021	Dec. 31, 2020
Liabilities assumed:
Goodwill		$ 86,332,000	$ 18,604,000
West Suburban Bancorp, Inc
Assets acquired:
Cash on due from banks		16,794,000
Interest bearing deposits with financial institutions		232,880,000
Securities available-for-sale, at fair value	$ 1,070,000,000	1,066,373,000
FHLBC stock		3,340,000
Loans	1,500,000,000	1,502,118,000
Premises and equipment		47,456,000
Other real estate owned		5,552,000
Core deposit intangible		14,772,000
Deferred tax assets, net		2,093,000
Other assets		52,710,000
Total assets	2,940,000,000	2,944,088,000
Liabilities assumed:
Deposits-noninterest bearing demand		409,141,000
Deposits - Savings, NOW and money market		2,069,890,000
Deposits-Time		215,205,000
Total deposits	2,690,000,000	2,694,236,000
Reserve for unfunded commitments		1,787,000
Other liabilities		20,629,000
Total liabilities		2,716,652,000
Cash consideration paid	100,700,000	100,679,000
Stock issued for acquisition		194,484,000
Total Liabilities Assumed and Cash Consideration Paid for Acquisition		3,011,815,000
Goodwill	$ 67,700,000	67,727,000
Shares issued or issuable	42.413
Cash consideration for each share	$ 271.15
Merger consideration	$ 295,200,000
Common stock shares issued	15,700,000
Measurement period	1 year
Expenses related to acquisition		13,200,000
Acquisition expenses		$ 25,100,000

Acquisition - Acquired PCD Loan

Acquisition - Acquired PCD Loans (Details) - West Suburban Bancorp, Inc - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 01, 2021
Business Acquisition [Line Items]
Purchase price of PCD loans at acquisition	$ 1,502,118	$ 1,500,000
PCI
Business Acquisition [Line Items]
Par value of acquired loans		108,241
Allowance for credit losses		(12,075)
Non-credit discount		(1,723)
Purchase price of PCD loans at acquisition		$ 94,443

Acquisition - Unaudited Pro For

Acquisition - Unaudited Pro Forma (Details) - West Suburban Bancorp, Inc - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Net interest income	$ 166,495	$ 165,283
Noninterest income	59,036	48,937
Net income attributable to Old Second Bancorp, Inc.	$ 67,779	$ 12,349

Cash and Due from Banks (Detail

Cash and Due from Banks (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Other disclosures
Cash and cash equivalents	$ 752,107,000	$ 329,903,000
Federal Reserve Bank Regulatory Reserve [Member]
Other disclosures
Average Reserve Balance With Reserve Bank	$ 0	$ 0

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)item	Dec. 31, 2020USD ($)
Securities Available-for-Sale
Amortized Cost	$ 1,677,016	$ 471,961
Gross Unrealized Gains	20,587	26,735
Gross Unrealized Losses	(5,115)	(2,518)
Debt Securities, Available-for-sale, Total	1,692,488	496,178
Accrued interest receivable	4,300	2,700
FHLB and FRB Stock
FHLBC stock	7,100	3,700
FRB stock	6,200	6,200
Securities pledged to secure deposits and for other purposes	501,300	335,800
Other disclosures
Debt Securities, Available-for-sale, Total	$ 1,692,488	496,178
Number of securities issued from originators	0
Number of originators | item	1
Minimum percentage of securities investment	10.00%
Reimbursement requests greater than 5 %
Other disclosures
Percentage of outstanding principal amount of loans guaranteed by US Department of Education	85
Percent of insured loan	5
Reimbursement requests greater than 9 %
Other disclosures
Percentage of outstanding principal amount of loans guaranteed by US Department of Education	75
Percent of insured loan	9
US Treasury Securities
Securities Available-for-Sale
Amortized Cost	$ 202,251	4,014
Gross Unrealized Gains	125	103
Gross Unrealized Losses	(37)
Debt Securities, Available-for-sale, Total	202,339	4,117
Other disclosures
Debt Securities, Available-for-sale, Total	202,339	4,117
US Government Corporations and Agencies Securities
Securities Available-for-Sale
Amortized Cost	62,587	6,811
Gross Unrealized Losses	(699)	(154)
Debt Securities, Available-for-sale, Total	61,888	6,657
Other disclosures
Debt Securities, Available-for-sale, Total	61,888	6,657
U.S. government agencies mortgage-backed
Securities Available-for-Sale
Amortized Cost	172,016	16,098
Gross Unrealized Gains	856	1,112
Gross Unrealized Losses	(570)	(1)
Debt Securities, Available-for-sale, Total	172,302	17,209
Other disclosures
Debt Securities, Available-for-sale, Total	172,302	17,209
States and political subdivisions
Securities Available-for-Sale
Amortized Cost	240,793	229,352
Gross Unrealized Gains	16,344	21,269
Gross Unrealized Losses	(672)	(1,362)
Debt Securities, Available-for-sale, Total	256,465	249,259
Other disclosures
Debt Securities, Available-for-sale, Total	256,465	249,259
Corporate bonds
Securities Available-for-Sale
Amortized Cost	10,000
Gross Unrealized Losses	(113)
Debt Securities, Available-for-sale, Total	9,887
Other disclosures
Debt Securities, Available-for-sale, Total	9,887
Collateralized loan obligations
Securities Available-for-Sale
Amortized Cost	673,238	53,999
Gross Unrealized Gains	2,014	2,866
Gross Unrealized Losses	(2,285)	(280)
Debt Securities, Available-for-sale, Total	672,967	56,585
Other disclosures
Debt Securities, Available-for-sale, Total	672,967	56,585
Asset-backed Securities
Securities Available-for-Sale
Amortized Cost	236,293	130,959
Gross Unrealized Gains	1,245	1,370
Gross Unrealized Losses	(661)	(511)
Debt Securities, Available-for-sale, Total	236,877	131,818
Other disclosures
Debt Securities, Available-for-sale, Total	236,877	131,818
FFEL
Securities Available-for-Sale
Debt Securities, Available-for-sale, Total	194,400
Other disclosures
Debt Securities, Available-for-sale, Total	$ 194,400
Percentage of outstanding principal amount of loans guaranteed by US Department of Education	97
Collateralized loan obligations.
Securities Available-for-Sale
Amortized Cost	$ 79,838	30,728
Gross Unrealized Gains	3	15
Gross Unrealized Losses	(78)	(210)
Debt Securities, Available-for-sale, Total	79,763	30,533
Other disclosures
Debt Securities, Available-for-sale, Total	$ 79,763	$ 30,533
Loan receivables | GCO Education Loan Funding Corp | Customer Concentration Risk
Other disclosures
Percentage of concentration risk	1.00%

Securities - Contractual Maturi

Securities - Contractual Maturities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Securities Available-for-Sale, Amortized Cost
Due in one year or less	$ 8,671
Due after one year through five years	274,984
Due after five years through ten years	43,770
Due after ten years	188,206
Debt securities excluding securities not due at a single maturity date	515,631
Total	$ 1,677,016	$ 471,961
Securities Available-for-Sale, Weighted Average Yield
Due in one year or less (as a percent)	1.24%
Due after one year through five years (as a percent)	0.89%
Due after five years through ten years (as a percent)	2.43%
Due after ten years (as a percent)	2.98%
Debt securities (as a percent)	1.79%
Total (as a percent)	1.38%
Securities Available-for-Sale, Fair Value
Due in one year or less	$ 8,707
Due after one year through five years	274,537
Due after five years through ten years	45,470
Due after ten years	201,865
Debt securities	530,579
Debt Securities, Available-for-sale, Total	1,692,488	496,178
Collateralized loan obligations
Securities Available-for-Sale, Amortized Cost
Total	673,238	53,999
Securities Available-for-Sale, Fair Value
Debt Securities, Available-for-sale, Total	672,967	56,585
Asset-backed Securities
Securities Available-for-Sale, Amortized Cost
Securities not due at a single maturity date	236,293
Total	$ 236,293	130,959
Securities Available-for-Sale, Weighted Average Yield
Securities not due at a single maturity date, Weighted Average Yield (as a percent)	1.12%
Securities Available-for-Sale, Fair Value
Securities not due at a single maturity date	$ 236,877
Debt Securities, Available-for-sale, Total	236,877	131,818
Collateralized loan obligations.
Securities Available-for-Sale, Amortized Cost
Securities not due at a single maturity date	79,838
Total	$ 79,838	30,728
Securities Available-for-Sale, Weighted Average Yield
Securities not due at a single maturity date, Weighted Average Yield (as a percent)	1.60%
Securities Available-for-Sale, Fair Value
Securities not due at a single maturity date	$ 79,763
Debt Securities, Available-for-sale, Total	79,763	$ 30,533
Mortgage-backed and collateralized mortgage obligations
Securities Available-for-Sale, Amortized Cost
Securities not due at a single maturity date	$ 845,254
Securities Available-for-Sale, Weighted Average Yield
Securities not due at a single maturity date, Weighted Average Yield (as a percent)	1.19%
Securities Available-for-Sale, Fair Value
Securities not due at a single maturity date	$ 845,269

Securities - Unrealized Loss Po

Securities - Unrealized Loss Positions (Details)	Dec. 31, 2021USD ($)security	Dec. 31, 2020USD ($)
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position	241	7
Greater than 12 months in an unrealized loss position	11	13
Total	252	20
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 4,230,000	$ 313,000
Greater than 12 months in an unrealized loss position	885,000	2,205,000
Total	5,115,000	2,518,000
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	734,235,000	16,002,000
Greater than 12 months in an unrealized loss position	24,626,000	81,285,000
Total	$ 758,861,000	$ 97,287,000
US Treasury Securities
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security	1
Total | security	1
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 37,000
Total	37,000
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	49,719,000
Total	$ 49,719,000
US Government Corporations and Agencies Securities
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security	5
Greater than 12 months in an unrealized loss position	4	4
Total	9	4
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 592,000
Greater than 12 months in an unrealized loss position	107,000	$ 154,000
Total	699,000	154,000
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	56,879,000
Greater than 12 months in an unrealized loss position	5,008,000	6,657,000
Total	$ 61,887,000	$ 6,657,000
Mortgage Backed Securities, Issued by US Government Agencies
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position	63	1
Greater than 12 months in an unrealized loss position | security	1
Total	64	1
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 505,000	$ 1,000
Greater than 12 months in an unrealized loss position	65,000
Total	570,000	1,000
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	78,711,000	141,000
Greater than 12 months in an unrealized loss position	1,663,000
Total	$ 80,374,000	$ 141,000
States and political subdivisions
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security	7
Greater than 12 months in an unrealized loss position	1	1
Total	8	1
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 55,000
Greater than 12 months in an unrealized loss position	617,000	$ 1,362,000
Total	672,000	1,362,000
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	8,430,000
Greater than 12 months in an unrealized loss position	4,051,000	3,433,000
Total	$ 12,481,000	$ 3,433,000
Corporate bonds
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security	2
Total | security	2
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 113,000
Total	113,000
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	9,887,000
Total	$ 9,887,000
Collateralized loan obligations
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position	133	4
Greater than 12 months in an unrealized loss position		1
Total	133	5
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 2,285,000	$ 279,000
Greater than 12 months in an unrealized loss position		1,000
Total	2,285,000	280,000
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	381,658,000	8,142,000
Greater than 12 months in an unrealized loss position		146,000
Total	$ 381,658,000	$ 8,288,000
Asset-backed Securities
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position	20	1
Greater than 12 months in an unrealized loss position	3	3
Total	23	4
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 608,000	$ 2,000
Greater than 12 months in an unrealized loss position	53,000	509,000
Total	661,000	511,000
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	103,819,000	251,000
Greater than 12 months in an unrealized loss position	3,276,000	49,572,000
Total	$ 107,095,000	$ 49,823,000
Collateralized loan obligations.
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position	10	1
Greater than 12 months in an unrealized loss position	2	4
Total	12	5
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 35,000	$ 31,000
Greater than 12 months in an unrealized loss position	43,000	179,000
Total	78,000	210,000
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	45,132,000	7,468,000
Greater than 12 months in an unrealized loss position	10,628,000	21,477,000
Total	$ 55,760,000	$ 28,945,000

