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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Securities available-for-sale [Abstract]
Amortized Cost	$ 3,854,009	$ 3,871,491
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	25,463	12,805
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	288,192	325,426
Fair Value	3,591,280	3,558,870
Available-for-sale, Amortized Cost [Abstract]
Due in one year or less	11,051
Due in one year to five years	122,244
Due in five years to ten years	674,899
Due after ten years	1,780,404
Mortgage-backed securities	1,087,782
Asset-backed securities	177,629
Amortized Cost	3,854,009	3,871,491
Available-for-sale, Fair Value [Abstract]
Due in one year or less	12,204
Due in one year to five years	131,874
Due in five years to ten years	609,675
Due after ten years	1,726,292
Mortgage-backed securities	949,374
Asset-backed securities	161,861
Fair Value	3,591,280	3,558,870
Securities held-to-maturity [Abstract]
Amortized Cost	3,033,885	3,080,658
Gross Unrealized Gains	4,274	2,268
Gross Unrealized Losses	292,104	337,980
Fair Value	2,746,055	2,744,946
Allowance for credit losses - securities held-to-maturity	1,708	1,608
HeldToMaturitySecurities, net of allowance for credit losses	3,032,177	3,079,050
Held-to-maturity, Amortized Cost [Abstract]
Due in one year or less	0
Due in one year to five years	417,617
Due in five years to ten years	133,168
Due after ten years	1,894,026
Mortgage-backed securities	390,269
Asset-backed securities	198,805
Amortized Cost	3,033,885	3,080,658
Held-to-maturity, Fair Value [Abstract]
Due in one year or less	0
Due in one year to five years	387,461
Due in five years to ten years	120,335
Due after ten years	1,706,566
Mortgage-backed securities	351,441
Asset-backed securities	180,252
Fair Value	2,746,055	2,744,946
U.S. Treasury securities
Securities available-for-sale [Abstract]
Amortized Cost	209,688	196,151
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	1	0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	1,076	1,967
Fair Value	208,613	194,184
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	209,688	196,151
Available-for-sale, Fair Value [Abstract]
Fair Value	208,613	194,184
Securities held-to-maturity [Abstract]
Amortized Cost	90,526	92,738
Gross Unrealized Gains	0	0
Gross Unrealized Losses	5,964	6,472
Fair Value	84,562	86,266
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	90,526	92,738
Held-to-maturity, Fair Value [Abstract]
Fair Value	84,562	86,266
U.S. Government agency securities
Securities available-for-sale [Abstract]
Amortized Cost	307,438	432,475
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	25,384	36,318
Fair Value	282,054	396,157
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	307,438	432,475
Available-for-sale, Fair Value [Abstract]
Fair Value	282,054	396,157
Securities held-to-maturity [Abstract]
Amortized Cost	364,513	374,255
Gross Unrealized Gains	0	0
Gross Unrealized Losses	26,900	27,860
Fair Value	337,613	346,395
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	364,513	374,255
Held-to-maturity, Fair Value [Abstract]
Fair Value	337,613	346,395
Mortgage-backed securities
Securities available-for-sale [Abstract]
Amortized Cost	1,087,782	1,114,948
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	191	211
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	138,599	143,583
Fair Value	949,374	971,576
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	1,087,782	1,114,948
Available-for-sale, Fair Value [Abstract]
Fair Value	949,374	971,576
Securities held-to-maturity [Abstract]
Amortized Cost	390,269	413,119
Gross Unrealized Gains	562	52
Gross Unrealized Losses	39,390	41,593
Fair Value	351,441	371,578
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	390,269	413,119
Held-to-maturity, Fair Value [Abstract]
Fair Value	351,441	371,578
State and municipal securities
Securities available-for-sale [Abstract]
Amortized Cost	1,580,228	1,478,310
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	25,238	12,553
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	58,826	78,557
Fair Value	1,546,640	1,412,306
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	1,580,228	1,478,310
Available-for-sale, Fair Value [Abstract]
Fair Value	1,546,640	1,412,306
Securities held-to-maturity [Abstract]
Amortized Cost	1,902,318	1,927,778
Gross Unrealized Gains	3,712	2,216
Gross Unrealized Losses	191,339	233,564
Fair Value	1,714,691	1,696,430
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	1,902,318	1,927,778
Held-to-maturity, Fair Value [Abstract]
Fair Value	1,714,691	1,696,430
Asset-backed securities
Securities available-for-sale [Abstract]
Amortized Cost	177,629	134,386
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	15,768	16,983
Fair Value	161,861	117,403
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	177,629	134,386
Available-for-sale, Fair Value [Abstract]
Fair Value	161,861	117,403
Securities held-to-maturity [Abstract]
Amortized Cost	198,805	184,241
Gross Unrealized Gains	0	0
Gross Unrealized Losses	18,553	18,573
Fair Value	180,252	165,668
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	198,805	184,241
Held-to-maturity, Fair Value [Abstract]
Fair Value	180,252	165,668
Corporate notes and other
Securities available-for-sale [Abstract]
Amortized Cost	491,244	515,221
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	33	41
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	48,539	48,018
Fair Value	442,738	467,244
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	491,244	515,221
Available-for-sale, Fair Value [Abstract]
Fair Value	442,738	467,244
Securities held-to-maturity [Abstract]
Amortized Cost	87,454	88,527
Gross Unrealized Gains	0	0
Gross Unrealized Losses	9,958	9,918
Fair Value	77,496	78,609
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	87,454	88,527
Held-to-maturity, Fair Value [Abstract]
Fair Value	$ 77,496	$ 78,609

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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