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Securities (Details 2) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	$ 140,278	$ 506,824
Unrealized Losses, Less Than 12 Months	(8,909)	(80,411)
Fair Value, 12 Months or Longer	1,053,436	728,881
Unrealized Losses, 12 Months or Longer	(311,523)	(186,354)
Fair Value, Total	1,193,714	1,235,705
Unrealized Losses, Total	(320,432)	(266,765)
U.S. Treasury and U.S. government sponsored entities
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	5,381	52,311
Unrealized Losses, Less Than 12 Months	(174)	(5,835)
Fair Value, 12 Months or Longer	115,930	75,685
Unrealized Losses, 12 Months or Longer	(23,910)	(15,781)
Fair Value, Total	121,311	127,996
Unrealized Losses, Total	(24,084)	(21,616)
State and political subdivisions
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	94,185	306,709
Unrealized Losses, Less Than 12 Months	(7,325)	(56,650)
Fair Value, 12 Months or Longer	396,362	191,584
Unrealized Losses, 12 Months or Longer	(140,080)	(65,241)
Fair Value, Total	490,547	498,293
Unrealized Losses, Total	(147,405)	(121,891)
Corporate bonds
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	11,962	2,893
Unrealized Losses, Less Than 12 Months	(429)	(122)
Fair Value, 12 Months or Longer	3,804	986
Unrealized Losses, 12 Months or Longer	(264)	(180)
Fair Value, Total	15,766	3,879
Unrealized Losses, Total	(693)	(302)
Mortgage-backed securities - residential
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	5,170	101,476
Unrealized Losses, Less Than 12 Months	(179)	(13,545)
Fair Value, 12 Months or Longer	489,871	453,233
Unrealized Losses, 12 Months or Longer	(141,426)	(104,109)
Fair Value, Total	495,041	554,709
Unrealized Losses, Total	(141,605)	(117,654)
Collateralized mortgage obligations
Investment securities with unrealized losses
Fair Value, Less Than 12 Months	23,580	42,140
Unrealized Losses, Less Than 12 Months	(802)	(4,137)
Fair Value, 12 Months or Longer	44,524	5,214
Unrealized Losses, 12 Months or Longer	(5,474)	(800)
Fair Value, Total	68,104	47,354
Unrealized Losses, Total	(6,276)	(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	2,945	2,179
Unrealized Losses, 12 Months or Longer	(369)	(243)
Fair Value, Total	2,945	3,474
Unrealized Losses, Total	$ (369)	$ (365)

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