Investment Securities (Investments Classified by Contractual Maturity Date) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Available for sale Securities, Amortized Cost, Due in 1 year or less	$ 10,428
Available for sale Securities, Amortized Cost, Due after 1 year but within 5 years	12,758
Available for sale Securities, Amortized Cost, Due after 5 years but within 10 years	48,223
Available for sale Securities, Amortized Cost, Due after 10 years	10,265
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Total	81,674
Available-for-sale securities, Amortized Cost	127,384
Available for sale Securities, Fair Value, Due in 1 year or less	10,453
Available for sale Securities, Fair Value, Due after 1 year but within 5 years	12,414
Available for sale Securities, Fair Value, Due after 5 years but within 10 years	45,478
Available for sale Securities, Fair Value, Due after 10 years	9,358
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value, Total	77,703
Available for sale Securities, Fair Value	122,342	$ 92,959
Held-to-maturity, Due in 1 year or less, Amortized Cost	2,001
Held-to-maturity, Due after 1 year through 5 years, Amortized Cost	10,025
Held-to-maturity, Due after 5 years through 10 years, Amortized Cost	46,560
Held-to-maturity, Due after 10 years, Amortized Cost	2,806
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	61,392
Held-to-maturity debt securities, Amortized Cost	131,293	101,356
Held-to-maturity, Due in 1 year or less, Fair Value	1,988
Held-to-maturity, Due after 1 year through 5, Fair Value	9,859
Held-to-maturity, Due after 5 years through 10 years, Fair Value	45,162
Held-to-maturity, Due after 10 years, Fair Value	2,768
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value	59,777
Held-to-maturity, Fair Value	128,352	$ 100,483
Mortgage-backed securities [Member]
Schedule of Investments [Line Items]
Available for sale Securities without a Single Maturity Date, Amortized Cost	45,710
Available for sale securities without a Single Maturity Date, Fair Value	44,639
Held-to-maturity without Single Maturity Date, Amortized Cost	69,901
Held-to-maturity without Single Maturity Date, Fair Value	$ 68,575

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant