Investment Securities - Portfolio of Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 421,482	$ 443,928
Unrealized Gains	5,842	1,795
Unrealized Losses	1,686	7,969
Fair Value	425,638	437,754
U.S. Agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,867	3,016
Unrealized Gains	175	56
Unrealized Losses	0	0
Fair Value	3,042	3,072
State, county, and municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,233	44,639
Unrealized Gains	500	214
Unrealized Losses	0	765
Fair Value	12,733	44,088
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	395,814	370,706
Unrealized Gains	4,965	1,092
Unrealized Losses	700	5,921
Fair Value	400,079	365,877
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,568	25,567
Unrealized Gains	202	433
Unrealized Losses	986	1,283
Fair Value	$ 9,784	$ 24,717

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).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

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