Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net income	$ 67,405	$ 20,044	$ 27,825
Adjustments to reconcile net income to net cash provided by operating activities:
Net premium / discount amortization on securities	5,217	2,932	2,329
Securities losses (gains), net	944	(232)	25
Provision for credit losses	6,550	4,326	10,413
Originations of loans held-for-sale	(76,607)	(239,175)	(384,379)
Proceeds from sales of loans held-for-sale	81,776	254,374	388,538
Net gains on sales of mortgage loans	(2,022)	(9,300)	(15,519)
Mortgage servicing rights mark to market (gain) loss	(3,177)	(1,261)	3,999
Net accretion of discount on loans and unfunded commitments	(6,339)	(1,177)	(911)
Net change in cash surrender value of BOLI	(718)	(1,390)	(1,233)
Net gains on sale of other real estate owned	(163)	(41)	(204)
Provision for other real estate owned valuation losses	104	79	357
Depreciation of fixed assets and amortization of leasehold improvements	4,085	3,152	2,798
Write-down of fixed assets		3,809
Net gains on disposal and transfer of fixed assets	(2,017)
Amortization of core deposit intangibles	2,626	644	494
Change in current income taxes receivable	12,048	(9,286)	811
Deferred tax expense (benefit)	969	6,479	(646)
Change in accrued interest receivable and other assets	(940)	6,865	(17,692)
Accretion of purchase accounting adjustment on time deposits	(1,582)	(155)
Change in accrued interest payable and other liabilities	6,225	(11,075)	6,893
Stock-based compensation	2,960	1,435	2,089
Net cash provided by operating activities	97,344	31,047	25,987
Cash flows from investing activities
Proceeds from maturities and calls, including pay down of securities available-for-sale	279,848	138,874	48,054
Proceeds from sales of securities available-for-sale	30,981	605,846	18,006
Purchases of securities available-for-sale	(301,649)	(886,103)	(65,229)
Proceeds from redemption of FHLBC/FRBC stock	1,444
Purchases of FHLBC/FRBC stock	(8,717)
Net change in loans	(443,904)	122,102	(103,887)
Purchases of BOLI policies	(590)	(591)	(590)
Proceeds from claims on BOLI, net of claims receivable			484
Proceeds from sales of other real estate owned, net of participations and improvements	941	5,828	3,275
Proceeds from disposition of premises and equipment	13,346
Net purchases of premises and equipment	(4,332)	(2,033)	(3,921)
Cash paid for acquisition, net of cash and cash equivalents retained	(146)	148,995
Net cash used in investing activities	(432,778)	132,918	(103,808)
Cash flows from financing activities
Net change in deposits	(353,927)	235,078	410,324
Net change in securities sold under repurchase agreements	(18,181)	(16,643)	18,287
Net change in other short-term borrowings	90,000		(48,500)
Redemption of junior subordinated debentures			(32,604)
Issuance of subordinated debentures, net of issuance costs		59,148
Issuance of term note			20,000
Repayment of term note	(4,000)	(4,000)	(3,000)
Net change in notes payable and other borrowings, excluding term note	(6,056)	(315)	(307)
Dividends paid on common stock	(8,877)	(4,612)	(1,186)
Purchase of treasury stock	(455)	(10,417)	(5,922)
Net cash (used in) provided by financing activities	(301,496)	258,239	357,092
Net change in cash and cash equivalents	(636,930)	422,204	279,271
Cash and cash equivalents at beginning of year	752,107	329,903	50,632
Cash and cash equivalents at end of year	115,177	752,107	329,903
Supplemental cash flow information
Income taxes paid, net	10,324	10,612	7,922
Interest paid for deposits	3,418	2,752	7,255
Interest paid for borrowings	6,777	5,366	5,093
Non-cash transfer of loans to other real estate owned	87	$ 196	$ 898
Non-cash transfer of fixed assets to other assets	$ 4,568