Securities - Realized Gain (Los

Securities - Realized Gain (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Securities
Proceeds from sales of securities	$ 605,846	$ 18,006	$ 191,298
Gross realized gains on securities	270	17	5,521
Gross realized losses on securities	(38)	(42)	(1,010)
Net realized gains (losses)	232	(25)	4,511
Income tax (expense) benefit on net realized gains (losses)	$ (65)	$ 7	$ (1,267)
Effective tax rate applied (as a percent)	28.00%	28.00%	28.10%

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses on Loans - Major Classifications (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Loans
Total loans, excluding deferred loan costs and PCI loans	$ 3,421,948	$ 2,034,851
Total Loans	3,421,948	2,034,851
Allowance for credit losses	(44,281)	(33,855)
Net loans	3,377,667	2,000,996
Loans and leases receivable, accrued interest receivable	9,200	7,000
Paycheck Protection Program (PPP)
Loans
Total Loans	38,400	74,100
Collateral
Loans
Allowance for credit losses	(5,387)	(2,637)
Commercial
Loans
Total loans, excluding deferred loan costs and PCI loans	771,474	407,159
Total Loans	771,474	407,159
Commercial | Collateral
Loans
Allowance for credit losses	(2,677)	(56)
Leases
Loans
Total loans, excluding deferred loan costs and PCI loans	176,031	141,601
Total Loans	176,031	141,601
Leases | Collateral
Loans
Allowance for credit losses	(811)	(880)
Commercial real estate - Investor
Loans
Total loans, excluding deferred loan costs and PCI loans	957,389	582,042
Total Loans	957,389	582,042
Commercial real estate - Investor | Collateral
Loans
Allowance for credit losses		(84)
Commercial real estate - Owner occupied
Loans
Total loans, excluding deferred loan costs and PCI loans	574,384	333,070
Total Loans	574,384	333,070
Commercial real estate - Owner occupied | Collateral
Loans
Allowance for credit losses	(362)	(195)
Construction
Loans
Total loans, excluding deferred loan costs and PCI loans	206,132	98,486
Total Loans	206,132	98,486
Construction | Collateral
Loans
Allowance for credit losses	(992)	(952)
Residential real estate - Investor
Loans
Total loans, excluding deferred loan costs and PCI loans	63,399	56,137
Total Loans	63,399	56,137
Residential real estate - Owner occupied
Loans
Total loans, excluding deferred loan costs and PCI loans	213,248	116,388
Total Loans	213,248	116,388
Residential real estate - Owner occupied | Collateral
Loans
Allowance for credit losses	(276)	(10)
Multifamily
Loans
Total loans, excluding deferred loan costs and PCI loans	309,164	189,040
Total Loans	309,164	189,040
Multifamily | Collateral
Loans
Allowance for credit losses	(75)	(378)
HELOC
Loans
Total loans, excluding deferred loan costs and PCI loans	115,664	80,908
Total Loans	115,664	80,908
HELOC | Collateral
Loans
Allowance for credit losses	(190)	(78)
HELOC - Purchased
Loans
Total loans, excluding deferred loan costs and PCI loans	10,626	19,487
Total Loans	10,626	19,487
Others
Loans
Total loans, excluding deferred loan costs and PCI loans	$ 24,437	10,533
Other 1
Loans
Total Loans		$ 2,034,851

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses on Loans - Major Classifications - Loan Concentrations (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Real estate | Loan receivables | Customer Concentration Risk
Loans
Loans receivable as a percentage of total portfolio	71.60%	72.50%

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses on Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for loan losses:
Beginning Balance	$ 33,855	$ 19,789
Impact of WSB Acquisition with PCD Loans	12,075
Provision for (Release of) Credit Losses	2,795	9,166	$ 1,600	$ 19,006
Charge-offs	5,933	3,068	2,051
Recoveries	1,489	2,089	1,234
Ending Balance	44,281	33,855	19,789
Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	5,879
Ending Balance		5,879
Commercial
Allowance for loan losses:
Beginning Balance	2,812	3,015
Impact of WSB Acquisition with PCD Loans	7,161
Provision for (Release of) Credit Losses	2,389	72	218	2,832
Charge-offs	963	39	109
Recoveries	352	56	74
Ending Balance	11,751	2,812	3,015
Commercial | Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	(292)
Ending Balance		(292)
Leases
Allowance for loan losses:
Beginning Balance	3,888	1,262
Provision for (Release of) Credit Losses	(339)	2,233	577	734
Charge-offs	69	206	49
Recoveries		98
Ending Balance	3,480	3,888	1,262
Leases | Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	501
Ending Balance		501
Commercial real estate - Investor
Allowance for loan losses:
Beginning Balance	9,205	6,218
Impact of WSB Acquisition with PCD Loans	1,877
Provision for (Release of) Credit Losses	4,657	4,075	(497)	6,339
Charge-offs	2,724	512	303
Recoveries	78	165	679
Ending Balance	13,093	9,205	6,218
Commercial real estate - Investor | Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	(741)
Ending Balance		(741)
Commercial real estate - Owner occupied
Allowance for loan losses:
Beginning Balance	2,251	3,678
Impact of WSB Acquisition with PCD Loans	2,771
Provision for (Release of) Credit Losses	(845)	487	874	3,515
Charge-offs	1,797	1,763	716
Recoveries	235	697	5
Ending Balance	2,615	2,251	3,678
Commercial real estate - Owner occupied | Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	(848)
Ending Balance		(848)
Real estate - construction
Allowance for loan losses:
Beginning Balance	4,054	513
Impact of WSB Acquisition with PCD Loans	102
Provision for (Release of) Credit Losses	(783)	2,095	(448)	969
Charge-offs		60	9
Recoveries		172	1
Ending Balance	3,373	4,054	513
Real estate - construction | Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	1,334
Ending Balance		1,334
Residential real estate - Investor
Allowance for loan losses:
Beginning Balance	1,740	601
Impact of WSB Acquisition with PCD Loans	23
Provision for (Release of) Credit Losses	(1,294)	350	43	554
Charge-offs		8	7
Recoveries	291	57	11
Ending Balance	760	1,740	601
Residential real estate - Investor | Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	740
Ending Balance		740
Residential real estate - Owner occupied
Allowance for loan losses:
Beginning Balance	2,714	1,257
Impact of WSB Acquisition with PCD Loans	136
Provision for (Release of) Credit Losses	(176)	(107)	(86)	1,377
Charge-offs		43	111
Recoveries	158	287	77
Ending Balance	2,832	2,714	1,257
Residential real estate - Owner occupied | Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	1,320
Ending Balance		1,320
Multifamily
Allowance for loan losses:
Beginning Balance	3,625	1,444
Provision for (Release of) Credit Losses	233	449	813	616
Charge-offs	183
Recoveries			15
Ending Balance	3,675	3,625	1,444
Multifamily | Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	1,732
Ending Balance		1,732
HELOC
Allowance for loan losses:
Beginning Balance	1,749	1,161
Impact of WSB Acquisition with PCD Loans	5
Provision for (Release of) Credit Losses	408	(1,198)	(351)	1,449
Charge-offs	17	127	109
Recoveries	234	387	172
Ending Balance	2,379	1,749	1,161
HELOC | Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	1,526
Ending Balance		1,526
HELOC - Purchased
Allowance for loan losses:
Beginning Balance	199
Provision for (Release of) Credit Losses	(68)	265	229
Charge-offs		66	229
Ending Balance	131	199
Other
Allowance for loan losses:
Beginning Balance	1,618	640
Provision for (Release of) Credit Losses	(1,387)	445	228	$ 621
Charge-offs	180	244	409
Recoveries	141	170	200
Ending Balance	192	1,618	$ 640
Other | Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	$ 607
Ending Balance		$ 607

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses on Loans - Collateral dependent loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	$ 43,129	$ 29,253
ACL Allocation	44,281	33,855
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	26,977	25,150
Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	9,901	1,070
Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	3,249	2,377
Other.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	3,002	656
Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	5,387	2,637
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	11,887	1,125
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,986
Commercial | Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	9,901	1,070
Commercial | Other.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral		55
Commercial | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	2,677	56
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	3,754	2,974
Leases | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	3,249	2,377
Leases | Other.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	505	597
Leases | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	811	880
Commercial real estate - Investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	5,693	4,179
Commercial real estate - Investor | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	5,693	4,179
Commercial real estate - Investor | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation		84
Commercial real estate - Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	11,637	9,726
Commercial real estate - Owner occupied | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	9,147	9,726
Commercial real estate - Owner occupied | Other.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	2,490
Commercial real estate - Owner occupied | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	362	195
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	2,104	1,891
Construction | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	2,104	1,891
Construction | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	992	952
Residential real estate - Investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	925	928
Residential real estate - Investor | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	925	928
Residential real estate - Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	4,271	3,535
Residential real estate - Owner occupied | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	4,271	3,535
Residential real estate - Owner occupied | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	276	10
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,845	3,838
Multifamily | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,845	3,838
Multifamily | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	75	378
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	826	1,053
HELOC | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	826	1,053
HELOC | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	190	78
HELOC - Purchased
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	180
HELOC - Purchased | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	180
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	7	4
Other | Other.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	7	4
Other | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	$ 4	$ 4

