Equity Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income/ (loss), beginning of period	$ (12,548)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	4,719	$ (11,358)	$ (1,349)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	190	(461)	(1,554)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	50	123	(115)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	(222)	(331)	(139)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	688	979	2,354
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	688	979	2,354
Net unrealized gain/ (loss) on securities available-for-sale	4,497	(11,689)	(1,488)
Change in unrealized gain/ (loss) on cash flow hedges, net of tax	878	518	800
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	50	123	(115)
Other comprehensive income/ (loss), net	5,425	(11,048)	(803)
Accumulated other comprehensive income/ (loss), end of period	(8,658)	(12,548)
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income/ (loss), beginning of period	(12,548)	(1,500)	(697)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	4,959	(11,696)	(3,018)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	466	648	2,215
Other comprehensive income/ (loss), net	5,425	(11,048)	(803)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	(1,535)
Accumulated other comprehensive income/ (loss), end of period	(8,658)	(12,548)	(1,500)
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gain/ (loss) on securities available-for-sale, net of tax, beginning of period	(11,194)	495	1,983
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	4,719	(11,358)	(1,349)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	(222)	(331)	(139)
Net unrealized gain/ (loss) on securities available-for-sale	4,497	(11,689)	(1,488)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	(1,443)
Unrealized gain/ (loss) on securities available-for-sale, net of tax, end of period	(8,140)	(11,194)	495
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gain/ (loss) on cash flow hedges, net of tax, beginning of period	(605)	(1,123)	(1,923)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	190	(461)	(1,554)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	688	979	2,354
Change in unrealized gain/ (loss) on cash flow hedges, net of tax	878	518	800
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	59
Unrealized gain/ (loss) on cash flow hedges, net of tax, end of period	332	(605)	(1,123)
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gain/ (loss) on other, net of tax, beginning of period	(749)	(872)	(757)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	50	123	(115)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax	0	0	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	50	123	(115)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	(151)
Unrealized gain/ (loss) on other, net of tax, end of period	$ (850)	$ (749)	$ (872)