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, 2026 USD ($) Security	Dec. 31, 2025 USD ($) Security
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	69	16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 557,014	$ 139,615
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (5,217)	$ (836)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	542	576
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 1,553,262	$ 1,730,263
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(261,336)	(247,014)
Debt Securities, Available-for-sale, Unrealized Loss Position	2,110,276	1,869,878
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (266,553)	$ (247,850)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	8	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 226,842	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (2,410)	$ 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	178	180
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	$ 979,634	$ 1,008,554
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(163,877)	(163,285)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	1,206,476	1,008,554
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (166,287)	$ (163,285)
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	35	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 76,711	$ 10,532
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (2,115)	$ (127)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	252	277
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 710,096	$ 776,597
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(136,860)	(125,270)
Debt Securities, Available-for-sale, Unrealized Loss Position	786,807	787,129
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (138,975)	$ (125,397)
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	5	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 29,028	$ 22,911
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (248)	$ (329)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	18	21
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 117,244	$ 145,563
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(5,538)	(5,751)
Debt Securities, Available-for-sale, Unrealized Loss Position	146,272	168,474
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (5,786)	$ (6,080)
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	10	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 194,797	$ 19,806
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (870)	$ (128)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	72	72
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 70,818	$ 74,446
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(7,557)	(7,100)
Debt Securities, Available-for-sale, Unrealized Loss Position	265,615	94,252
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (8,427)	$ (7,228)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	4
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 164,403
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (1,638)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	164,403
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (1,638)
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	13	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 183,590	$ 34,766
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (1,299)	$ (97)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	72	75
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 194,320	$ 240,422
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(21,559)	(21,043)
Debt Securities, Available-for-sale, Unrealized Loss Position	377,910	275,188
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (22,858)	$ (21,140)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	3	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 27,987	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (287)	$ 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	118	120
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	$ 249,899	$ 275,497
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(44,591)	(44,093)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	277,886	275,497
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (44,878)	$ (44,093)
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	6	4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 72,888	$ 51,600
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (685)	$ (155)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	128	131
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 460,784	$ 493,235
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(89,822)	(87,850)
Debt Securities, Available-for-sale, Unrealized Loss Position	533,672	544,835
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (90,507)	$ (88,005)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Security	1	0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 34,452	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (485)	$ 0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Security	60	60
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	$ 729,735	$ 733,057
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	(119,286)	(119,192)
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value	764,187	733,057
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss	$ (119,771)	$ (119,192)