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses on Loans - Aging Analysis (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)item	Dec. 31, 2020USD ($)item
Aged analysis of past due loans
Nonaccrual	$ 41,531	$ 22,280
Non accrual including PCI Loans		2,034,851
Total Loans	3,421,948	2,034,851
Total loans, including deferred loan loan costs and PCI	3,377,667	2,000,996
Recorded Investment 90 days or Greater Past Due and Accruing	$ 3,110
Total Loans		$ 434
Number of loan modifications, CARES Act | item	509	509
Number of loan modifications with deferral request, CARES Act | item	7
Number of loan modifications resumed payments, CARES Act | item	502
Number of loan modifications in non accrual status, CARES Act | item	6
Pre-modification, CARES Act	$ 242,700	$ 242,700
Post-modification, CARES Act	7,800
Loan modification CARES Act, resumed payments	234,900
Total non accrual loans	7,700
Special Mention [Member]
Aged analysis of past due loans
Total Loans	48,236
Financial Asset, Past Due [Member]
Aged analysis of past due loans
Total Past Due Including PCI loans	27,342	22,948
30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due Including PCI loans	9,342	10,916
60 to 89 Days Past Due
Aged analysis of past due loans
Current	4,356
Total Past Due Including PCI loans		1,840
90 Days or Greater Past Due
Aged analysis of past due loans
Current	13,644
Total Past Due Including PCI loans		10,192
Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	3,394,606
Current including PCI Loans		2,011,903
Commercial
Aged analysis of past due loans
Nonaccrual	11,894	1,125
Total Loans	771,474	407,159
Recorded Investment 90 days or Greater Past Due and Accruing	1,396
Commercial | Special Mention [Member]
Aged analysis of past due loans
Total Loans	4,530	5,702
Commercial | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	6,648	52
Commercial | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	3,407
Commercial | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	1,413
Commercial | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	1,828	52
Commercial | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	764,826	407,107
Leases
Aged analysis of past due loans
Nonaccrual	3,754	2,638
Total Loans	176,031	141,601
Recorded Investment 90 days or Greater Past Due and Accruing		163
Leases | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	1,696	988
Leases | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	125	613
Leases | 60 to 89 Days Past Due
Aged analysis of past due loans
Current		59
Leases | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	1,571	316
Leases | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	174,335	140,613
Leases | Non-PCI | Special Mention [Member]
Aged analysis of past due loans
Total Loans		338
Commercial real estate - Investor
Aged analysis of past due loans
Nonaccrual	5,694	1,632
Total Loans	957,389	582,042
Commercial real estate - Investor | Special Mention [Member]
Aged analysis of past due loans
Total Loans	26,016	12,301
Commercial real estate - Investor | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	1,374	2,547
Commercial real estate - Investor | 30 to 59 Days Past Due
Aged analysis of past due loans
Current		1,439
Commercial real estate - Investor | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	267
Commercial real estate - Investor | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	1,107	1,108
Commercial real estate - Investor | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	956,015	579,495
Commercial real estate - Owner occupied
Aged analysis of past due loans
Nonaccrual	11,637	9,262
Total Loans	574,384	333,070
Recorded Investment 90 days or Greater Past Due and Accruing	1,594
Commercial real estate - Owner occupied | Special Mention [Member]
Aged analysis of past due loans
Total Loans	2,953	604
Commercial real estate - Owner occupied | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	7,672	10,115
Commercial real estate - Owner occupied | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	2,324	1,848
Commercial real estate - Owner occupied | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	500	958
Commercial real estate - Owner occupied | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	4,848	7,309
Commercial real estate - Owner occupied | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	566,712	322,955
Real estate - construction
Aged analysis of past due loans
Nonaccrual	160
Total Loans	206,132	98,486
Real estate - construction | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	854	1,237
Real estate - construction | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	854	1,237
Real estate - construction | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	205,278	97,249
Residential real estate - Investor
Aged analysis of past due loans
Nonaccrual	876	928
Total Loans	63,399	56,137
Recorded Investment 90 days or Greater Past Due and Accruing	23	157
Residential real estate - Investor | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	1,657	1,526
Residential real estate - Investor | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	395	1,022
Residential real estate - Investor | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	470	20
Residential real estate - Investor | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	792	484
Residential real estate - Investor | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	61,742	54,611
Residential real estate - Owner occupied
Aged analysis of past due loans
Nonaccrual	4,898	3,206
Total Loans	213,248	116,388
Recorded Investment 90 days or Greater Past Due and Accruing	97	114
Residential real estate - Owner occupied | Special Mention [Member]
Aged analysis of past due loans
Total Loans	659
Residential real estate - Owner occupied | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	5,662	1,862
Residential real estate - Owner occupied | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	1,994	859
Residential real estate - Owner occupied | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	591	286
Residential real estate - Owner occupied | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	3,077	717
Residential real estate - Owner occupied | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	207,586	114,526
Multifamily
Aged analysis of past due loans
Nonaccrual	1,573	2,437
Total Loans	309,164	189,040
Multifamily | Special Mention [Member]
Aged analysis of past due loans
Total Loans	6,900	7,449
Multifamily | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	1,046	3,749
Multifamily | 30 to 59 Days Past Due
Aged analysis of past due loans
Current		3,282
Multifamily | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	1,046	467
Multifamily | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	308,118	185,291
HELOC
Aged analysis of past due loans
Nonaccrual	862	1,052
Total Loans	115,664	80,908
HELOC | Special Mention [Member]
Aged analysis of past due loans
Total Loans	108	94
HELOC | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	434	805
HELOC | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	193	549
HELOC | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	23	50
HELOC | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	218	206
HELOC | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	115,230	80,103
HELOC - Purchased
Aged analysis of past due loans
Nonaccrual	180
Total Loans	10,626	19,487
HELOC - Purchased | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	180	47
HELOC - Purchased | 30 to 59 Days Past Due
Aged analysis of past due loans
Current		47
HELOC - Purchased | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	180
HELOC - Purchased | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	10,446	19,440
Other
Aged analysis of past due loans
Total Loans	24,437	10,533
Other | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	119	20
Other | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	50	20
Other | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	46
Other | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	23
Other | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	24,318	10,513
Other 1
Aged analysis of past due loans
Nonaccrual	$ 3
Total Loans		2,034,851
Other 1 | Special Mention [Member]
Aged analysis of past due loans
Total Loans		$ 26,526

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses on Loans - Nonaccruals (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 41,531	$ 22,280
Non accrual including PCI Loans		2,034,851
Nonaccrual with no ACL	37,145	17,207
Interest on nonaccrual loans	280,000
Accrued interest reversed against interest income	237,000
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	11,894	1,125
Nonaccrual with no ACL	9,217	1,070
Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	3,754	2,638
Nonaccrual with no ACL	2,943	309
Commercial real estate - Investor
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	5,694	1,632
Nonaccrual with no ACL	5,694	1,632
Commercial real estate - Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	11,637	9,262
Nonaccrual with no ACL	11,205	6,780
Real estate - construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	160
Nonaccrual with no ACL	160
Residential real estate - Investor
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	876	928
Nonaccrual with no ACL	876	928
Residential real estate - Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	4,898	3,206
Nonaccrual with no ACL	4,622	3,206
Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,573	2,437
Nonaccrual with no ACL	1,573	2,437
HELOC
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	862	1,052
Nonaccrual with no ACL	672	$ 845
HELOC - Purchased
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	180
Nonaccrual with no ACL	180
Other 1
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	3
Nonaccrual with no ACL	$ 3

