Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 19,372		$ 21,142	$ 59,371	$ 68,691
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization				3,843	3,791
Deferred taxes				306	(642)
Stock-based compensation				1,008	636
Provision for credit losses (recovery)	2,414	$ 100	(163)	3,366	(6,919)	$ (6,386)
Write-downs of other real estate owned and other repossessed assets				275	637
Gains on sale of mortgage loans held for sale	(235)		(1,239)	(1,351)	(5,579)
Securities (gains)/losses				1	(60)
Fair value adjustment in equity securities	159		62	284	10
Gains on sale of assets, net				(211)	(223)
Proceeds from sale of mortgage loans held for sale				59,416	250,070
Funding of mortgage loans held for sale				(56,476)	(233,288)
Amortization of securities premiums and discounts, net				4,521	5,977
Change in cash surrender value of bank owned life insurance				(1,357)	(1,094)
Payment of operating lease liabilities				(1,325)	(1,271)
Mortgage servicing rights:
Fair value adjustments				(1,247)	(380)
New servicing assets created				(555)	(1,817)
Changes in:
Accrued interest receivable				(1,098)	538
Other assets				911	4,125
Accrued interest payable				1,485	601
Other liabilities				1,247	(1,869)
Net cash provided by operating activities				72,414	81,934
Securities available-for-sale (AFS):
Purchase of AFS securities				(178,055)	(795,657)
Proceeds from sales of AFS securities				0	1,080
Proceeds from prepayments, calls, and maturities of AFS securities				148,494	243,420
Change in loans, net				(221,985)	156,259
Purchase of premises and equipment				(4,309)	(1,171)
Proceeds from sale and retirement of premises and equipment				512	830
Proceeds from sale of stock by Federal Home Loan Bank				1,463	1,909
Proceeds from sale of other real estate owned and repossessed assets				955	2,556
Additional investment in other real estate owned and repossessed assets				(73)	(17,825)
Proceeds from settlement of bank owned life insurance				1	0
Net cash used in investing activities				(252,997)	(408,599)
Cash flows from financing activities:
Change in deposits, net				190,776	280,154
Change in repurchase agreements and federal funds purchased, net				(40,965)	(63,840)
Proceeds from Federal Home Loan Bank advances				20,000	0
Payments on advances from Federal Home Loan Bank				(20,015)	(15)
Payment of finance lease liabilities				(18)	(14)
Issuance of common stock				755	719
Dividends paid				(22,077)	(20,798)
Net cash provided by financing activities				128,456	196,206
Net decrease in cash and cash equivalents				(52,127)	(130,459)
Cash and cash equivalents at beginning of period		$ 311,756		311,756	338,235	338,235
Cash and cash equivalents at end of period	$ 259,629		$ 207,776	259,629	207,776	$ 311,756
Supplemental disclosures:
Income taxes paid				12,260	16,885
Interest paid				14,441	10,948
Non-cash activities:
Loans to facilitate the sale of other real estate owned and repossessed assets				985	1,095
Common stock dividends accrued, paid in subsequent quarter				286	247
Real estate acquired in settlement of loans				$ 478	$ 929