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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 488,059	$ 181,166
Gross Unrealized Gains	13,960	973
Gross Unrealized Losses	(496)	(200)
Fair Value	501,523	181,939
Debt Securities, Held-to-maturity, Allowance for Credit Loss	449
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	882,682	1,115,323
Gross Unrealized Gains	30,104	21,548
Gross Unrealized Losses	(357)	(1,554)
Fair Value	912,429	1,135,317
debt securities, held to maturity, net of alloawance for credit losses	487,610	181,166
Corporate Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	126,993	123,116
Gross Unrealized Gains	8,851	128
Gross Unrealized Losses	0	(200)
Fair Value	135,844	123,044
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,750
Gross Unrealized Gains	248
Gross Unrealized Losses	0
Fair Value	14,998
Obligations of U.S. Government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,978	9,954
Gross Unrealized Gains	186	92
Gross Unrealized Losses	(3)	0
Fair Value	15,161	10,046
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	248,324	11,704
Gross Unrealized Gains	2,814	170
Gross Unrealized Losses	0	0
Fair Value	251,138	11,874
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	335,271	207,269
Gross Unrealized Gains	8,994	6,118
Gross Unrealized Losses	(33)	(363)
Fair Value	344,232	213,024
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	112,742	46,346
Gross Unrealized Gains	2,295	675
Gross Unrealized Losses	(496)	0
Fair Value	114,541	47,021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	506,703	888,129
Gross Unrealized Gains	20,190	15,083
Gross Unrealized Losses	(321)	(1,191)
Fair Value	526,572	902,021
US Treasury Bill Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,980	9,971
Gross Unrealized Gains	486	255
Gross Unrealized Losses	0	0
Fair Value	$ 11,466	$ 10,226

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