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses on Loans - Credit Quality (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Loans by risk rating
2021	$ 1,117,231,000
2020	617,495,000
2019	438,126,000
2018	273,820,000
2017	183,708,000
Prior	235,366,000
Revolving Loans	556,172,000
Revolving Loans Converted To Term Loans	30,000
Total Loans	3,421,948,000	$ 2,034,851,000
Total Loans		434,000
Minimum
Loans by risk rating
Loan commitment for inclusion in credit quality analysis	50,000
Pass [Member]
Loans by risk rating
2021	1,079,972,000
2020	607,575,000
2019	392,999,000
2018	267,763,000
2017	177,970,000
Prior	225,968,000
Revolving Loans	546,694,000
Revolving Loans Converted To Term Loans	30,000
Total Loans	3,298,971,000
Special Mention [Member]
Loans by risk rating
2021	16,169,000
2020	2,222,000
2019	26,029,000
Revolving Loans	3,816,000
Total Loans	48,236,000
Substandard [Member]
Loans by risk rating
2021	21,090,000
2020	7,698,000
2019	19,098,000
2018	6,057,000
2017	5,738,000
Prior	9,398,000
Revolving Loans	5,662,000
Total Loans	74,741,000
Commercial
Loans by risk rating
2021	201,800,000	107,199,000
2020	54,770,000	42,771,000
2019	53,429,000	16,111,000
2018	28,503,000	6,265,000
2017	5,176,000	1,828,000
Prior	11,020,000	1,691,000
Revolving Loans	416,746,000	231,294,000
Revolving Loans Converted To Term Loans	30,000
Total Loans	771,474,000	407,159,000
Commercial | Pass [Member]
Loans by risk rating
2021	192,258,000	101,796,000
2020	50,638,000	42,294,000
2019	38,614,000	14,519,000
2018	28,177,000	6,265,000
2017	5,176,000	1,825,000
Prior	10,945,000	1,691,000
Revolving Loans	408,394,000	230,388,000
Revolving Loans Converted To Term Loans	30,000
Total Loans	734,232,000	398,778,000
Commercial | Special Mention [Member]
Loans by risk rating
2021	44,000	5,130,000
2020	84,000	425,000
2019	694,000	68,000
2017		3,000
Revolving Loans	3,708,000	76,000
Total Loans	4,530,000	5,702,000
Commercial | Substandard [Member]
Loans by risk rating
2021	9,498,000	273,000
2020	4,048,000	52,000
2019	14,121,000	1,524,000
2018	326,000
Prior	75,000
Revolving Loans	4,644,000	830,000
Total Loans	32,712,000	2,679,000
Consumer
Loans by risk rating
Mortgage loans in process of foreclosure	488,000	546,000
Leases
Loans by risk rating
2021	83,402,000	56,780,000
2020	44,129,000	53,765,000
2019	35,093,000	17,628,000
2018	9,573,000	6,604,000
2017	1,170,000	5,692,000
Prior	2,664,000	1,132,000
Total Loans	176,031,000	141,601,000
Leases | Pass [Member]
Loans by risk rating
2021	83,402,000	56,605,000
2020	44,129,000	52,168,000
2019	32,259,000	16,830,000
2018	8,950,000	6,545,000
2017	1,170,000	5,242,000
Prior	2,367,000	651,000
Total Loans	172,277,000	138,041,000
Leases | Substandard [Member]
Loans by risk rating
2019	2,834,000
2018	623,000
Prior	297,000
Total Loans	3,754,000
Leases | PCI | Substandard [Member]
Loans by risk rating
2020		1,434,000
2019		798,000
2018		59,000
2017		450,000
Prior		481,000
Total Loans		3,222,000
Leases | Non-PCI | Special Mention [Member]
Loans by risk rating
2021		175,000
2020		163,000
Total Loans		338,000
Commercial real estate - Investor
Loans by risk rating
2021	332,951,000	178,884,000
2020	236,342,000	169,395,000
2019	158,512,000	92,447,000
2018	85,230,000	66,762,000
2017	68,422,000	56,398,000
Prior	57,330,000	16,837,000
Revolving Loans	18,602,000	1,319,000
Total Loans	957,389,000	582,042,000
Commercial real estate - Investor | Pass [Member]
Loans by risk rating
2021	315,247,000	173,781,000
2020	233,964,000	158,677,000
2019	147,511,000	92,156,000
2018	85,049,000	66,762,000
2017	64,810,000	55,963,000
Prior	55,523,000	15,966,000
Revolving Loans	18,602,000	1,319,000
Total Loans	920,706,000	564,624,000
Commercial real estate - Investor | Special Mention [Member]
Loans by risk rating
2021	15,466,000	2,394,000
2020		9,592,000
2019	10,550,000	220,000
2017		95,000
Total Loans	26,016,000	12,301,000
Commercial real estate - Investor | Substandard [Member]
Loans by risk rating
2021	2,238,000	2,709,000
2020	2,378,000	1,126,000
2019	451,000	71,000
2018	181,000
2017	3,612,000	340,000
Prior	1,807,000	871,000
Total Loans	10,667,000	5,117,000
Commercial real estate - Owner occupied
Loans by risk rating
2021	228,642,000	74,773,000
2020	97,549,000	54,963,000
2019	66,150,000	75,499,000
2018	60,915,000	46,979,000
2017	55,487,000	50,501,000
Prior	63,119,000	29,031,000
Revolving Loans	2,522,000	1,324,000
Total Loans	574,384,000	333,070,000
Commercial real estate - Owner occupied | Pass [Member]
Loans by risk rating
2021	220,324,000	72,605,000
2020	96,607,000	52,809,000
2019	61,511,000	73,719,000
2018	60,915,000	45,315,000
2017	54,236,000	50,000,000
Prior	59,887,000	25,507,000
Revolving Loans	2,522,000	1,324,000
Total Loans	556,002,000	321,279,000
Commercial real estate - Owner occupied | Special Mention [Member]
Loans by risk rating
2021		604,000
2019	2,953,000
Total Loans	2,953,000	604,000
Commercial real estate - Owner occupied | Substandard [Member]
Loans by risk rating
2021	8,318,000	1,564,000
2020	942,000	2,154,000
2019	1,686,000	1,780,000
2018		1,664,000
2017	1,251,000	501,000
Prior	3,232,000	3,524,000
Total Loans	15,429,000	11,187,000
Construction
Loans by risk rating
2021	88,780,000	50,208,000
2020	67,767,000	27,298,000
2019	42,101,000	9,260,000
2018	4,671,000	539,000
2017	477,000	218,000
Prior	1,193,000	1,261,000
Revolving Loans	1,143,000	9,702,000
Total Loans	206,132,000	98,486,000
Construction | Pass [Member]
Loans by risk rating
2021	88,620,000	50,170,000
2020	65,629,000	24,163,000
2019	37,169,000	7,203,000
2018	2,727,000	539,000
2017	477,000	218,000
Prior	1,193,000	1,261,000
Revolving Loans	1,143,000	9,702,000
Total Loans	196,958,000	93,256,000
Construction | Special Mention [Member]
Loans by risk rating
2021		38,000
2020	2,138,000
2019	4,932,000
Total Loans	7,070,000	38,000
Construction | Substandard [Member]
Loans by risk rating
2021	160,000
2020		3,135,000
2019		2,057,000
2018	1,944,000
Total Loans	2,104,000	5,192,000
Residential real estate - Investor
Loans by risk rating
2021	13,492,000	9,720,000
2020	9,902,000	14,194,000
2019	13,084,000	9,132,000
2018	6,589,000	7,775,000
2017	7,444,000	2,522,000
Prior	11,020,000	11,650,000
Revolving Loans	1,868,000	1,144,000
Total Loans	63,399,000	56,137,000
Residential real estate - Investor | Pass [Member]
Loans by risk rating
2021	13,371,000	9,371,000
2020	9,758,000	14,194,000
2019	13,084,000	8,522,000
2018	6,392,000	7,775,000
2017	7,059,000	2,431,000
Prior	10,602,000	11,184,000
Revolving Loans	1,868,000	1,144,000
Total Loans	62,134,000	54,621,000
Residential real estate - Investor | Substandard [Member]
Loans by risk rating
2021	121,000	349,000
2020	144,000
2019		610,000
2018	197,000
2017	385,000	91,000
Prior	418,000	466,000
Total Loans	1,265,000	1,516,000
Residential real estate - Owner occupied
Loans by risk rating
2021	48,990,000	18,355,000
2020	32,095,000	23,450,000
2019	20,996,000	11,220,000
2018	14,523,000	15,628,000
2017	30,738,000	10,920,000
Prior	63,854,000	34,161,000
Revolving Loans	2,052,000	2,654,000
Total Loans	213,248,000	116,388,000
Residential real estate - Owner occupied | Pass [Member]
Loans by risk rating
2021	48,009,000	18,308,000
2020	31,912,000	23,450,000
2019	20,990,000	10,808,000
2018	13,304,000	15,409,000
2017	30,562,000	10,394,000
Prior	60,661,000	31,325,000
Revolving Loans	2,052,000	2,654,000
Total Loans	207,490,000	112,348,000
Residential real estate - Owner occupied | Special Mention [Member]
Loans by risk rating
2021	659,000
Total Loans	659,000
Residential real estate - Owner occupied | Substandard [Member]
Loans by risk rating
2021	322,000	47,000
2020	183,000
2019	6,000	412,000
2018	1,219,000	219,000
2017	176,000	526,000
Prior	3,193,000	2,836,000
Total Loans	5,099,000	4,040,000
Multifamily
Loans by risk rating
2021	109,608,000	40,740,000
2020	71,748,000	37,750,000
2019	46,193,000	48,555,000
2018	62,733,000	39,608,000
2017	11,701,000	12,265,000
Prior	7,117,000	9,925,000
Revolving Loans	64,000	197,000
Total Loans	309,164,000	189,040,000
Multifamily | Pass [Member]
Loans by risk rating
2021	109,175,000	40,671,000
2020	71,748,000	30,849,000
2019	39,293,000	44,301,000
2018	61,190,000	38,133,000
2017	11,399,000	12,147,000
Prior	7,117,000	7,735,000
Revolving Loans	64,000	197,000
Total Loans	299,986,000	174,033,000
Multifamily | Special Mention [Member]
Loans by risk rating
2020		6,901,000
2019	6,900,000
2018		548,000
Total Loans	6,900,000	7,449,000
Multifamily | Substandard [Member]
Loans by risk rating
2021	433,000	69,000
2019		4,254,000
2018	1,543,000	927,000
2017	302,000	118,000
Prior		2,190,000
Total Loans	2,278,000	7,558,000
HELOC
Loans by risk rating
2021	907,000	2,511,000
2020	2,091,000	2,174,000
2019	2,131,000	1,765,000
2018	822,000	2,157,000
2017	1,679,000	775,000
Prior	2,065,000	894,000
Revolving Loans	105,969,000	70,632,000
Total Loans	115,664,000	80,908,000
HELOC | Pass [Member]
Loans by risk rating
2021	907,000	2,511,000
2020	2,091,000	2,174,000
2019	2,131,000	1,679,000
2018	805,000	2,120,000
2017	1,667,000	504,000
Prior	1,869,000	803,000
Revolving Loans	104,843,000	69,483,000
Total Loans	114,313,000	79,274,000
HELOC | Special Mention [Member]
Loans by risk rating
Revolving Loans	108,000	94,000
Total Loans	108,000	94,000
HELOC | Substandard [Member]
Loans by risk rating
2019		86,000
2018	17,000	37,000
2017	12,000	271,000
Prior	196,000	91,000
Revolving Loans	1,018,000	1,055,000
Total Loans	1,243,000	1,540,000
HELOC - Purchased
Loans by risk rating
Prior	10,626,000	19,487,000
Total Loans	10,626,000	19,487,000
HELOC - Purchased | Pass [Member]
Loans by risk rating
Prior	10,446,000	19,487,000
Total Loans	10,446,000	19,487,000
HELOC - Purchased | Substandard [Member]
Loans by risk rating
Prior	180,000
Total Loans	180,000
Other
Loans by risk rating
2021	8,659,000	1,555,000
2020	1,102,000	574,000
2019	437,000	573,000
2018	261,000	229,000
2017	1,414,000	559,000
Prior	5,358,000	341,000
Revolving Loans	7,206,000	6,702,000
Total Loans	24,437,000	10,533,000
Other | Pass [Member]
Loans by risk rating
2021	8,659,000	1,555,000
2020	1,099,000	574,000
2019	437,000	569,000
2018	254,000	229,000
2017	1,414,000	559,000
Prior	5,358,000	341,000
Revolving Loans	7,206,000	6,702,000
Total Loans	24,427,000	10,529,000
Other | Substandard [Member]
Loans by risk rating
2020	3,000
2019		4,000
2018	7,000
Total Loans	$ 10,000	4,000
Other 1
Loans by risk rating
2021		540,725,000
2020		426,334,000
2019		282,190,000
2018		192,546,000
2017		141,678,000
Prior		126,410,000
Revolving Loans		324,968,000
Total Loans		2,034,851,000
Other 1 | Pass [Member]
Loans by risk rating
2021		527,373,000
2020		401,352,000
2019		270,306,000
2018		189,092,000
2017		139,283,000
Prior		115,951,000
Revolving Loans		322,913,000
Total Loans		1,966,270,000
Other 1 | Special Mention [Member]
Loans by risk rating
2021		8,341,000
2020		17,081,000
2019		288,000
2018		548,000
2017		98,000
Revolving Loans		170,000
Total Loans		26,526,000
Other 1 | Substandard [Member]
Loans by risk rating
2021		5,011,000
2020		7,901,000
2019		11,596,000
2018		2,906,000
2017		2,297,000
Prior		10,459,000
Revolving Loans		1,885,000
Total Loans		$ 42,055,000

Loans and Allowance for Cred_10

Loans and Allowance for Credit Losses on Loans - TDR (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2020USD ($)contract	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)contract
Troubled debt restructurings - modified during the period
# of contracts	1,000		3
Pre-modification recorded investment	$ 154,000		$ 410,000
Post-modification recorded investment	153,000		395,000
Other information
Commitments to lend to borrowers whose loans were classified as impaired	$ 0	$ 0	$ 0
Financing receivable, purchase		0
Financing receivable, sales		0
Residential owner-occupied | Home Affordable Modification Program [Member]
Troubled debt restructurings - modified during the period
# of contracts | contract	1		3
Pre-modification recorded investment	$ 154,000		$ 410,000
Post-modification recorded investment	$ 153,000		395,000
HELOC | Others [Member]
TDR's defaulted
Pre-modification outstanding recorded investment during the period		$ 0	$ 0

Loans and Allowance for Cred_11

Loans and Allowance for Credit Losses on Loans - Related Parties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Loans to principal officers, directors, and their affiliates
Beginning balance	$ 783	$ 961
New loans, including acquired related party loans	11,836	644
Repayments and other reductions	(2,457)	(822)
Ending balance	$ 10,162	$ 783

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Activity in the other real estate owned (OREO) portfolio, net of valuation reserve
Balance at beginning of period	$ 2,474	$ 5,004
Property additions, net of acquisition adjustments	5,748	898	$ 872
Less: Proceeds from property disposals, net of participation purchase and of gains/losses	5,787	3,071	2,515
Less: Period valuation (write-up)/write-down	79	357	519
Less: Other adjustments			9
Balance at end of period	2,356	2,474	5,004
Activity in the valuation allowance
Balance at beginning of period	1,643	6,712	8,027
Provision for unrealized losses	79	357	519
Provision for unrealized losses	79	357	519
Reductions taken on sales	(543)	(5,426)	(1,834)
Balance at end of period	1,179	1,643	6,712
Expenses related to foreclosed assets, net of lease revenue
(Gain) on sales, net	(41)	(204)	(264)
Provision for unrealized losses	79	357	519
Operating expenses	133	535	173
Less: Lease revenue	4	37	5
Net OREO expense	$ 167	$ 651	$ 423

