Securities, HTM Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023 USD ($) Position	Dec. 31, 2022 USD ($) Position
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 169,276	$ 393,788
12 months or longer	561,122	349,496
Total	730,398	743,284
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(4,762)	(27,889)
12 months or longer	(89,822)	(79,190)
Total	$ (94,584)	$ (107,079)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	99	217
12 months or longer | Position	202	101
Total | Position	301	318
HTM debt securities, nonaccrual	$ 0	$ 0
Accrued interest reversed against interest income	0	0
Collateral-dependent HTM debt securities	0	0
AIR on HTM debt securities	$ 3,800	$ 3,800
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Past Due [Member]
Unrealized Loss Position, Number of Positions [Abstract]
HTM debt securities	$ 0	$ 0
Federal Agency [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	0	0
12 months or longer	80,945	79,322
Total	80,945	79,322
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	0	0
12 months or longer	(19,055)	(20,678)
Total	$ (19,055)	$ (20,678)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	0	0
12 months or longer | Position	4	4
Total | Position	4	4
Mortgage-Backed [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 28,642	$ 91,417
12 months or longer	199,125	138,936
Total	227,767	230,353
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(1,033)	(9,096)
12 months or longer	(33,160)	(28,342)
Total	$ (34,193)	$ (37,438)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	7	21
12 months or longer | Position	27	13
Total | Position	34	34
Collateralized Mortgage Obligations [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 87,826	$ 191,644
12 months or longer	149,636	48,289
Total	237,462	239,933
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(3,168)	(13,863)
12 months or longer	(18,719)	(10,855)
Total	$ (21,887)	$ (24,718)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	17	47
12 months or longer | Position	37	8
Total | Position	54	55
State & Municipal [Member]
Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months	$ 52,808	$ 110,727
12 months or longer	131,416	82,949
Total	184,224	193,676
Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	(561)	(4,930)
12 months or longer	(18,888)	(19,315)
Total	$ (19,449)	$ (24,245)
Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months | Position	75	149
12 months or longer | Position	134	76
Total | Position	209	225
US Government Agencies Debt Securities and US Government-sponsored Enterprises Debt Securities [Member]
Unrealized Loss Position, Number of Positions [Abstract]
Held-to-maturity debt securities, percentage	70.00%	70.00%