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Securities (Details 2) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	$ 35,764	$ 506,824
Unrealized Losses, Less Than 12 Months	(827)	(80,411)
Fair Value, 12 Months or Longer	1,181,195	728,881
Unrealized Losses, 12 Months or Longer	(226,707)	(186,354)
Fair Value, Total	1,216,959	1,235,705
Unrealized Losses, Total	(227,534)	(266,765)
U.S. Treasury and U.S. government sponsored entities
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	0	52,311
Unrealized Losses, Less Than 12 Months	0	(5,835)
Fair Value, 12 Months or Longer	131,976	75,685
Unrealized Losses, 12 Months or Longer	(17,900)	(15,781)
Fair Value, Total	131,976	127,996
Unrealized Losses, Total	(17,900)	(21,616)
State and political subdivisions
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	31,898	306,709
Unrealized Losses, Less Than 12 Months	(744)	(56,650)
Fair Value, 12 Months or Longer	440,668	191,584
Unrealized Losses, 12 Months or Longer	(97,278)	(65,241)
Fair Value, Total	472,566	498,293
Unrealized Losses, Total	(98,022)	(121,891)
Corporate bonds
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	985	2,893
Unrealized Losses, Less Than 12 Months	(12)	(122)
Fair Value, 12 Months or Longer	4,114	986
Unrealized Losses, 12 Months or Longer	(263)	(180)
Fair Value, Total	5,099	3,879
Unrealized Losses, Total	(275)	(302)
Mortgage-backed securities - residential
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	81	101,476
Unrealized Losses, Less Than 12 Months	(1)	(13,545)
Fair Value, 12 Months or Longer	555,585	453,233
Unrealized Losses, 12 Months or Longer	(106,255)	(104,109)
Fair Value, Total	555,666	554,709
Unrealized Losses, Total	(106,256)	(117,654)
Collateralized mortgage obligations
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	2,800	42,140
Unrealized Losses, Less Than 12 Months	(70)	(4,137)
Fair Value, 12 Months or Longer	45,562	5,214
Unrealized Losses, 12 Months or Longer	(4,701)	(800)
Fair Value, Total	48,362	47,354
Unrealized Losses, Total	(4,771)	(4,937)
Small Business Administration
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	0	1,295
Unrealized Losses, Less Than 12 Months	0	(122)
Fair Value, 12 Months or Longer	3,290	2,179
Unrealized Losses, 12 Months or Longer	(310)	(243)
Fair Value, Total	3,290	3,474
Unrealized Losses, Total	$ (310)	$ (365)

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