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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Securities available-for-sale [Abstract]
Amortized Cost	$ 4,089,976	$ 3,871,491
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	15,329	12,805
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	280,102	325,426
Fair Value	3,825,203	3,558,870
Available-for-sale, Amortized Cost [Abstract]
Due in one year or less	39,764
Due in one year to five years	192,878
Due in five years to ten years	725,958
Due after ten years	1,817,433
Mortgage-backed securities	1,127,326
Asset-backed securities	186,617
Amortized Cost	4,089,976	3,871,491
Available-for-sale, Fair Value [Abstract]
Due in one year or less	39,027
Due in one year to five years	198,742
Due in five years to ten years	665,002
Due after ten years	1,747,914
Mortgage-backed securities	1,002,208
Asset-backed securities	172,310
Fair Value	3,825,203	3,558,870
Securities held-to-maturity [Abstract]
Amortized Cost	3,055,535	3,080,658
Gross Unrealized Gains	5,903	2,268
Gross Unrealized Losses	272,725	337,980
Fair Value	2,788,713	2,744,946
Allowance for credit losses - securities held-to-maturity	(1,907)	(1,608)
HeldToMaturitySecurities, net of allowance for credit losses	3,053,628	3,079,050
Held-to-maturity, Amortized Cost [Abstract]
Due in one year or less	0
Due in one year to five years	417,781
Due in five years to ten years	133,425
Due after ten years	1,911,568
Mortgage-backed securities	393,567
Asset-backed securities	199,194
Amortized Cost	3,055,535	3,080,658
Held-to-maturity, Fair Value [Abstract]
Due in one year or less	0
Due in one year to five years	391,711
Due in five years to ten years	122,346
Due after ten years	1,730,023
Mortgage-backed securities	361,110
Asset-backed securities	183,523
Fair Value	2,788,713	2,744,946
U.S. Treasury securities
Securities available-for-sale [Abstract]
Amortized Cost	212,637	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	4,434	1,967
Fair Value	208,204	194,184
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	212,637	196,151
Available-for-sale, Fair Value [Abstract]
Fair Value	208,204	194,184
Securities held-to-maturity [Abstract]
Amortized Cost	90,636	92,738
Gross Unrealized Gains	0	0
Gross Unrealized Losses	5,308	6,472
Fair Value	85,328	86,266
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	90,636	92,738
Held-to-maturity, Fair Value [Abstract]
Fair Value	85,328	86,266
U.S. Government agency securities
Securities available-for-sale [Abstract]
Amortized Cost	457,346	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	31,141	36,318
Fair Value	426,205	396,157
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	457,346	432,475
Available-for-sale, Fair Value [Abstract]
Fair Value	426,205	396,157
Securities held-to-maturity [Abstract]
Amortized Cost	364,388	374,255
Gross Unrealized Gains	0	0
Gross Unrealized Losses	22,651	27,860
Fair Value	341,737	346,395
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	364,388	374,255
Held-to-maturity, Fair Value [Abstract]
Fair Value	341,737	346,395
Mortgage-backed securities
Securities available-for-sale [Abstract]
Amortized Cost	1,127,326	1,114,948
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	396	211
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	125,514	143,583
Fair Value	1,002,208	971,576
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	1,127,326	1,114,948
Available-for-sale, Fair Value [Abstract]
Fair Value	1,002,208	971,576
Securities held-to-maturity [Abstract]
Amortized Cost	393,567	413,119
Gross Unrealized Gains	1,047	52
Gross Unrealized Losses	33,504	41,593
Fair Value	361,110	371,578
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	393,567	413,119
Held-to-maturity, Fair Value [Abstract]
Fair Value	361,110	371,578
State and municipal securities
Securities available-for-sale [Abstract]
Amortized Cost	1,598,308	1,478,310
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	14,857	12,553
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	59,341	78,557
Fair Value	1,553,824	1,412,306
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	1,598,308	1,478,310
Available-for-sale, Fair Value [Abstract]
Fair Value	1,553,824	1,412,306
Securities held-to-maturity [Abstract]
Amortized Cost	1,919,770	1,927,778
Gross Unrealized Gains	4,809	2,216
Gross Unrealized Losses	186,649	233,564
Fair Value	1,737,930	1,696,430
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	1,919,770	1,927,778
Held-to-maturity, Fair Value [Abstract]
Fair Value	1,737,930	1,696,430
Asset-backed securities
Securities available-for-sale [Abstract]
Amortized Cost	186,617	134,386
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	21	0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	14,328	16,983
Fair Value	172,310	117,403
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	186,617	134,386
Available-for-sale, Fair Value [Abstract]
Fair Value	172,310	117,403
Securities held-to-maturity [Abstract]
Amortized Cost	199,194	184,241
Gross Unrealized Gains	47	0
Gross Unrealized Losses	15,718	18,573
Fair Value	183,523	165,668
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	199,194	184,241
Held-to-maturity, Fair Value [Abstract]
Fair Value	183,523	165,668
Corporate notes and other
Securities available-for-sale [Abstract]
Amortized Cost	507,742	515,221
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	54	41
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	45,344	48,018
Fair Value	462,452	467,244
Available-for-sale, Amortized Cost [Abstract]
Amortized Cost	507,742	515,221
Available-for-sale, Fair Value [Abstract]
Fair Value	462,452	467,244
Securities held-to-maturity [Abstract]
Amortized Cost	87,980	88,527
Gross Unrealized Gains	0	0
Gross Unrealized Losses	8,895	9,918
Fair Value	79,085	78,609
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost	87,980	88,527
Held-to-maturity, Fair Value [Abstract]
Fair Value	$ 79,085	$ 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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