Securities Available-for-Sale (Details) - Unrealized gains on investment securities - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Securities available-for-sale
Securities, Amortized Cost	$ 440,238	$ 419,947
Securities, Gross Unrealized Gains	4,246	1,297
Securities, Gross Unrealized Losses	(2,573)	(9,210)
Securities, Fair Value	441,911	412,034
Federal agency obligations [Member]
Securities available-for-sale
Securities, Amortized Cost	24,877	45,509
Securities, Gross Unrealized Gains	599	51
Securities, Gross Unrealized Losses	(15)	(605)
Securities, Fair Value	25,461	44,955
Residential mortgage pass-through securities [Member]
Securities available-for-sale
Securities, Amortized Cost	230,064	189,721
Securities, Gross Unrealized Gains	881	85
Securities, Gross Unrealized Losses	(1,403)	(4,602)
Securities, Fair Value	229,542	185,204
Commercial mortgage pass-through securities [Member]
Securities available-for-sale
Securities, Amortized Cost	5,748	3,919
Securities, Gross Unrealized Gains	78
Securities, Gross Unrealized Losses		(45)
Securities, Fair Value	5,826	3,874
Obligations of U.S. states and political subdivisions [Member]
Securities available-for-sale
Securities, Amortized Cost	142,521	141,496
Securities, Gross Unrealized Gains	2,417	1,091
Securities, Gross Unrealized Losses	(819)	(3,402)
Securities, Fair Value	144,119	139,185
Corporate bonds and notes [Member]
Securities available-for-sale
Securities, Amortized Cost	28,128	26,308
Securities, Gross Unrealized Gains	267	45
Securities, Gross Unrealized Losses	(278)	(540)
Securities, Fair Value	28,117	25,813
Asset-backed securities [Member]
Securities available-for-sale
Securities, Amortized Cost	7,802	9,685
Securities, Gross Unrealized Gains	2	22
Securities, Gross Unrealized Losses	(58)	(16)
Securities, Fair Value	7,746	9,691
Certificates of deposit [Member]
Securities available-for-sale
Securities, Amortized Cost	148	319
Securities, Gross Unrealized Gains	2	3
Securities, Gross Unrealized Losses
Securities, Fair Value	150	322
Other securities [Member]
Securities available-for-sale
Securities, Amortized Cost	950	2,990
Securities, Gross Unrealized Gains
Securities, Gross Unrealized Losses
Securities, Fair Value	$ 950	$ 2,990