Securities - Expected Maturity for Debt Securities, Available-for-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Amortized Cost
One Year or Less	$ 68,159
One to Five Years	570,231
Five to Ten Years	649,590
After Ten Years	218,673
Amortized Cost	1,506,653	$ 1,537,420
Fair Value
One Year or Less	66,192
One to Five Years	544,784
Five to Ten Years	577,651
After Ten Years	174,158
Fair Value	1,362,785	1,371,757
U.S. Treasuries and government agencies
Amortized Cost
One Year or Less	0
One to Five Years	59,546
Five to Ten Years	138,329
After Ten Years	0
Amortized Cost	197,875	198,154
Fair Value
One Year or Less	0
One to Five Years	55,500
Five to Ten Years	122,919
After Ten Years	0
Fair Value	178,419	174,993
Obligations of states and municipalities
Amortized Cost
One Year or Less	370
One to Five Years	10,947
Five to Ten Years	332,562
After Ten Years	204,017
Amortized Cost	547,896
Fair Value
One Year or Less	370
One to Five Years	10,204
Five to Ten Years	296,965
After Ten Years	160,823
Fair Value	468,362
Residential mortgage backed - agency
Amortized Cost
One Year or Less	42
One to Five Years	33,446
Five to Ten Years	23,503
After Ten Years	0
Amortized Cost	56,991	57,883
Fair Value
One Year or Less	42
One to Five Years	32,561
Five to Ten Years	20,067
After Ten Years	0
Fair Value	52,670	53,061
Residential mortgage backed - non-agency
Amortized Cost
One Year or Less	32,336
One to Five Years	209,368
Five to Ten Years	92,763
After Ten Years	14,656
Amortized Cost	349,123	365,983
Fair Value
One Year or Less	31,027
One to Five Years	198,301
Five to Ten Years	78,487
After Ten Years	13,335
Fair Value	321,150	339,295
Commercial mortgage backed - agency
Amortized Cost
One Year or Less	233
One to Five Years	52,796
Five to Ten Years	6,380
After Ten Years	0
Amortized Cost	59,409	61,810
Fair Value
One Year or Less	232
One to Five Years	51,524
Five to Ten Years	6,076
After Ten Years	0
Fair Value	57,832	59,933
Commercial mortgage backed - non-agency
Amortized Cost
One Year or Less	32,882
One to Five Years	152,507
Five to Ten Years	5,153
After Ten Years	0
Amortized Cost	190,542	191,709
Fair Value
One Year or Less	32,283
One to Five Years	146,728
Five to Ten Years	4,214
After Ten Years	0
Fair Value	183,225	183,299
Asset-backed
Amortized Cost
One Year or Less	2,296
One to Five Years	51,621
Five to Ten Years	41,400
After Ten Years	0
Amortized Cost	95,317	101,791
Fair Value
One Year or Less	2,238
One to Five Years	49,966
Five to Ten Years	40,395
After Ten Years	0
Fair Value	92,599	98,626
Other
Amortized Cost
One Year or Less	0
One to Five Years	0
Five to Ten Years	9,500
After Ten Years	0
Amortized Cost	9,500	9,500
Fair Value
One Year or Less	0
One to Five Years
Five to Ten Years	8,528
After Ten Years	0
Fair Value	$ 8,528	$ 8,643