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Investment Securities - Realized gains and losses (Details) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Available-for-Sale Securities
Proceeds from sales or calls	$ 283,956	$ 281,906	$ 246,824
Gross realized gains from sales or calls	7,123	5,319	1,976
Gross realized losses from sales or calls	$ (2,871)	$ (120)	$ (662)

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

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- Definition

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