Securities - Schedule of Available-for-sale Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Available-for-sale securities
Fair Value, Less than 12 Months	$ 73,999	$ 428,669
Unrealized Losses, Less than 12 Months	2,495	30,152
Fair Value, 12 Months or Longer	1,393,557	1,160,723
Unrealized Losses, 12 Months or Longer	217,563	206,692
Fair Value	1,467,556	1,589,392
Unrealized Losses	220,058	236,844
U.S. Treasuries
Available-for-sale securities
Fair Value, Less than 12 Months	0	28,602
Unrealized Losses, Less than 12 Months	0	2,132
Fair Value, 12 Months or Longer	168,094	138,649
Unrealized Losses, 12 Months or Longer	22,181	20,787
Fair Value	168,094	167,251
Unrealized Losses	22,181	22,919
Obligations of U.S. Government sponsored entities
Available-for-sale securities
Fair Value, Less than 12 Months	28,596	143,794
Unrealized Losses, Less than 12 Months	758	7,508
Fair Value, 12 Months or Longer	494,947	457,373
Unrealized Losses, 12 Months or Longer	68,393	72,517
Fair Value	523,543	601,167
Unrealized Losses	69,151	80,025
Obligations of U.S. states and political subdivisions
Available-for-sale securities
Fair Value, Less than 12 Months	26,104	46,638
Unrealized Losses, Less than 12 Months	756	2,385
Fair Value, 12 Months or Longer	55,842	33,435
Unrealized Losses, 12 Months or Longer	7,528	5,941
Fair Value	81,946	80,073
Unrealized Losses	8,284	8,326
U.S. Government agencies
Available-for-sale securities
Fair Value, Less than 12 Months	6,244	22,945
Unrealized Losses, Less than 12 Months	254	1,258
Fair Value, 12 Months or Longer	42,351	29,356
Unrealized Losses, 12 Months or Longer	5,665	4,813
Fair Value	48,595	52,301
Unrealized Losses	5,919	6,071
U.S. Government sponsored entities
Available-for-sale securities
Fair Value, Less than 12 Months	13,055	186,690
Unrealized Losses, Less than 12 Months	727	16,869
Fair Value, 12 Months or Longer	630,081	499,532
Unrealized Losses, 12 Months or Longer	113,538	102,512
Fair Value	643,136	686,222
Unrealized Losses	114,265	119,381
U.S. corporate debt securities
Available-for-sale securities
Fair Value, Less than 12 Months	0	0
Unrealized Losses, Less than 12 Months	0	0
Fair Value, 12 Months or Longer	2,242	2,378
Unrealized Losses, 12 Months or Longer	258	122
Fair Value	2,242	2,378
Unrealized Losses	$ 258	$ 122

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