Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities:
Net income	$ 62,011	$ 23,551
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment, and amortization	3,357	3,193
Amortization of intangible assets	2,862	2,862
Provision for (reversal of) credit losses on loans	(6,385)	30,089
Amortization of investment securities premium, net	2,855	1,054
Gain on sale of investment securities	0	0
Originations of loans for resale	(129,684)	(84,872)
Proceeds from sale of loans originated for resale	135,353	83,867
Gain on sale of loans	(6,094)	(2,627)
Change in market value of mortgage servicing rights	459	2,494
Provision for losses on foreclosed assets	9	106
Gain on transfer of loans to foreclosed assets	(20)	0
Gain on sale of foreclosed assets	(46)	(57)
Operating lease expense payments	(2,430)	(2,480)
(Gain) loss on disposal of fixed assets	(426)	15
Increase in cash value of life insurance	(1,418)	(1,430)
Loss (gain) on marketable equity securities	45	(72)
Equity compensation vesting expense	1,163	931
Change in:
Interest receivable	1,081	(1,440)
Interest payable	(336)	(673)
Amortization of operating lease ROUA	2,645	2,720
Other assets and liabilities, net	(6,195)	6,474
Net cash from operating activities	58,806	63,705
Investing activities:
Proceeds from maturities of securities available for sale	180,046	60,637
Proceeds from maturities of securities held to maturity	48,269	37,905
Purchases of securities available for sale	(620,634)	(101,899)
Loan origination and principal collections, net	(79,803)	(493,437)
Loans purchased	(101,466)	0
Proceeds from sale of other real estate owned	756	570
Proceeds from sale of premises and equipment	2,700	0
Purchases of premises and equipment	(854)	(1,266)
Net cash used by investing activities	(570,986)	(497,490)
Financing activities:
Net change in deposits	486,119	881,264
Net change in other borrowings	13,645	20,090
Repurchase of common stock, net of option exercises	(2,561)	(25,164)
Dividends paid	(14,862)	(13,208)
Exercise of stock options	28	148
Net cash from financing activities	482,369	863,130
Net change in cash and cash equivalents	(29,811)	429,345
Cash and cash equivalents, beginning of period	669,551	276,507
Cash and cash equivalents, end of period	639,740	705,852
Supplemental disclosure of noncash activities:
Unrealized (loss) gain on securities available for sale	(4,945)	5,398
Market value of shares tendered in-lieu of cash to pay for exercise of options and/or related taxes	451	494
Obligations incurred in conjunction with leased assets	1,308	4,068
Loans transferred to foreclosed assets	102	0
Supplemental disclosure of cash flow activity:
Cash paid for interest expense	3,208	6,487
Cash paid for income taxes	$ 33,300	$ 0