Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
us-gaap_AssetsAbstract
Cash and due from banks	$ 486,124	$ 190,314
Debt securities available for sale	3,699,318	3,999,801
Debt securities held to maturity, net of allowance for credit losses of $1 at June 30, 2024 and December 31, 2023 (Fair value of $817,071 at June 30, 2024 and $849,562 at December 31, 2023)	860,868	878,396
Loans	831,842	866,602
Allowance for credit losses on loans	(15,952)	(16,867)
Loans, net of allowance for credit losses on loans	815,890	849,735
Premises and equipment, net	26,275	27,016
Identifiable intangibles, net	234	347
Goodwill	121,673	121,673
Other assets	301,763	297,310
Total Assets	6,312,145	6,364,592
us-gaap_LiabilitiesAbstract
Noninterest-bearing deposits	2,459,467	2,605,844
Interest-bearing deposits	2,671,973	2,868,423
Total deposits	5,131,440	5,474,267
Bank Term Funding Program borrowings	200,000	0
Securities sold under repurchase agreements	100,167	58,162
Other liabilities	64,938	59,269
Total Liabilities	5,496,545	5,591,698
Shareholders' Equity:
Common stock (no par value), authorized: 150,000 shares issued and outstanding: 26,683 at June 30, 2024 and 26,671 at December 31, 2023	474,583	473,136
Deferred compensation	35	35
Accumulated other comprehensive loss	(197,300)	(190,282)
Retained earnings	538,282	490,005
Total Shareholders' Equity	815,600	772,894
Total Liabilities and Shareholders' Equity	$ 6,312,145	$ 6,364,592