Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Commitments and Contingencies Disclosure [Line Items]
Operating leases rental expense	$ 1.0	$ 1.0	$ 2.1	$ 2.0
Minimum [Member]
Commitments and Contingencies Disclosure [Line Items]
Lease expiration period			1 month
Lease expiration period, renewal option			3 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	$ 7.2		$ 7.2		$ 6.3