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Investments - Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 362,462	$ 393,631
Gross unrealized gains	7,243	829
Gross unrealized losses	(388)	(6,115)
Estimated fair value	369,317	388,345
U.S. Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,298	1,999
Gross unrealized gains	16
Gross unrealized losses		(28)
Estimated fair value	2,314	1,971
U.S. Federal Agency Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	4,015	10,370
Gross unrealized gains	98	32
Gross unrealized losses		(41)
Estimated fair value	4,113	10,361
Municipal Obligations, Tax Exempt [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	149,193	161,529
Gross unrealized gains	3,565	353
Gross unrealized losses	(80)	(2,770)
Estimated fair value	152,678	159,112
Municipal Obligations, Taxable [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	47,479	53,178
Gross unrealized gains	1,620	180
Gross unrealized losses	(2)	(323)
Estimated fair value	49,097	53,035
Agency Mortgage-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	156,134	158,765
Gross unrealized gains	1,944	264
Gross unrealized losses	(306)	(2,953)
Estimated fair value	157,772	156,076
Certificates of Deposit [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	3,343	7,790
Gross unrealized gains
Gross unrealized losses
Estimated fair value	$ 3,343	$ 7,790

X

- Definition

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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