Investment Securities (Gross Unrealized Losses and Fair Value by Length of Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	$ 100,932	$ 112,803
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses	439	1,616
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value	14,084	9,208
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses	295	263
Available-for-sale securities, continuous unrealized loss position, fair value	115,016	122,011
Available-for-sale securities, continuous unrealized loss position, unrealized losses	734	1,879
Equity [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value		640
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses		12
Available-for-sale securities, continuous unrealized loss position, fair value		640
Available-for-sale securities, continuous unrealized loss position, unrealized losses		12
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	40,819	11,926
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses	150	58
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value	2,998
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses	4
Available-for-sale securities, continuous unrealized loss position, fair value	43,817	11,926
Available-for-sale securities, continuous unrealized loss position, unrealized losses	154	58
Mortgage-backed [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	60,113	100,237
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses	289	1,546
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value	11,086	9,208
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses	291	263
Available-for-sale securities, continuous unrealized loss position, fair value	71,199	109,445
Available-for-sale securities, continuous unrealized loss position, unrealized losses	$ 580	$ 1,809