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Equity Investment Securities - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01				$ (188,000)
Equity investments with readily determinable fair value	$ 48,750,000	$ 48,750,000	$ 49,835,000
Sale of Equity Investments with Readily Determinable Fair Values	2,600,000
Equity Securities, FV-NI, Gain (Loss)	0
Equity investments without readily determinable fair values	26,700,000	26,700,000	26,400,000
Equity investments without readily determinable fair values, impairment	0	0
Equity investments without readily determinable fair values, observable price changes	0	0
Mutual funds
Investment [Line Items]
Equity investments with readily determinable fair value	22,100,000	22,100,000	21,500,000
Equity stock in other institutions
Investment [Line Items]
Equity investments with readily determinable fair value			1,900,000
Correspondent bank stock
Investment [Line Items]
Equity investments without readily determinable fair values	370,000	370,000	370,000
Community development financial institutions
Investment [Line Items]
Equity investments without readily determinable fair values	1,000,000.0	1,000,000.0	1,000,000.0
Community reinvestment act investments
Investment [Line Items]
Equity investments without readily determinable fair values	$ 25,300,000	$ 25,300,000	25,100,000
Retained earnings
Investment [Line Items]
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01			$ (469,000)	$ (469,000)

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Equity Securities without Readily Determinable Fair Value, Upward (Downward) Price Adjustment, Annual Amount

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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