Debt Securities - Schedule of Available for Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities
Amortized Cost	$ 1,161,396	$ 780,061
Gross Unrealized Gains	28,602	8,359
Gross Unrealized Losses	2,543	2,443
Allowance for Credit Loss related to Debt Securities	0
Debt securities available for sale at fair value	1,187,455	785,977
U.S. Government agencies and corporations
Schedule of Available-for-sale Securities
Amortized Cost	402	439
Gross Unrealized Gains	8	2
Gross Unrealized Losses	0	0
Allowance for Credit Loss related to Debt Securities	0
Debt securities available for sale at fair value	410	441
State and political subdivisions
Schedule of Available-for-sale Securities
Amortized Cost	424,935	253,750
Gross Unrealized Gains	10,317	3,803
Gross Unrealized Losses	1,206	348
Allowance for Credit Loss related to Debt Securities	0
Debt securities available for sale at fair value	434,046	257,205
Mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized Cost	77,944	43,009
Gross Unrealized Gains	1,742	536
Gross Unrealized Losses	1	15
Allowance for Credit Loss related to Debt Securities	0
Debt securities available for sale at fair value	79,685	43,530
Collateralized mortgage obligations
Schedule of Available-for-sale Securities
Amortized Cost	352,318	293,911
Gross Unrealized Gains	8,148	1,000
Gross Unrealized Losses	438	1,965
Allowance for Credit Loss related to Debt Securities	0
Debt securities available for sale at fair value	360,028	292,946
Corporate debt securities
Schedule of Available-for-sale Securities
Amortized Cost	305,797	188,952
Gross Unrealized Gains	8,387	3,018
Gross Unrealized Losses	898	115
Allowance for Credit Loss related to Debt Securities	0
Debt securities available for sale at fair value	$ 313,286	$ 191,855

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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Amount, before tax, of unrealized loss 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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Amortized cost of 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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Amount of 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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Amount of allowance for credit loss 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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