Investment Securities (Gross Unrealized Losses and Fair Value by Length of Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	$ 124,791	$ 134,172
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses	3,515	1,153
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value	41,846	34,837
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses	1,747	742
Available-for-sale securities, continuous unrealized loss position, fair value	166,637	169,009
Available-for-sale securities, continuous unrealized loss position, unrealized losses	5,262	1,895
Equity [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value		666
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses		8
Available-for-sale securities, continuous unrealized loss position, fair value		666
Available-for-sale securities, continuous unrealized loss position, unrealized losses		8
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	34,287	37,550
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses	702	453
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value	6,845	5,956
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses	156	44
Available-for-sale securities, continuous unrealized loss position, fair value	41,132	43,506
Available-for-sale securities, continuous unrealized loss position, unrealized losses	858	497
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, fair value	2,979
Held-to-maturity securities, continuous unrealized loss position, less than 12 Months, unrealized losses	20
Held-to-maturity securities, continuous unrealized loss position, more than 12 Months, fair value	1,756
Held-to-maturity securities, continuous unrealized loss position, more than 12 Months, unrealized losses	10
Held-to-maturity securities, continuous unrealized loss position, fair value	4,735
Held-to-maturity securities, continuous unrealized loss position, unrealized losses	30
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	90,504	96,622
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses	2,813	700
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value	35,001	28,215
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses	1,591	690
Available-for-sale securities, continuous unrealized loss position, fair value	125,505	124,837
Available-for-sale securities, continuous unrealized loss position, unrealized losses	$ 4,404	$ 1,390