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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	$ 467,508	$ 488,059
Gross Unrealized Gains	5,540	13,960
Gross Unrealized Losses	(2,949)	(496)
Allowance for Credit Losses	449	449
Fair Value	470,099	501,523
Total securities held-to-maturity, net	467,059	487,610
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	930,454	882,682
Gross Unrealized Gains	20,962	30,104
Gross Unrealized Losses	(5,756)	(357)
Fair Value	945,660	912,429
Obligations of U.S. Government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	23,484	14,978
Gross Unrealized Gains	137	186
Gross Unrealized Losses	(176)	(3)
Fair Value	23,445	15,161
Obligations of states and political subdivisions
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	244,030	248,324
Gross Unrealized Gains	900	2,814
Gross Unrealized Losses	(2,491)	0
Fair Value	242,439	251,138
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	404,087	335,271
Gross Unrealized Gains	3,132	8,994
Gross Unrealized Losses	(3,662)	(33)
Fair Value	403,557	344,232
Agency mortgage-backed securities
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	96,777	112,742
Gross Unrealized Gains	1,432	2,295
Gross Unrealized Losses	(458)	(496)
Fair Value	97,751	114,541
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	477,151	506,703
Gross Unrealized Gains	16,841	20,190
Gross Unrealized Losses	(1,911)	(321)
Fair Value	492,081	526,572
U.S. Treasury bills
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	10,982	10,980
Gross Unrealized Gains	427	486
Gross Unrealized Losses	0	0
Fair Value	11,409	11,466
Corporate debt securities
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	126,701	126,993
Gross Unrealized Gains	3,208	8,851
Gross Unrealized Losses	0	0
Fair Value	129,909	135,844
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	14,750	14,750
Gross Unrealized Gains	425	248
Gross Unrealized Losses	(7)	0
Fair Value	$ 15,168	$ 14,998

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