Investment Securities (Gross Unrealized Losses and Fair Value by Length of Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands	Sep. 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	$ 68,632	$ 134,172
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses	2,263	1,153
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value	91,188	34,837
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses	3,408	742
Available-for-sale securities, continuous unrealized loss position, fair value	159,820	169,009
Available-for-sale securities, continuous unrealized loss position, unrealized losses	5,671	1,895
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	21
Held-to-maturity securities, continuous unrealized loss position, more than 12 Months, fair value	1,585
Held-to-maturity securities, continuous unrealized loss position, more than 12 Months, unrealized losses	50
Held-to-maturity securities, continuous unrealized loss position, fair value	4,564
Held-to-maturity securities, continuous unrealized loss position, unrealized losses	71
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	4,209	37,550
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses	16	453
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value	37,151	5,956
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses	851	44
Available-for-sale securities, continuous unrealized loss position, fair value	41,360	43,506
Available-for-sale securities, continuous unrealized loss position, unrealized losses	867	497
Held-to-maturity securities, continuous unrealized loss position, more than 12 Months, fair value	1,585
Held-to-maturity securities, continuous unrealized loss position, more than 12 Months, unrealized losses	50
Held-to-maturity securities, continuous unrealized loss position, fair value	1,585
Held-to-maturity securities, continuous unrealized loss position, unrealized losses	50
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
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	21
Held-to-maturity securities, continuous unrealized loss position, fair value	2,979
Held-to-maturity securities, continuous unrealized loss position, unrealized losses	21
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	64,423	96,622
Available-for-sale securities, continuous unrealized loss position, less than 12 Months, unrealized losses	2,247	700
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, fair value	54,037	28,215
Available-for-sale securities, continuous unrealized loss position, more than 12 Months, unrealized losses	2,557	690
Available-for-sale securities, continuous unrealized loss position, fair value	118,460	124,837
Available-for-sale securities, continuous unrealized loss position, unrealized losses	$ 4,804	$ 1,390