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Investment Securities - Realized gains and losses (Details) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Available-for-Sale Securities
Proceeds from sales or calls	$ 246,824	$ 228,405	$ 167,163
Gross realized gains from sales or calls	1,976	4,701	2,223
Gross realized losses from sales or calls	(662)	(1,899)	(999)
Held-to-Maturity Securities
Proceeds from calls	0	0	9,257
Gross realized gains from sales or calls	$ 0	$ 0	$ 696

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Amount of gain (loss) on sale of investment in debt security measured at amortized cost (held-to-maturity), including other-than-temporary impairment (OTTI).

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Amount of cash inflow from the sale or maturity of long-term held-to-maturity securities.

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Amount of cash inflow from sale 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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