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Securities Available-for-Sale (Details) - Investments classified by maturity date - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Securities Available-for-Sale:
Due in one year or less, amortized cost	$ 6,909
Due in one year or less, fair value	6,941
Due after one year through five years, amortized cost	46,300
Due after one year through five years, fair value	46,324
Due after five years through ten years, amortized cost	32,152
Due after five years through ten years, fair value	32,634
Due after ten years, amortized cost	169,416
Due after ten years, fair value	168,959
Total, amortized cost	518,902	$ 419,947
Total, fair value	516,539
Residential mortgage pass-through securities [Member]
Securities Available-for-Sale:
Total, amortized cost	255,657	189,721
Total, fair value	253,201
Commercial mortgage pass-through securities [Member]
Securities Available-for-Sale:
Total, amortized cost	6,903	3,919
Total, fair value	6,915
Other securities [Member]
Securities Available-for-Sale:
Total, amortized cost	1,565	$ 2,990
Total, fair value	$ 1,565

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