Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities
Net income	$ 12,173	$ 19,778	$ 29,919
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Net premium amortization/discount (accretion) on securities		1,712	2,128
Securities (gains) losses, net	(3,463)	25	(4,476)
Provision for credit losses	550	10,413	1,450
Originations of loans held-for-sale		(296,388)	(126,929)
Proceeds from sales of loans held-for-sale		300,045	127,455
Net gain on sales of mortgage loans	(2,074)	(12,123)	(3,999)
Change in fair value of mortgage servicing rights	946	2,739	2,902
Net discount / premium from (accretion) amortization on loans		(841)	(1,052)
Change in cash surrender value of BOLI	267	942	1,045
Net gains on sale of other real estate owned	(104)	(188)	(254)
Provision for other real estate owned valuation losses	203	264	399
Depreciation of fixed assets and amortization of leasehold improvements		2,075	1,869
Net (gains) / losses on disposal and transfer of fixed assets			(32)
Amortization of core deposit intangible	157	374	410
Change in current income taxes receivable		(781)	3,319
Provision for deferred tax expense		(693)	4,493
Change in accrued interest receivable and other assets		(19,144)	(7,441)
Accretion of purchase accounting adjustment on time deposits			(38)
Amortization of purchase accounting adjustment on notes payable and other borrowings		25	75
Amortization of junior subordinated debentures issuance costs		643	36
Amortization of senior notes issuance costs		79	86
Change in accrued interest payable and other liabilities		8,060	6,366
Stock based compensation		1,623	1,905
Net cash provided by operating activities		16,755	37,546
Cash flows from investing activities
Proceeds from maturities and calls including pay down of securities available-for-sale		41,645	32,631
Proceeds from sales of securities available-for-sale	57,228	18,006	177,824
Purchases of securities available-for-sale		(14,681)	(136,096)
Net proceeds from sales of FHLBC stock			2,722
Net change in loans		(100,370)	(2,833)
Proceeds from claims on BOLI		483
Proceeds from sales of other real estate owned, net of participation purchase		3,140	2,644
Proceeds from disposition of premises and equipment			32
Net purchases of premises and equipment		(2,635)	(2,330)
Net cash provided by investing activities		(54,412)	74,594
Cash flows from financing activities
Net change in deposits		352,494	(42,144)
Net change in securities sold under repurchase agreements		10,575	2,238
Net change in other short-term borrowings		(42,375)	(65,500)
Redemption of junior subordinated debentures		(32,604)
Issuance of term note		20,000
Repayment of term note		(2,000)
Net change in notes payable and other borrowings		(229)	(6,598)
Proceeds from exercise of stock options			32
Dividends paid common stock		(893)	(896)
Purchase of treasury stock		(4,803)	(470)
Net cash used in financing activities		300,165	(113,338)
Net change in cash and cash equivalents		262,508	(1,198)
Cash and cash equivalents at beginning of period		50,632	55,235
Cash and cash equivalents at end of period	$ 54,037	$ 313,140	$ 54,037