Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net income	$ 89,433	$ 41,157
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment, and amortization	4,923	4,778
Amortization of intangible assets	4,271	4,293
Provision for (reversal of) credit losses on loans	(7,880)	37,738
Amortization of investment securities premium, net	4,702	1,747
Gain on sale of investment securities	0	(7)
Originations of loans for resale	(175,127)	(152,968)
Proceeds from sale of loans originated for resale	184,896	156,347
Gain on sale of loans	(7,908)	(5,662)
Change in market value of mortgage servicing rights	691	2,258
Provision for losses on foreclosed assets	0	0
(Gain) loss on transfer of loans to foreclosed assets	(133)	128
Gain on sale of foreclosed assets	(68)	(57)
Operating lease expense payments	(3,690)	(3,716)
(Gain) loss on disposal of fixed assets	(445)	37
Increase in cash value of life insurance	(2,062)	(2,203)
(Gain) loss on marketable equity securities	59	(72)
Equity compensation vesting expense	1,900	1,476
Change in:
Interest receivable	1,579	(660)
Interest payable	(306)	(836)
Amortization of operating lease ROUA	4,038	4,070
Other assets and liabilities, net	1,046	(9,264)
Net cash from operating activities	99,919	78,584
Investing activities:
Proceeds from maturities of securities available for sale	263,865	114,122
Proceeds from maturities of securities held to maturity	66,880	64,054
Proceeds from sale of available for sale securities	0	229
Purchases of securities available for sale	(960,668)	(298,018)
Loan origination and principal collections, net	(21,869)	(518,564)
Loans purchased	(102,710)	0
Proceeds from sale of other real estate owned	944	570
Proceeds from sale of premises and equipment	2,743	0
Purchases of premises and equipment	(2,114)	(2,340)
Net cash used by investing activities	(752,929)	(639,947)
Financing activities:
Net change in deposits	730,888	973,594
Net change in other borrowings	18,687	8,601
Repurchase of common stock, net of option exercises	(3,675)	(24,999)
Dividends paid	(22,291)	(19,758)
Exercise of stock options	86	0
Net cash from financing activities	723,695	937,438
Net change in cash and cash equivalents	70,685	376,075
Cash and cash equivalents, beginning of period	669,551	276,507
Cash and cash equivalents, end of period	740,236	652,582
Supplemental disclosure of noncash activities:
Unrealized (loss) gain on securities available for sale	(11,249)	10,036
Market value of shares tendered in-lieu of cash to pay for exercise of options and/or related taxes	835	736
Obligations incurred in conjunction with leased assets	2,883	4,161
Loans transferred to foreclosed assets	549	157
Supplemental disclosure of cash flow activity:
Cash paid for interest expense	4,573	8,634
Cash paid for income taxes	$ 38,500	$ 26,000