Investment Securities Contractual Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Due in one year or less, amortized cost	$ 2,000
Due after one year through five years, amortized cost	19,967
Due after five years through ten years, amortized cost	69,079
Due after ten years, amortized cost	44,327
Subtotal before securities without single maturities, amortized cost	135,373
Collateralized mortgage obligations and mortgage-backed and asset-backed securities, amortized cost	272,092
Investment securities available for sale, amortized cost	407,465	$ 464,589
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Due in one year or less, fair value	2,001
Due after one year through five years, fair value	19,979
Due after five years through ten years, fair value	68,432
Due after ten years, fair value	46,066
Subtotal before securities without single maturities, fair value	136,478
Collateralized mortgage obligations and mortgage-backed and asset-backed securities, fair value	273,893
Investment securities available for sale, fair value	$ 410,371	$ 453,758