Premises and Equipment (Details

Premises and Equipment (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Sep. 30, 2022item	Dec. 31, 2021USD ($)item	Dec. 31, 2020USD ($)
Premises and equipment
Cost		$ 161,545	$ 115,865
Accumulated Depreciation/Amortization		73,540	70,388
Net Book Value		88,005	45,477
Impairment charges		$ 3,800
Number of premises and equipment held for sale | item	13	4
West Suburban Bancorp, Inc
Premises and equipment
Increase in premises and equipment due to acquisition		$ 42,500
Land
Premises and equipment
Cost		42,375	18,501
Net Book Value		42,375	18,501
Buildings
Premises and equipment
Cost		59,313	43,579
Accumulated Depreciation/Amortization		26,959	25,909
Net Book Value		32,354	17,670
Leasehold Improvements
Premises and equipment
Cost		2,324	2,324
Accumulated Depreciation/Amortization		1,004	699
Net Book Value		1,320	1,625
Furniture and Fixtures
Premises and equipment
Cost		57,533	51,461
Accumulated Depreciation/Amortization		45,577	43,780
Net Book Value		$ 11,956	$ 7,681

Deposits - Classifications of D

Deposits - Classifications of Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deposits
Noninterest bearing demand	$ 1,428,055	$ 909,505
Savings	1,826,346	399,057
NOW accounts	605,056	486,612
Money market accounts	1,102,965	316,465
Certificates of deposit of less than $100,000	287,238	200,107
Certificates of deposit of $100,000 up to $250,000	147,854	164,982
Certificates of deposit of $250,000 or more	68,718	60,345
Total deposits	$ 5,466,232	$ 2,537,073

Deposits - Scheduled maturities

Deposits - Scheduled maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deposits
Time	$ 503,810	$ 425,434
Brokered certificates
Brokered certificates of deposit	10,100	59,100
Deposits held by senior officers and directors, including their related interests	26,800	2,300
Time Deposit Maturities
2022	337,822
2023	78,697
2024	38,599
2025	30,858
2026	17,834
Total	$ 503,810	$ 425,434

Borrowings - Summary (Details)

Borrowings - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Borrowings
Total borrowings	$ 198,876	$ 160,521
Securities sold under repurchase agreements
Borrowings
Total borrowings	50,337	66,980
Junior subordinated debentures
Borrowings
Total borrowings	25,773	25,773
Subordinated debentures
Borrowings
Total borrowings	59,212
Senior notes
Borrowings
Total borrowings	44,480	44,375
Notes payable and other borrowings
Borrowings
Total borrowings	$ 19,074	$ 23,393

Borrowings - Additional informa

Borrowings - Additional information (Details)	Dec. 31, 2020USD ($)	Feb. 24, 2020USD ($)	Jun. 30, 2021USD ($)	Dec. 31, 2021USD ($)item	Dec. 31, 2020USD ($)	Dec. 31, 2018USD ($)
Borrowings
Threshold percentage of stockholders' equity				10.00%
Borrowings at FHLBC as percentage of total assets				35.00%
FHLBC stock	$ 3,700,000			$ 7,100,000	$ 3,700,000
Federal Home Loan Bank Chicago ("FHLBC") and Federal Reserve Bank Chicago ("FRBC") stock	9,917,000			13,257,000	9,917,000
Fair value of securities collateralized				7,100,000
Proceeds from term note	20,000,000	$ 20,000,000
Cash distribution rate of trust preferred securities (as a percent)		7.80%
Senior notes	44,375,000			44,480,000	44,375,000
Basis points added to reference rate (as a percent)		175.00%
Debt issuance costs	1,000			1,000	1,000
Total borrowings	160,521,000			198,876,000	160,521,000
GCFC/ABC Bank
Borrowings
FHLBC advance amount	$ 6,400,000			$ 6,100,000	$ 6,400,000
Debt Instrument, Term				4 years 3 months	5 years 3 months
Debt assumed						$ 23,400,000
GCFC/ABC Bank | Maximum
Borrowings
Interest rate (as a percent)	2.83%			2.83%	2.83%
Securities sold under repurchase agreements
Borrowings
Carrying amount of securities secured	$ 67,000,000			$ 50,300,000	$ 67,000,000
Fair value of the pledged collateral	94,400,000			$ 113,000,000	94,400,000
Number of customers having secured balances exceeding specified percentage of stockholders equity | item				0
Total borrowings	66,980,000			$ 50,337,000	66,980,000
Securities sold under repurchase agreements | Minimum
Borrowings
Maturity				1 day
Securities sold under repurchase agreements | Maximum
Borrowings
Maturity				90 days
Federal Home Loan Bank Advances
Borrowings
FHLBC advance amount				$ 0
FHLBC stock	3,700,000			7,100,000	3,700,000
Fair value of securities collateralized	54,700,000				54,700,000
Principal balance of loans collateralized	625,800,000			536,900,000	625,800,000
Maximum borrowing capacity	390,400,000				390,400,000
Amount available for additional borrowings				313,100,000
Subordinated debentures
Borrowings
Total borrowings				59,212,000
Notes payable and other borrowings
Borrowings
Total borrowings	23,393,000			19,074,000	23,393,000
Junior subordinated debentures
Borrowings
Total borrowings	25,773,000			$ 25,773,000	25,773,000
Senior notes
Borrowings
Interest rate (as a percent)				5.75%
Senior notes	44,400,000			$ 44,500,000	44,400,000
Debt Instrument, Term				10 years
Interest rate term				5 years
Effective interest rate				6.06%
Debt issuance costs	625,000			$ 520,000	625,000
Amortization period for deferred financing costs				10 years
Total borrowings	44,375,000			$ 44,480,000	$ 44,375,000
Debt instrument redemption price, percentage				100.00%
Senior notes | Debt Instrument, Variable Rate Base LIBOR [Member]
Borrowings
Basis points added to reference rate (as a percent)				385.00%
Term Debt
Borrowings
Proceeds from term note	$ 13,000,000	$ 20,000,000
Effective interest rate				1.85%
Debt term				3 years
Subordinated Notes Due 2031
Borrowings
Interest rate (as a percent)			3.50%
Outstanding, net of deferred issuance costs				$ 59,200,000
Face amount			$ 60,000,000
Subordinated Notes Due 2031 | Three Months Secured Overnight Financing Rate
Borrowings
Basis points added to reference rate (as a percent)			2.73%

Borrowings - Maturities and Wei

Borrowings - Maturities and Weighted Average Rates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Scheduled maturities and weighted average rates of borrowings
Year one	$ 58,337	$ 70,980
Year two	9,000	4,000
Year three		9,000
Year five	46,554
Thereafter	84,985	76,541
Total	$ 198,876	$ 160,521
Weighted Average Rate
Year one (as a percent)	0.37%	0.46%
Year two (as a percent)	1.85%	1.91%
Year three (as a percent)		1.91%
Year five (as a percent)	5.88%
Thereafter (as a percent)	3.89%	5.24%
Total (as a percent)	3.23%	2.86%

Junior Subordinated Debentures

Junior Subordinated Debentures - Issuance (Details)	Dec. 31, 2020USD ($)	Mar. 02, 2020USD ($)$ / shares	Feb. 24, 2020USD ($)	Apr. 30, 2007USD ($)	Jun. 15, 2017	Dec. 31, 2017	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)item	Dec. 31, 2019USD ($)	Jun. 16, 2017
Junior subordinated debentures
Cash distribution rate of trust preferred securities (as a percent)			7.80%
Junior subordinated debentures	$ 25,773,000						$ 25,773,000	$ 25,773,000
Junior Subordinated Debentures issuance cost	1,000						$ 1,000	1,000
Cash disbursed for redemption		$ 33,000,000
Redemption price per share | $ / shares		$ 10.13
Proceeds from term note	20,000,000		$ 20,000,000
Unamortized debt issuance costs		$ 635,000						$ 643,000	$ 48,000
Old Second Capital Trust II [Member]
Junior subordinated debentures
Proceeds from sale of cumulative trust preferred securities				$ 25,000,000
Maturity Period							30 years
Cash distribution fixed rate of trust preferred securities (as a percent)					6.77%
Basis points added to cash distribution floating rate base (as a percent)						1.50%
Cash distribution, floating rate base							three-month LIBOR
Term Debt
Junior subordinated debentures
Proceeds from term note	$ 13,000,000		$ 20,000,000
Junior subordinated debentures
Junior subordinated debentures
Interest Payment Deferment Period | item								20
Junior subordinated debentures | Old Second Capital Trust I
Junior subordinated debentures
Cash distribution rate of trust preferred securities (as a percent)		7.80%
Junior subordinated debentures		$ 32,600,000
Amortization period		30 years
Junior subordinated debentures | Old Second Capital Trust II [Member]
Junior subordinated debentures
Interest rate (as a percent)	4.40%						4.40%	4.40%		2.80%
Junior subordinated debentures							$ 25,800,000
7.8% subordinated debentures
Junior subordinated debentures
Interest rate (as a percent)		7.80%

Income Taxes - Components (Deta

Income Taxes - Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Components of income tax expense (benefit)
Current federal	$ 750	$ 6,269	$ 4,815
Current state	594	3,960	1,151
Deferred federal	4,445	(135)	3,177
Deferred state	2,034	(511)	3,259
Total tax at effective tax rate	7,823	9,583	$ 12,402
Deferred tax assets
Allowance for credit losses	15,601	11,058
Deferred compensation	1,378	1,093
Goodwill amortization/impairment	980	2,212
Stock based compensation	971	1,356
Business combination adjustments	940	255
OREO write downs	573	614
Federal recognized built-in loss ("RBIL") carryforward	493	142
State net operating loss and RBIL carryforward		60
Other assets	2,129	2,182
Total deferred tax assets	23,065	18,972
Deferred tax liabilities
Accumulated depreciation on premises and equipment	(1,701)	(1,237)
Mortgage servicing rights	(2,113)	(1,261)
Amortization of core deposit intangible	(4,550)	(171)
State tax benefits	(641)	(930)
Securities	(2,620)
Other liabilities	(1,931)	(1,481)
Total deferred tax liabilities	(13,556)	(5,080)
Net deferred tax asset before adjustments related to other comprehensive income	9,509	13,892
Tax effect of adjustments related to other comprehensive loss	(3,410)	(5,771)
Net deferred tax asset	$ 6,099	$ 8,121

Income Taxes - Carryforwards (D

Income Taxes - Carryforwards (Details)	Dec. 31, 2021USD ($)
Federal
Net operating loss carryforward
Net operating loss carryforward, which may be carried forward indefinitely	$ 2,348,000
State and Local Jurisdiction
Net operating loss carryforward
Net operating loss carryforward	$ 0

