Investment Securities, Contractual and Expected Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Maturity in years [Abstract]
Due in one year or less	$ 35,743
Due after one year through five years	59,496
Due after five years through ten years	16,155
Due after ten years	11,109
Subtotal	122,503
MBS & CMO	218,203
Amortized cost	340,706	$ 320,062
Maturity in years [Abstract]
Due in one year or less	35,848
Due after one year through five years	60,374
Due after five years through ten years	16,564
Due after ten years	11,412
Subtotal	124,198
MBS & CMO	218,699
Estimated fair value	$ 342,897	$ 314,637