CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating Activities
Net Income	$ 52,523	$ 41,208
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Originations of mortgage loans held for sale	(359,842)	(475,131)
Proceeds from the sale of mortgage loans	400,812	460,130
Gain on sale of mortgage loans, net of origination costs	(11,260)	(10,385)
Provision (credit) for credit losses	(4,420)	12,160
Depreciation and amortization expense	2,779	2,850
Investment securities amortization and accretion, net	5,238	3,115
Stock-based compensation expense	2,007	1,373
Amortization of core deposit intangible assets	491	511
Purchase accounting accretion, net	(589)	(924)
Net decrease (increase) in derivative collateral posted	25,090	(30,250)
Decrease (increase) in other assets	2,827	(10,088)
Decrease in other liabilities	(3,994)	(501)
Net cash provided by (used in) by operating activities	111,662	(5,932)
Investing Activities
Proceeds from available-for-sale debt securities	248,186	181,489
Payments to Acquire Debt Securities, Available-for-sale	618,744	341,100
Net increase in loans	(95,720)	(180,174)
Purchase of Federal Home Loan Bank stock	(68)	(9,231)
Proceeds from sale of Federal Home Loan Bank stock	1,329	9,535
Purchase of premises and equipment	1,549	2,591
Recoveries of previously charged-off loans	272	352
Proceeds from the sale of other real estate owned	465	110
Net cash used in investing activities	(465,829)	(341,610)
Financing Activities
Net increase in deposits	599,936	686,314
Net proceeds from (repayments of) borrowings less than 90 days	49,113	(58,754)
Proceeds from Federal Home Loan Bank long-term advances	0	25,000
Repayments of Federal Home Loan Bank long-term advances	25,000	10,000
Repayment of subordinated debt	(15,000)	0
Common stock repurchases	(4,924)	(9,140)
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings	(241)	(113)
Cash dividends paid on common stock	15,721	14,907
Finance lease payments	(114)	(105)
Net cash provided by financing activities	588,049	618,295
Net increase in cash, cash equivalents and restricted cash	233,882	270,753
Cash, cash equivalents, and restricted cash at beginning of period	145,774	75,636
Cash, cash equivalents and restricted cash at end of period	379,656	346,389
Supplemental information
Interest paid	8,523	17,778
Income taxes paid	14,277	10,689
Transfer from premises to other real estate owned	204	24
Unsettled common stock repurchase	$ 0	$ 235