Income Taxes - Components of De

Income Taxes - Components of Deferred Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Components of the provision for deferred income taxes
Provision for credit losses	$ (78)	$ (4,976)	$ (279)
Deferred compensation	1,388	(186)	(242)
Amortization of core deposit intangible	(18)	27	14
Stock based compensation	385	266	(245)
Business combination adjustments	80	1,292	985
OREO write-downs	1,543	1,317	406
Federal net operating loss and RBIL carryforward	(351)	198	1,859
State net operating loss and RBIL carryforward	60	266	3,708
Depreciation	(1,737)	491	303
Mortgage servicing rights	852	(518)	(431)
Goodwill amortization/impairment	1,232	1,244	1,242
State tax benefits	(491)	3	(912)
Securities	4,188
Other, net	(574)	(70)	28
Total deferred tax (benefit) expense	6,479	(646)	6,436
Difference between effective tax rates and federal statutory rates applied to financial statement income
Tax at statutory federal income tax rate	5,852	7,856	10,890
Nontaxable interest income, net of disallowed interest deduction	(1,069)	(1,067)	(1,409)
BOLI Income	(292)	(271)	(480)
State income taxes, net of federal benefit	2,054	2,570	3,496
Stock based compensation	54	297	(207)
Transaction costs	396
Other, net	828	198	112
Total tax at effective tax rate	7,823	9,583	12,402
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	$ 27,867	$ 37,408	$ 51,857

Equity Compensation Plans (Deta

Equity Compensation Plans (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	May 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	May 31, 2019
Summary Of Stock Option Activity [Abstract]
Cash received from options exercised				$ 32
Total compensation cost		$ 1,400	$ 2,100	2,500
Vesting Percentage , Fully Vest , Performance measure		50.00%
Minimum
Summary Of Stock Option Activity [Abstract]
Vesting Percentage , Fully Vest , Performance measure		50.00%
Maximum
Summary Of Stock Option Activity [Abstract]
Vesting Percentage , Pro rata , Performance measure		50.00%
2019 Plan
Summary Of Stock Option Activity [Abstract]
Number of shares authorized	1,800,000				600,000
Increase in number of shares authorized	1,200,000
Number of shares available for issuance		1,395,981
Employee and Nonemployee Stock Options [Member]
Summary Of Stock Option Activity [Abstract]
Intrinsic value of options exercised				27
Cash received from options exercised				32
Tax benefit realized from option exercises				$ 5
Restricted Stock and Restricted Stock Units [Member]
Summary Of Stock Option Activity [Abstract]
Vesting period		3 years

Equity Compensation Plans - Opt

Equity Compensation Plans - Options (Details) - USD ($)	Dec. 31, 2009	Dec. 31, 2021	Dec. 31, 2019
2009 Plan
Equity Compensation Plans
Granted (in shares)	16,500	0
Exercised (in shares)		0	4,500
Shares
Exercised (in shares)		0	(4,500)
Ending outstanding (in shares)		0
Employee and Nonemployee Stock Options [Member]
Equity Compensation Plans
Total unrecognized compensation cost		$ 0
Aggregate Intrinsic Value
Exercised (in dollars)			$ (27,000)

Equity Compensation Plans - Res

Equity Compensation Plans - Restricted Stock and RSUs (Details) - Restricted Stock and Restricted Stock Units [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Changes in unvested awards
Nonvested at the beginning of the period (in shares)	532,609
Granted (in shares)	274,881	140,944
Vested (in shares)	(199,492)
Forfeited (in shares)	(67,692)
Nonvested at the end of the period (in shares)	540,306	532,609
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 13.15
Granted (in dollars per share)	11.61
Vested (in dollars per share)	13.88
Forfeited (in dollars per share)	13.54
Nonvested at the end of the period (in dollars per share)	$ 12.42	$ 13.15
Additional information
Total unrecognized compensation cost of restricted awards	$ 3.1
Expected weighted-average period for recognition of unrecognized compensation	1 year 11 months 15 days

Earnings Per Share - Reconcilia

Earnings Per Share - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic earnings per share:
Weighted-average common shares outstanding	30,208,663	29,623,333	29,891,046
Net income	$ 20,044	$ 27,825	$ 39,455
Basic earnings per share	$ 0.66	$ 0.94	$ 1.32
Diluted earnings per share:
Weighted-average common shares outstanding	30,208,663	29,623,333	29,891,046
Diluted average common shares outstanding	30,737,862	30,174,072	30,416,348
Diluted earnings per share	$ 0.65	$ 0.92	$ 1.30
Restricted Stock and Restricted Stock Units [Member]
Diluted earnings per share:
Dilutive effect of share-based payment awards (in shares)	529,199	550,739	525,302

Commitments - Summary of Financ

Commitments - Summary of Financial Instrument Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fixed Letters of Credit [Member]
Financial instrument commitments
Financial instrument commitments	$ 840	$ 685
Fixed Letters of Credit [Member] | Commitments to Extend Credit to Borrowers [Member]
Financial instrument commitments
Financial instrument commitments	840	685
Fixed Letters of Credit [Member] | Commitments to Extend Credit to Borrowers [Member] | Financial Standby Letter of Credit [Member]
Financial instrument commitments
Financial instrument commitments	384	329
Fixed Letters of Credit [Member] | Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee [Member]
Financial instrument commitments
Financial instrument commitments	456	356
Fixed Letters of Credit [Member] | Unused lines of Credit [Member]
Financial instrument commitments
Loan commitments	84,225	88,883
Variable Letters of Credit [Member]
Financial instrument commitments
Financial instrument commitments	32,448	13,635
Variable Letters of Credit [Member] | Commitments to Extend Credit to Borrowers [Member]
Financial instrument commitments
Financial instrument commitments	32,381	13,568
Variable Letters of Credit [Member] | Commitments to Extend Credit to Borrowers [Member] | Financial Standby Letter of Credit [Member]
Financial instrument commitments
Financial instrument commitments	17,474	9,051
Variable Letters of Credit [Member] | Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee [Member]
Financial instrument commitments
Financial instrument commitments	14,907	4,517
Variable Letters of Credit [Member] | Commitments to Extend Credit Nonborrowers [Member] | Performance Guarantee [Member]
Financial instrument commitments
Financial instrument commitments	67	67
Variable Letters of Credit [Member] | Unused lines of Credit [Member]
Financial instrument commitments
Loan commitments	895,665	316,298
Letter of Credit [Member]
Financial instrument commitments
Financial instrument commitments	33,288	14,320
Letter of Credit [Member] | Commitments to Extend Credit to Borrowers [Member]
Financial instrument commitments
Financial instrument commitments	33,221	14,253
Letter of Credit [Member] | Commitments to Extend Credit to Borrowers [Member] | Financial Standby Letter of Credit [Member]
Financial instrument commitments
Financial instrument commitments	17,858	9,380
Letter of Credit [Member] | Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee [Member]
Financial instrument commitments
Financial instrument commitments	15,363	4,873
Letter of Credit [Member] | Commitments to Extend Credit Nonborrowers [Member] | Performance Guarantee [Member]
Financial instrument commitments
Financial instrument commitments	67	67
Letter of Credit [Member] | Unused lines of Credit [Member]
Financial instrument commitments
Loan commitments	$ 979,890	$ 405,181

Commitments - Lease Commitments

Commitments - Lease Commitments and Legal Proceedings (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Estimated aggregate minimum annual rental commitments
2022	$ 864,000
2023	792,000
2024	771,000
2025	738,000
2026	662,000
2027 and Thereafter	2,635,000
Aggregate future minimum rental income receivable under noncancelable leases	425,000
Total facility net operating lease revenue/expense	361,000	$ 223,000	$ 248,000
Total ATM lease expense	$ 1,200,000	$ 1,000,000	$ 916,000

Regulatory & Capital Matters (D

Regulatory & Capital Matters (Details) $ in Millions	Dec. 31, 2021USD ($)	Dec. 31, 2020
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)	7.81	10.21
Risk-based capital ratio (as a percent)	12.55	14.26
Phase out of impact of allowance for credit loss	$ 3.8
Deferment of impact on retained earnings	$ 3.8
Subsidiaries [Member]
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)	9.58	10.74
Risk-based capital ratio (as a percent)	13.46	15
Minimum | Subsidiaries [Member]
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)	8
Risk-based capital ratio (as a percent)	12

Regulatory & Capital Matters -

Regulatory & Capital Matters - Capital Levels and Industry Defined Regulatory Minimums (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Common equity tier 1 capital to risk weighted assets
Actual	$ 394,421	$ 277,199
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 291,855	$ 162,512
Common equity tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	9.46%	11.94%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	7.00%	7.00%
Total capital to risk weighted assets, Amount
Actual at period end	$ 522,932	$ 331,178
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 437,513	$ 243,855
Total capital to risk weighted assets, Ratio
Risk-based capital ratio (as a percent)	12.55	14.26
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	10.50	10.50
Tier 1 capital to risk weighted assets, Amount
Actual	$ 419,421	$ 302,199
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 354,382	$ 197,440
Tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	10.06	13.01
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	8.50	8.50
Tier 1 capital to average assets, Amount
Actual	$ 419,421	$ 302,199
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 214,812	$ 118,393
Tier 1 capital to average assets, Ratio
Tier 1 capital leverage ratio (as a percent)	7.81	10.21
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	4	4
Subsidiaries [Member]
Common equity tier 1 capital to risk weighted assets
Actual	$ 514,992	$ 318,466
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	290,487	162,128
Minimum Required to Be Well Capitalized	$ 269,738	$ 150,548
Common equity tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	12.41%	13.75%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	7.00%	7.00%
Minimum Required to Be Well Capitalized (as a percent)	6.50%	6.50%
Total capital to risk weighted assets, Amount
Actual at period end	$ 558,503	$ 347,408
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	435,682	243,186
Minimum Required to Be Well Capitalized	$ 414,935	$ 231,605
Total capital to risk weighted assets, Ratio
Risk-based capital ratio (as a percent)	13.46	15
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	10.50	10.50
Minimum Required to Be Well Capitalized (as a percent)	10	10
Tier 1 capital to risk weighted assets, Amount
Actual	$ 514,992	$ 318,466
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	352,734	196,870
Minimum Required to Be Well Capitalized	$ 331,985	$ 185,289
Tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	12.41	13.75
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	8.50	8.50
Minimum Required to Be Well Capitalized (as a percent)	8	8
Tier 1 capital to average assets, Amount
Actual	$ 514,992	$ 318,466
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	215,028	118,609
Minimum Required to Be Well Capitalized	$ 268,785	$ 148,262
Tier 1 capital to average assets, Ratio
Tier 1 capital leverage ratio (as a percent)	9.58	10.74
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	4	4
Minimum Required to Be Well Capitalized (as a percent)	5	5

Regulatory & Capital Matters _2

Regulatory & Capital Matters - Dividend Restrictions and Deferrals (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021USD ($)
Dividend Restrictions and Deferrals
Number of previous years retained profit considered for dividend payment	2 years
Minimum capital requirements, minimum percentage required	2.50%
Total dividend available	$ 9.5

