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Equity Investments - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Jan. 01, 2018
Investment [Line Items]
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01		$ (188,000)
Equity investments without readily determinable fair values	$ 26,400,000
Equity investments without readily determinable fair values, impairment	0
Mutual funds
Investment [Line Items]
Equity investments without readily determinable fair values	21,500,000
Equity stock in other institutions
Investment [Line Items]
Equity investments without readily determinable fair values	1,900,000
Correspondent bank stock
Investment [Line Items]
Equity investments without readily determinable fair values	370,000
Community development financial institutions
Investment [Line Items]
Equity investments without readily determinable fair values	1,000,000
Community reinvestment act investments
Investment [Line Items]
Equity investments without readily determinable fair values	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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
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