Securities, AFS Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	Jun. 30, 2024 USD ($) Position	Dec. 31, 2023 USD ($) Position
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 33,951	$ 2,765
12 months or longer	1,357,437	1,422,826
Total	1,391,388	1,425,591
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(156)	(82)
12 months or longer	(187,886)	(184,185)
Total	$ (188,042)	$ (184,267)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	12	10
12 months or longer | Position	380	378
Total | Position	392	388
AIR on AFS debt securities	$ 4,000	$ 3,900
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
U.S. Treasury [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 4,976	$ 0
12 months or longer	115,324	125,024
Total	120,300	125,024
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(6)	0
12 months or longer	(8,260)	(8,278)
Total	$ (8,266)	$ (8,278)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	1	0
12 months or longer | Position	7	8
Total | Position	8	8
Federal Agency [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 0	$ 0
12 months or longer	214,326	214,740
Total	214,326	214,740
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	0	0
12 months or longer	(34,040)	(33,644)
Total	$ (34,040)	$ (33,644)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	0	0
12 months or longer | Position	16	16
Total | Position	16	16
State & Municipal [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 758	$ 0
12 months or longer	85,244	85,528
Total	86,002	85,528
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(7)	0
12 months or longer	(9,847)	(9,956)
Total	$ (9,854)	$ (9,956)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	1	0
12 months or longer | Position	66	66
Total | Position	67	66
Mortgage-Backed [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 284	$ 53
12 months or longer	391,446	421,259
Total	391,730	421,312
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(3)	(1)
12 months or longer	(53,286)	(51,565)
Total	$ (53,289)	$ (51,566)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	6	7
12 months or longer | Position	157	156
Total | Position	163	163
Collateralized Mortgage Obligations [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 26,485	$ 1,333
12 months or longer	510,558	536,678
Total	537,043	538,011
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(118)	(6)
12 months or longer	(76,001)	(73,351)
Total	$ (76,119)	$ (73,357)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	3	2
12 months or longer | Position	120	118
Total | Position	123	120
Corporate [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 1,448	$ 1,379
12 months or longer	40,539	39,597
Total	41,987	40,976
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(22)	(75)
12 months or longer	(6,452)	(7,391)
Total	$ (6,474)	$ (7,466)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	1	1
12 months or longer | Position	14	14
Total | Position	15	15