Mortgage Banking Derivatives (D

Mortgage Banking Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Mortgage Banking Derivatives
Amount of loans sold to investors	$ 239,200
Proceeds from sale of loan to investors	254,374	$ 388,538	$ 168,472
Gain on sale of loan	9,300	15,519	$ 5,112
Federal National Mortgage Association [Member]
Mortgage Banking Derivatives
Amount of loans sold to investors	$ 187,500
Federal National Mortgage Association [Member] | Customer Concentration Risk | Loan receivables
Mortgage Banking Derivatives
Percentage of concentration risk	76.50%
Federal Home Loan Mortgage Corporation [Member]
Mortgage Banking Derivatives
Amount of loans sold to investors	$ 39,000
Federal Home Loan Mortgage Corporation [Member] | Customer Concentration Risk | Loan receivables
Mortgage Banking Derivatives
Percentage of concentration risk	15.90%
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Mortgage Banking Derivatives
Notional or Contractual Amount	$ 20,000	46,500
Fair value	17	(228)
Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments [Member]
Mortgage Banking Derivatives
Notional or Contractual Amount	14,414	37,972
Fair value	$ 491	$ 1,068

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value Measurements
Fair value transfer assets , level 1 to level 2	$ 0	$ 0
Fair value transfer assets , level 2 to level 1	0	0
Fair value transfer liabilities , level 1 to level 2	0	0
Fair value transfer liabilities , level 2 to level 1	0	0
Fair value transfer assets into level 3	0	0
Fair value transfer assets out of level 3	0	0
Fair value transfer liabilities into level 3	0	0
Fair value transfer liabilities out of level 3	$ 0	$ 0

Fair Value Measurements - Recur

Fair Value Measurements - Recurring (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Assets:
Securities available-for-sale	$ 1,692,488	$ 496,178
Mortgage servicing rights	7,097	4,224
US Treasury Securities
Assets:
Securities available-for-sale	202,339	4,117
US Government Corporations and Agencies Securities
Assets:
Securities available-for-sale	61,888	6,657
States and political subdivisions
Assets and liabilities measured at fair value on a recurring basis
Purchases	9,919	13,086
Assets:
Securities available-for-sale	256,465	249,259
Corporate bonds
Assets:
Securities available-for-sale	9,887
Collateralized loan obligations
Assets:
Securities available-for-sale	672,967	56,585
Asset-backed Securities
Assets:
Securities available-for-sale	236,877	131,818
Collateralized loan obligations.
Assets:
Securities available-for-sale	79,763	30,533
Fair Value, Inputs, Level 1 [Member]
Assets:
Securities available-for-sale	202,339	4,117
Fair Value, Inputs, Level 2 [Member]
Assets:
Securities available-for-sale	1,476,057	487,742
Loans held-for-sale	4,737	12,611
Other assets	3,494	9,388
Liabilities:
Other liabilities	6,788	13,071
Fair Value, Inputs, Level 3 [Member]
Assets:
Securities available-for-sale	14,092	4,319
Mortgage servicing rights	7,097	4,224
Fair Value, Inputs, Level 3 [Member] | States and political subdivisions
Assets:
Securities available-for-sale	14,100	4,300
Fair Value, Measurements, Recurring [Member]
Assets:
Securities available-for-sale	4,737
Loans held-for-sale		12,611
Mortgage servicing rights	7,097	4,224
Total financial assets	1,708,324	523,241
Liabilities:
Total	6,809	13,159
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]
Assets:
Securities available-for-sale	3,494
Other assets		9,388
Liabilities:
Other liabilities	6,809	13,159
Fair Value, Measurements, Recurring [Member] | Forward Contracts [Member]
Assets:
Securities available-for-sale	508
Other assets		840
Fair Value, Measurements, Recurring [Member] | US Treasury Securities
Assets:
Securities available-for-sale	202,339	4,117
Fair Value, Measurements, Recurring [Member] | US Government Corporations and Agencies Securities
Assets:
Securities available-for-sale	61,888	6,657
Fair Value, Measurements, Recurring [Member] | Mortgage Backed Securities, Issued by US Government Agencies
Assets:
Securities available-for-sale	172,302	17,209
Fair Value, Measurements, Recurring [Member] | States and political subdivisions
Assets:
Securities available-for-sale	256,465	249,259
Fair Value, Measurements, Recurring [Member] | Corporate bonds
Assets:
Securities available-for-sale	9,887
Fair Value, Measurements, Recurring [Member] | Collateralized loan obligations
Assets:
Securities available-for-sale	672,967	56,585
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities
Assets:
Securities available-for-sale	236,877	131,818
Fair Value, Measurements, Recurring [Member] | Collateralized loan obligations.
Assets:
Securities available-for-sale	79,763	30,533
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Total financial assets	202,339	4,117
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities
Assets:
Securities available-for-sale	202,339	4,117
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Securities available-for-sale	4,737
Loans held-for-sale		12,611
Total financial assets	1,484,796	510,581
Liabilities:
Total	6,809	13,159
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Assets:
Securities available-for-sale	3,494
Other assets		9,388
Liabilities:
Other liabilities	6,809	13,159
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Forward Contracts [Member]
Assets:
Securities available-for-sale	508
Other assets		840
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Corporations and Agencies Securities
Assets:
Securities available-for-sale	61,888	6,657
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities, Issued by US Government Agencies
Assets:
Securities available-for-sale	172,302	17,209
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | States and political subdivisions
Assets:
Securities available-for-sale	242,373	244,940
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate bonds
Assets:
Securities available-for-sale	9,887
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized loan obligations
Assets:
Securities available-for-sale	672,967	56,585
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities
Assets:
Securities available-for-sale	236,877	131,818
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized loan obligations.
Assets:
Securities available-for-sale	79,763	30,533
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Mortgage servicing rights	7,097	4,224
Total financial assets	21,189	8,543
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | States and political subdivisions
Assets:
Securities available-for-sale	$ 14,092	$ 4,319

Fair Value Measurements - Chang

Fair Value Measurements - Changes in Level 3 (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Changes in Level 3
Transfers into Level 3	$ 0	$ 0
Transfers out of Level 3	0	0
States and political subdivisions
Changes in Level 3
Beginning balance	4,319,000	5,419,000
Total gains or losses
Included in earnings (or changes in net assets)	(20,000)	(20,000)
Included in other comprehensive income	801,000	(628,000)
Purchases, issuances, sales, and settlements
Purchases	9,919,000	13,086,000
Settlements	(927,000)	(13,538,000)
Ending balance	14,092,000	4,319,000
Mortgage Servicing Rights [Member]
Changes in Level 3
Beginning balance	4,224,000	5,935,000
Total gains or losses
Included in earnings (or changes in net assets)	2,420,000	(2,483,000)
Purchases, issuances, sales, and settlements
Issuances	1,612,000	2,288,000
Settlements	(1,159,000)	(1,516,000)
Ending balance	$ 7,097,000	$ 4,224,000

Fair Value Measurements - Quant

Fair Value Measurements - Quantitative and Qualitative Information (Details)	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	$ 7,097,000	$ 4,224,000
Securities available-for-sale, at fair value	1,692,488,000	496,178,000
Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	7,097,000	4,224,000
Securities available-for-sale, at fair value	14,092,000	4,319,000
States and political subdivisions
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	256,465,000	249,259,000
States and political subdivisions | Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	14,100,000	4,300,000
Collateralized loan obligations
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	672,967,000	56,585,000
Fair Value, Measurements, Recurring [Member]
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	7,097,000	4,224,000
Securities available-for-sale, at fair value	4,737,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	7,097,000	4,224,000
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	3,494,000
Fair Value, Measurements, Recurring [Member] | States and political subdivisions
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	256,465,000	249,259,000
Fair Value, Measurements, Recurring [Member] | States and political subdivisions | Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	14,092,000	4,319,000
Fair Value, Measurements, Recurring [Member] | Collateralized loan obligations
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	672,967,000	56,585,000
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | Mortgage Servicing Rights [Member] | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	$ 7,097,000	$ 4,224,000
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | Mortgage Servicing Rights [Member] | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Minimum
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	11	11
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | Mortgage Servicing Rights [Member] | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Maximum
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	15	15
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | Mortgage Servicing Rights [Member] | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member]
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	11	11
Fair Value, Measurements, Recurring [Member] | Measurement Input, Constant Prepayment Rate | Mortgage Servicing Rights [Member] | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Minimum
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	0	5.5
Fair Value, Measurements, Recurring [Member] | Measurement Input, Constant Prepayment Rate | Mortgage Servicing Rights [Member] | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Maximum
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	36.6	59.1
Fair Value, Measurements, Recurring [Member] | Measurement Input, Constant Prepayment Rate | Mortgage Servicing Rights [Member] | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member]
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	11.9	19.5

Fair Value Measurements - Nonre

Fair Value Measurements - Nonrecurring (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets and liabilities measured at fair value
Valuation allowance	$ 5,400,000	$ 2,600,000
Valuation allowance	18,500,000	12,300,000
Increase (decrease) of specific allocations within the provision for loan losses	2,700,000	1,400,000
Carrying value of other real estate owned	2,356,000	2,474,000	$ 5,004,000		$ 7,175,000
OREO Valuation allowance	1,179,000	1,643,000	6,712,000	$ 8,027,000
Fair Value, Measurements, Nonrecurring [Member]
Assets and liabilities measured at fair value
Total	15,494,000	12,149,000
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]
Assets and liabilities measured at fair value
Total	13,138,000	9,675,000
Valuation allowance	18,500,000
Increase (decrease) of specific allocations within the provision for loan losses	2,700,000
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member]
Assets and liabilities measured at fair value
Total	2,356,000	2,474,000
Carrying value of other real estate owned	2,400,000	2,500,000	2,500,000
Outstanding balance	3,700,000	4,100,000
OREO Valuation allowance	1,200,000	1,600,000	$ 1,600,000
OREO participations	131,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets and liabilities measured at fair value
Total	15,494,000	12,149,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Assets and liabilities measured at fair value
Total	13,138,000	9,675,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Assets and liabilities measured at fair value
Total	$ 2,356,000	$ 2,474,000

