Securities (Investment Securities in Unrealized Loss Position) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Securities [Line Items]
Investment securities available for sale, securities in a loss position for less than 12 Months, estimated fair value	$ 229,935	$ 96,572
Investment securities available for sale, securities in a loss position for less than 12 months, unrealized losses	(2,454)	(1,895)
Investment securities available for sale, securities in a loss position for 12 months or longer, estimated fair value	68,545	28,236
Investment securities available for sale, securities in a loss position for 12 months or longer, unrealized losses	(2,056)	(953)
Investment securities available-for-sale, estimated fair value	298,480	124,808
Investment securities available-for-sale, unrealized losses	4,510	2,848
Investment securities held-to-maturity, Securities in a loss Position for less than 12 Months, Estimated Fair Value	1,043	536
Investment securities held-to-maturity, Securities in a loss Position for less than 12 Months, Unrealized Losses	(3)	(19)
Investment securities held-to-maturity, Securities in a loss Position for 12 Months or Longer, Estimated Fair Value	529	0
Investment securities held-to-maturity, Securities in a loss Position for 12 Months or Longer, Unrealized Losses	(23)	0
Investment securities held-to-maturity, estimated fair value	1,572	536
Investment securities held-to-maturity, unrealized losses	26	19
Commercial Mortgage Backed Securities [Member]
Securities [Line Items]
Investment securities available for sale, securities in a loss position for less than 12 Months, estimated fair value	193,844	62,145
Investment securities available for sale, securities in a loss position for less than 12 months, unrealized losses	(1,531)	(541)
Investment securities available for sale, securities in a loss position for 12 months or longer, estimated fair value	43,190	19,768
Investment securities available for sale, securities in a loss position for 12 months or longer, unrealized losses	(1,084)	(623)
Investment securities available-for-sale, estimated fair value	237,034	81,913
Investment securities available-for-sale, unrealized losses	2,615	1,164
US Government Agencies Short-term Debt Securities [Member]
Securities [Line Items]
Investment securities available for sale, securities in a loss position for less than 12 Months, estimated fair value	5,066	4,994
Investment securities available for sale, securities in a loss position for less than 12 months, unrealized losses	(21)	(112)
Investment securities available for sale, securities in a loss position for 12 months or longer, estimated fair value	0	0
Investment securities available for sale, securities in a loss position for 12 months or longer, unrealized losses	0	0
Investment securities available-for-sale, estimated fair value	5,066	4,994
Investment securities available-for-sale, unrealized losses	21	112
Municipals [Member]
Securities [Line Items]
Investment securities available for sale, securities in a loss position for less than 12 Months, estimated fair value	15,096	28,147
Investment securities available for sale, securities in a loss position for less than 12 months, unrealized losses	(693)	(1,205)
Investment securities available for sale, securities in a loss position for 12 months or longer, estimated fair value	15,031	0
Investment securities available for sale, securities in a loss position for 12 months or longer, unrealized losses	(540)	0
Investment securities available-for-sale, estimated fair value	30,127	28,147
Investment securities available-for-sale, unrealized losses	1,233	1,205
Investment securities held-to-maturity, Securities in a loss Position for less than 12 Months, Estimated Fair Value	1,043	536
Investment securities held-to-maturity, Securities in a loss Position for less than 12 Months, Unrealized Losses	(3)	(19)
Investment securities held-to-maturity, Securities in a loss Position for 12 Months or Longer, Estimated Fair Value	529	0
Investment securities held-to-maturity, Securities in a loss Position for 12 Months or Longer, Unrealized Losses	(23)	0
Investment securities held-to-maturity, estimated fair value	1,572	536
Investment securities held-to-maturity, unrealized losses	26	19
Corporate Bond Securities [Member]
Securities [Line Items]
Investment securities available for sale, securities in a loss position for less than 12 Months, estimated fair value	2,630
Investment securities available for sale, securities in a loss position for less than 12 months, unrealized losses	(9)
Investment securities available for sale, securities in a loss position for 12 months or longer, estimated fair value	0
Investment securities available for sale, securities in a loss position for 12 months or longer, unrealized losses	0
Investment securities available-for-sale, estimated fair value	2,630
Investment securities available-for-sale, unrealized losses	9
Asset-backed Securities [Member]
Securities [Line Items]
Investment securities available for sale, securities in a loss position for less than 12 Months, estimated fair value	13,299	1,286
Investment securities available for sale, securities in a loss position for less than 12 months, unrealized losses	(200)	(37)
Investment securities available for sale, securities in a loss position for 12 months or longer, estimated fair value	8,945	7,077
Investment securities available for sale, securities in a loss position for 12 months or longer, unrealized losses	(311)	(221)
Investment securities available-for-sale, estimated fair value	22,244	8,363
Investment securities available-for-sale, unrealized losses	511	258
CRA Mutual Fund [Member]
Securities [Line Items]
Investment securities available for sale, securities in a loss position for less than 12 Months, estimated fair value	0	0
Investment securities available for sale, securities in a loss position for less than 12 months, unrealized losses	0	0
Investment securities available for sale, securities in a loss position for 12 months or longer, estimated fair value	1,379	1,391
Investment securities available for sale, securities in a loss position for 12 months or longer, unrealized losses	(121)	(109)
Investment securities available-for-sale, estimated fair value	1,379	1,391
Investment securities available-for-sale, unrealized losses	$ 121	$ 109

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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-Publisher FASB
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