Investment Securities Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in a Continuous Unrealized Loss Position (Details) $ in Thousands	Mar. 31, 2023 USD ($) Security	Dec. 31, 2022 USD ($) Security
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	295	719
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 826,211	$ 2,108,595
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (32,447)	$ (256,382)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	432	63
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 1,716,919	$ 477,373
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(272,077)	(89,665)
Debt Securities, Available-for-sale, Unrealized Loss Position	2,543,130	2,585,968
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (304,524)	$ (346,047)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	126	127
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 495,868	$ 504,922
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (29,253)	$ (38,304)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	54	53
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	$ 629,159	$ 620,127
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(153,432)	(157,903)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	1,125,027	1,125,049
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (182,685)	$ (196,207)
US Government Debt Securities
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	1	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 97,566	$ 96,906
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (2,210)	$ (2,814)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	2	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 122,487	$ 121,579
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(3,581)	(4,841)
Debt Securities, Available-for-sale, Unrealized Loss Position	220,053	218,485
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (5,791)	$ (7,655)
US Government Agencies Debt Securities
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	1	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,017	$ 1,008
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (30)	$ (42)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	1,017	1,008
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (30)	$ (42)
State and Municipal Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	86	360
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 238,922	$ 995,122
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (6,326)	$ (157,397)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	258	29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 735,187	$ 61,089
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(138,884)	(21,419)
Debt Securities, Available-for-sale, Unrealized Loss Position	974,109	1,056,211
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (145,210)	$ (178,816)
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	45	66
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 239,873	$ 376,398
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (13,138)	$ (31,333)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	27	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 196,406	$ 37,157
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(22,880)	(6,150)
Debt Securities, Available-for-sale, Unrealized Loss Position	436,279	413,555
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (36,018)	$ (37,483)
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	37	96
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 29,944	$ 113,191
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (1,499)	$ (7,650)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	59	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 100,506	$ 20,842
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(9,638)	(5,472)
Debt Securities, Available-for-sale, Unrealized Loss Position	130,450	134,033
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (11,137)	$ (13,122)
Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	50	81
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 80,524	$ 154,861
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (4,743)	$ (18,301)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	25	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 129,035	$ 55,293
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(21,491)	(11,546)
Debt Securities, Available-for-sale, Unrealized Loss Position	209,559	210,154
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (26,234)	$ (29,847)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	106	106
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 238,862	$ 246,667
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (11,981)	$ (14,275)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	14	14
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	$ 153,491	$ 153,178
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(40,097)	(43,205)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	392,353	399,845
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (52,078)	$ (57,480)
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	75	114
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 138,365	$ 371,109
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (4,501)	$ (38,845)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	61	20
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 433,298	$ 181,413
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(75,603)	(40,237)
Debt Securities, Available-for-sale, Unrealized Loss Position	571,663	552,522
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (80,104)	$ (79,082)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	20	21
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 257,006	$ 258,255
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (17,272)	$ (24,029)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	40	39
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	$ 475,668	$ 466,949
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(113,335)	(114,698)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	732,674	725,204
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (130,607)	$ (138,727)