Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Commitments and Contingencies Disclosure [Line Items]
Operating leases rental expense	$ 1,100	$ 973
Minimum [Member]
Commitments and Contingencies Disclosure [Line Items]
Lease expiration period	1 month
Lease expiration period, renewal option	6 months
Maximum [Member]
Commitments and Contingencies Disclosure [Line Items]
Lease expiration period	24 years
Lease expiration period, renewal option	5 years
Commitments to extend credit on standby letters of credit [Member] | Commitments to Extend Credit [Member]
Commitments and Contingencies Disclosure [Line Items]
Contract amount	$ 7,084		$ 6,250