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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Debt Securities Held to Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 2,391,026	$ 2,173,011
Gross Unrealized Gains	47,947	62,326
Gross Unrealized Losses	(25,612)	(7,725)
Fair Value	2,413,361	2,227,612
U.S. Treasury securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	68,031	68,126
Gross Unrealized Gains	6,148	7,358
Gross Unrealized Losses	0	0
Fair Value	74,179	75,484
U.S. government agency securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	5,659	6,222
Gross Unrealized Gains	136	291
Gross Unrealized Losses	0	0
Fair Value	5,795	6,513
Obligations of states and state agencies
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	254,991	262,762
Gross Unrealized Gains	6,390	8,060
Gross Unrealized Losses	(141)	(105)
Fair Value	261,240	270,717
Municipal bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	199,030	207,497
Gross Unrealized Gains	5,406	6,292
Gross Unrealized Losses	(2)	0
Fair Value	204,434	213,789
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	454,021	470,259
Gross Unrealized Gains	11,796	14,352
Gross Unrealized Losses	(143)	(105)
Fair Value	465,674	484,506
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,787,211	1,550,306
Gross Unrealized Gains	29,249	39,603
Gross Unrealized Losses	(18,719)	(254)
Fair Value	1,797,741	1,589,655
Trust preferred securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	37,354	37,348
Gross Unrealized Gains	52	50
Gross Unrealized Losses	(6,678)	(7,365)
Fair Value	30,728	30,033
Corporate and other debt securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	38,750	40,750
Gross Unrealized Gains	566	672
Gross Unrealized Losses	(72)	(1)
Fair Value	$ 39,244	$ 41,421

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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