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Investment Securities - Schedule of Amortized Cost, Gross Unrealized Gains and Losses, and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Available-for-Sale:
Available-for-Sale: Amortized Cost	$ 4,362,585	$ 3,721,636
Available-for-Sale: Gross Unrealized Gains	33,784	72,428
Available-for-Sale: Gross Unrealized Losses	(42,849)	(2,375)
Available-for-Sale: Fair Value	4,353,520	3,791,689
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	4,899,880	3,262,727
Held-to-Maturity: Gross Unrealized Gains	42,808	86,494
Held-to-Maturity: Gross Unrealized Losses	(46,925)	(528)
Held-to-Maturity: Fair Value	4,895,763	3,348,693
Debt Securities Issued by the U.S. Treasury and Government Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	143,409	174,409
Available-for-Sale: Gross Unrealized Gains	1,561	427
Available-for-Sale: Gross Unrealized Losses	(106)	(591)
Available-for-Sale: Fair Value	144,864	174,245
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	131,465	7,500
Held-to-Maturity: Gross Unrealized Gains	277	8
Held-to-Maturity: Gross Unrealized Losses	(184)	(8)
Held-to-Maturity: Fair Value	131,558	7,500
Debt Securities Issued by States and Political Subdivisions
Available-for-Sale:
Available-for-Sale: Amortized Cost	20,231	23,540
Available-for-Sale: Gross Unrealized Gains	839	1,301
Available-for-Sale: Gross Unrealized Losses	(2)	(1)
Available-for-Sale: Fair Value	21,068	24,840
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	33,254	33,763
Held-to-Maturity: Gross Unrealized Gains	125	741
Held-to-Maturity: Fair Value	33,379	34,504
Debt Securities Issued by Government-Sponsored Enterprises
Available-for-Sale:
Available-for-Sale: Amortized Cost	1,509	985
Available-for-Sale: Gross Unrealized Gains	47	77
Available-for-Sale: Gross Unrealized Losses	(1)	0
Available-for-Sale: Fair Value	1,555	1,062
Debt Securities Issued by Corporations
Available-for-Sale:
Available-for-Sale: Amortized Cost	385,787	220,717
Available-for-Sale: Gross Unrealized Gains	3,630	4,844
Available-for-Sale: Gross Unrealized Losses	(1,543)	(956)
Available-for-Sale: Fair Value	387,874	224,605
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	21,133	12,031
Held-to-Maturity: Gross Unrealized Gains	140	251
Held-to-Maturity: Gross Unrealized Losses	(271)
Held-to-Maturity: Fair Value	21,002	12,282
Residential - Government Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	1,410,231	1,561,603
Available-for-Sale: Gross Unrealized Gains	15,435	33,657
Available-for-Sale: Gross Unrealized Losses	(8,483)	(445)
Available-for-Sale: Fair Value	1,417,183	1,594,815
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	1,877,804	917,459
Held-to-Maturity: Gross Unrealized Gains	18,683	30,580
Held-to-Maturity: Gross Unrealized Losses	(14,525)	(29)
Held-to-Maturity: Fair Value	1,881,962	948,010
Residential - U.S. Government-Sponsored Enterprises
Available-for-Sale:
Available-for-Sale: Amortized Cost	2,223,697	1,497,353
Available-for-Sale: Gross Unrealized Gains	8,395	21,254
Available-for-Sale: Gross Unrealized Losses	(32,040)	(324)
Available-for-Sale: Fair Value	2,200,052	1,518,283
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	2,371,155	2,099,053
Held-to-Maturity: Gross Unrealized Gains	22,683	51,735
Held-to-Maturity: Gross Unrealized Losses	(24,397)	(291)
Held-to-Maturity: Fair Value	2,369,441	2,150,497
Commercial - Government Agencies
Available-for-Sale:
Available-for-Sale: Amortized Cost	177,721	243,029
Available-for-Sale: Gross Unrealized Gains	3,877	10,868
Available-for-Sale: Gross Unrealized Losses	(674)	(58)
Available-for-Sale: Fair Value	180,924	253,839
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	465,069	192,921
Held-to-Maturity: Gross Unrealized Gains	900	3,179
Held-to-Maturity: Gross Unrealized Losses	(7,548)	(200)
Held-to-Maturity: Fair Value	458,421	195,900
Mortgage-Backed Securities
Available-for-Sale:
Available-for-Sale: Amortized Cost	3,811,649	3,301,985
Available-for-Sale: Gross Unrealized Gains	27,707	65,779
Available-for-Sale: Gross Unrealized Losses	(41,197)	(827)
Available-for-Sale: Fair Value	3,798,159	3,366,937
Held-to-Maturity:
Held-to-Maturity: Amortized Cost	4,714,028	3,209,433
Held-to-Maturity: Gross Unrealized Gains	42,266	85,494
Held-to-Maturity: Gross Unrealized Losses	(46,470)	(520)
Held-to-Maturity: Fair Value	$ 4,709,824	$ 3,294,407

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