Fair Values of Financial Inst_3

Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020
Fair Values of Financial Instruments
Proceeds from sales of FHLBC/FRBC stock	$ 6,875
Financial assets:
Cash and due from banks		$ 38,565	$ 24,306
Interest earning deposits with financial institutions		713,542	305,597
Securities available-for-sale		1,692,488	496,178
FHLBC and FRBC Stock		13,257	9,917
Bank-owned life insurance		105,300	63,102
Mortgage servicing rights		7,097	4,224
Financial liabilities:
Noninterest bearing deposits		1,428,055	909,505
Junior subordinated debentures		25,773	25,773
Senior notes		44,480	44,375
States and political subdivisions
Financial assets:
Securities available-for-sale		256,465	249,259
Reported Value Measurement [Member]
Financial assets:
Cash and due from banks		38,565	24,306
Interest earning deposits with financial institutions		713,542	305,597
Securities available-for-sale		1,692,488	496,178
FHLBC and FRBC Stock		13,257	9,917
Loans held for sale		4,737	12,611
Net loans		3,377,667	2,000,996
Mortgage servicing rights		7,097	4,224
Interest rate swap agreements		3,494	9,388
Interests rate lock commitments and forward contracts		508	840
Interest receivable on securities and loans		13,431	9,698
Financial liabilities:
Noninterest bearing deposits		1,428,055	909,505
Interest bearing deposits		4,038,177	1,627,568
Securities sold under repurchase agreements		50,377	66,980
Junior subordinated debentures		25,773	25,773
Subordinated debentures		59,212	44,375
Senior notes		44,480
Note payable and other borrowings		19,074	23,393
Interest rate swap agreements		6,788	13,071
Interest payable on deposits and borrowings		1,706	418
Estimate of Fair Value Measurement [Member]
Financial assets:
Cash and due from banks		38,565	24,306
Interest earning deposits with financial institutions		713,542	305,597
Securities available-for-sale		1,692,488	496,178
FHLBC and FRBC Stock		13,257	9,917
Loans held for sale		4,737	12,611
Net loans		3,408,199	2,009,773
Mortgage servicing rights		7,097	4,224
Interest rate swap agreements		3,494	9,388
Interests rate lock commitments and forward contracts		508	840
Interest receivable on securities and loans		13,431	9,698
Financial liabilities:
Noninterest bearing deposits		1,428,055	909,505
Interest bearing deposits		4,041,369	1,630,109
Securities sold under repurchase agreements		50,377	66,980
Junior subordinated debentures		18,557	14,658
Subordinated debentures		60,111	44,600
Senior notes		44,480
Note payable and other borrowings		19,411	24,043
Interest rate swap agreements		6,788	13,071
Interest payable on deposits and borrowings		1,706	418
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and due from banks		38,565	24,306
Interest earning deposits with financial institutions		713,542	305,597
Securities available-for-sale		202,339	4,117
Financial liabilities:
Noninterest bearing deposits		1,428,055	909,505
Subordinated debentures			44,600
Senior notes		44,480
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Securities available-for-sale		1,476,057	487,742
FHLBC and FRBC Stock		13,257	9,917
Loans held for sale		4,737	12,611
Interest rate swap agreements		3,494	9,388
Interests rate lock commitments and forward contracts		508	840
Interest receivable on securities and loans		13,431	9,698
Financial liabilities:
Interest bearing deposits		4,041,369	1,630,109
Securities sold under repurchase agreements		50,377	66,980
Junior subordinated debentures		18,557	14,658
Subordinated debentures		60,111
Note payable and other borrowings		19,411	24,043
Interest rate swap agreements		6,788	13,071
Interest payable on deposits and borrowings		1,706	418
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Securities available-for-sale		14,092	4,319
Net loans		3,408,199	2,009,773
Mortgage servicing rights		7,097	4,224
Fair Value, Inputs, Level 3 [Member] | States and political subdivisions
Financial assets:
Securities available-for-sale		$ 14,100	$ 4,300

Financial Instruments with Of_3

Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions - Fair Value of Derivatives (Details)	1 Months Ended	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2021USD ($)item	Dec. 31, 2020USD ($)item
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Loan pool hedge	$ 50,000,000
Term of interest rate risk cash flow hedge	5 years
Amount of ineffectiveness, included in net income		$ 0
Interest Rate Swap [Member]
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Notional Amount		25,800,000	$ 25,800,000
Designated as Hedging Instrument [Member]
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative assets designated as hedging instruments, fair value		808,000	2,697,000
Derivative liabilities designated as hedging instruments, fair value		$ 4,102,000	$ 6,380,000
Designated as Hedging Instrument [Member] | Interest Rate Products | OSBC Affiliates
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative, number of transactions | item		2	2
Notional Amount		$ 75,774,000	$ 75,774,000
Derivative assets designated as hedging instruments, fair value		808,000	2,697,000
Derivative liabilities designated as hedging instruments, fair value		4,102,000	6,380,000
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Cash collateral pledged with financial institutions, dollars			17,200,000
Not Designated as Hedging Instrument [Member]
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative assets designated as hedging instruments, fair value		3,194,000	7,531,000
Derivative liabilities designated as hedging instruments, fair value		$ 2,707,000	$ 6,779,000
Not Designated as Hedging Instrument [Member] | Interest Rate Products | Commercial Loan Customers
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative, number of transactions | item		26	28
Notional Amount		$ 165,005,000	$ 189,126,000
Derivative assets designated as hedging instruments, fair value		2,686,000	6,691,000
Derivative liabilities designated as hedging instruments, fair value		$ 2,686,000	$ 6,691,000
Weighted average maturity		3 years 10 months 24 days	4 years 8 months 12 days
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Notional Amount			$ 189,100,000
Cash collateral pledged with financial institutions, dollars		$ 17,200,000
Investment securities pledged with financial institutions, dollars		$ 0	$ 0
Number of correspondent financial institutions where investment securities are pledged		1	1
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Cash Flow Hedging
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Cash collateral pledged with financial institutions, dollars		$ 180,000	$ 1,400,000
Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments and Forward Contracts.
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative, number of transactions | item		87	205
Notional Amount		$ 34,414,000	$ 84,472,000
Derivative assets designated as hedging instruments, fair value		$ 508,000	$ 840,000
Not Designated as Hedging Instrument [Member] | Other Contracts
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative, number of transactions | item		3	4
Notional Amount		$ 17,173,000	$ 26,523,000
Derivative liabilities designated as hedging instruments, fair value		21,000	88,000
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Notional Amount		20,000,000	46,500,000
Interest Income [Member]
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Amount to be reclassified as a reduction to interest expense during the next twelve months		190,000	$ 190,000
Interest Expense [Member]
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Amount to be reclassified as a reduction to interest expense during the next twelve months		$ 174,000

Financial Instruments with Of_4

Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions - Effect of Fair Value (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income	$ 2,400,000	$ 2,700,000
Amount of Gain or (Loss) Recognized in Income on Derivative	$ 56,000	$ 57,000

Preferred Stock (Details)

Preferred Stock (Details) - shares	Dec. 31, 2021	Dec. 31, 2020
Preferred Stock.
Preferred stock, Shares authorized	300,000	300,000

Parent Company Condensed Fina_3

Parent Company Condensed Financial Information - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets
Other assets	$ 60,439	$ 47,053
Total assets	6,212,189	3,040,837
Liabilities and Stockholders' Equity
Junior subordinated debentures	25,773	25,773
Subordinated debt	59,212
Senior notes	44,480	44,375
Other liabilities	45,054	36,156
Stockholders' equity	502,027	307,087	$ 277,864	$ 229,081
Total liabilities and stockholders' equity	6,212,189	3,040,837
Parent Company [Member]
Assets
Noninterest bearing deposit with bank subsidiary	25,112	47,601
Investment in subsidiaries	626,325	353,722
Other assets	1,111	3,270
Total assets	652,548	404,593
Liabilities and Stockholders' Equity
Junior subordinated debentures	25,773	25,773
Subordinated debt	59,212
Senior notes	44,480	44,375
Notes Payable	13,000	17,000
Other liabilities	8,056	10,358
Stockholders' equity	502,027	307,087
Total liabilities and stockholders' equity	$ 652,548	$ 404,593

Parent Company Condensed Fina_4

Parent Company Condensed Financial Information - Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Expenses
Junior subordinated debentures	$ 1,133	$ 2,215	$ 3,724
Subordinated debentures	1,610
Senior notes	2,692	2,692	2,699
Income before income taxes and equity in undistributed net income of subsidiaries	27,867	37,408	51,857
Income tax benefit	7,823	9,583	12,402
Net income	20,044	27,825	39,455
Parent Company [Member]
Operating Income
Cash dividends received from subsidiaries	40,000	41,300	20,000
Other income	15	32	109
Total operating income	40,015	41,332	20,109
Operating Expenses
Junior subordinated debentures	1,133	2,216	3,724
Subordinated debentures	1,610
Senior notes	2,692	2,693	2,700
Notes payable	291	362
Other interest expense			13
Other expenses	6,918	3,669	4,025
Total operating expense	12,644	8,940	10,462
Income before income taxes and equity in undistributed net income of subsidiaries	27,371	32,392	9,647
Income tax benefit	(2,986)	(2,215)	(3,187)
Income before equity in undistributed net income of subsidiaries	30,357	34,607	12,834
Equity in undistributed net income of subsidiaries	(10,313)	(6,782)	26,621
Net income	$ 20,044	$ 27,825	$ 39,455

Parent Company Condensed Fina_5

Parent Company Condensed Financial Information -Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities
Net Income	$ 20,044	$ 27,825	$ 39,455
Adjustments to reconcile net income to net cash from operating activities:
Provision for deferred tax expense (benefit)	6,479	(646)	6,436
Change in taxes payable	(9,286)	811	1,546
Stock based compensation	1,435	2,089	2,516
Net cash provided by operating activities	31,047	25,987	52,637
Cash Flows from Investing Activities
Cash and cash equivalents acquired, net of cash paid for acquisition	148,995
Net cash provided by (used in) investing activities	132,918	(103,808)	42,212
Cash Flows from Financing Activities
Dividends paid on common stock	(4,612)	(1,186)	(1,195)
Purchases of treasury stock	(10,417)	(5,922)	(666)
Redemption of junior subordinated debentures		(32,604)
Issuance of term note		20,000
Issuance of sub debt	59,148
Repayment of term note	(315)	(307)	(8,798)
Proceeds from exercise of stock options			32
Net cash provided by (used in) financing activities	258,239	357,092	(99,452)
Net change in cash and cash equivalents	422,204	279,271	(4,603)
Cash and cash equivalents at beginning of period	329,903	50,632	55,235
Cash and cash equivalents at end of period	752,107	329,903	50,632
Parent Company [Member]
Cash Flows from Operating Activities
Net Income	20,044	27,825	39,455
Adjustments to reconcile net income to net cash from operating activities:
Equity in undistributed net income of subsidiaries	10,313	6,782	(26,621)
Provision for deferred tax expense (benefit)	(248)	(514)	4,186
Change in taxes payable	(695)	5,933	3,896
Change in other assets	(12)	954
Stock based compensation	1,435	2,089	2,516
Other, net	961	682	(80)
Net cash provided by operating activities	31,798	43,751	23,352
Cash Flows from Investing Activities
Cash and cash equivalents acquired, net of cash paid for acquisition	(94,406)
Net cash provided by (used in) investing activities	(94,406)
Cash Flows from Financing Activities
Net change in other short-term borrowings			(4,000)
Dividends paid on common stock	(4,612)	(1,186)	(1,195)
Purchases of treasury stock	(10,417)	(5,922)	(666)
Redemption of junior subordinated debentures		(32,604)
Issuance of term note		20,000
Issuance of sub debt	59,148
Repayment of term note	(4,000)	(3,000)
Proceeds from exercise of stock options			32
Net cash provided by (used in) financing activities	40,119	(22,712)	(5,829)
Net change in cash and cash equivalents	(22,489)	21,039	17,523
Cash and cash equivalents at beginning of period	47,601	26,562	9,039
Cash and cash equivalents at end of period	$ 25,112	$ 47,601	$ 26,562

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended				24 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017	Dec. 31, 2019
Employee Benefit Plans
Expense relating to the 401(k) plan	$ 1.4	$ 1.2	$ 1.1
Old Second Bancorp Inc Employees 401(k) Savings Plan and Trust
Employee Benefit Plans
Company's discretionary matching contributions to the Plan (as a percent)					100.00%
Company's discretionary matching contributions to the Plan (as a percent)					50.00%
Percentage of compensation contributed to the Plan matched by employer (as a percent)					2.00%
Percentage of compensation contributed to the Plan matched by employer					3.00%
Participants vesting as percentage of discretionary matching contributions				100.00%