CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income		$ 56,682	$ 51,263
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		(2,000)	10,561
Depreciation of premises and equipment		2,549	2,318
Net amortization of premiums and discounts on securities and loans		2,742	4,101
Amortization of intangibles		674	688
Share-based compensation		2,705	2,696
Tax benefit (expense) from stock option exercises and other equity awards		135	(70)
Income from bank-owned life insurance	[1]	(1,781)	(1,922)
Net gains on loan sales, including changes in fair value		(24,093)	(33,799)
Proceeds from sales of loans, net		706,253	586,677
Loans originated for sale		(634,451)	(599,789)
(Increase) decrease in operating lease right-of-use assets		2,003	(3,069)
Increase (decrease) in operating lease liabilities		(1,907)	3,151
(Increase) decrease in other assets		34,107	(67,262)
Increase (decrease) in other liabilities		(36,698)	62,634
Net cash provided by (used in) operating activities		106,920	18,178
Cash flows from investing activities:
Purchases of mortgage-backed securities available for sale		(297,810)	(247,957)
Purchases of other debt securities available for sale		(221,166)	(129,000)
Maturities, calls and principal payments of mortgage-backed securities available for sale		274,169	228,268
Maturities, calls and principal payments of other debt securities available for sale		70,500	140,500
Net redemption (purchases) of Federal Home Loan Bank stock		15,191	13,384
Net (increase) decrease in loans		(80,021)	(332,850)
Purchases of loans		(41,546)	(51,081)
Proceeds from the sale of property acquired through foreclosure or repossession		0	1,107
Purchases of premises and equipment		(2,166)	(1,331)
Purchases of bank-owned life insurance		(7,000)	0
Proceeds from surrender of bank-owned life insurance		0	787
Net cash provided by (used in) investing activities		(289,849)	(378,173)
Cash flows from financing activities:
Net increase (decrease) in deposits		679,789	786,811
Proceeds from Federal Home Loan Bank advances		1,173,000	1,592,500
Repayment of Federal Home Loan Bank advances		(1,544,267)	(2,020,096)
Proceeds from Payment Protection Program Lending Facility		0	200,628
Repayment of Payment Protection Program Lending Facility		0	(94,882)
Treasury stock purchased		0	(4,322)
Net proceeds from stock option exercises and issuance of other equity awards, net of awards surrendered		(165)	(417)
Cash dividends paid		(27,308)	(26,667)
Net cash provided by (used in) financing activities		281,049	433,555
Net increase (decrease) in cash and cash equivalents		98,120	73,560
Cash and cash equivalents at beginning of period		202,268	138,455
Cash and cash equivalents at end of period		300,388	212,015
Noncash Activities:
Loans charged off		630	1,072
Loans transferred to property acquired through foreclosure or repossession		0	28
Supplemental Disclosures:
Interest payments		14,675	36,868
Income tax payments		$ 15,551	$ 15,039

[1] As reported in the Consolidated Statements of Income.