Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss) at beginning period	$ (5,636)	$ (9,245)
Other comprehensive income (loss) before reclassifications	1,483	1,539
Amounts reclassified from AOCL	(49)	62
Other comprehensive income	1,434	1,601
Accumulated other comprehensive income at end of period	(4,202)	(7,644)
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total reclassification before tax	5,561	4,605
Interest expense	(1,461)	(1,805)
Tax expense (benefit)	1,780	1,467
Reclassification, net of tax	3,781	3,138
Unrealized Gains (Losses) on Available For Sale Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss) at beginning period	162	(3,200)
Other comprehensive income (loss) before reclassifications	1,483	1,539
Amounts reclassified from AOCL	(49)	0
Other comprehensive income	1,434	1,539
Accumulated other comprehensive income at end of period	1,596	(1,661)
Unrealized Gains (Losses) on Available For Sale Securities [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net gains on securities	75
Net impairment loss recognized in earnings	0
Total reclassification before tax	75
Tax expense (benefit)	26
Reclassification, net of tax	49
Disproportionate Tax Effects from Securities Available for Sale [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss) at beginning period	(5,798)	(5,798)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCL	0	0
Other comprehensive income	0	0
Accumulated other comprehensive income at end of period	(5,798)	(5,798)
Unrealized Losses on Settled Derivatives [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss) at beginning period	0	(247)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCL	0	62
Other comprehensive income	0	62
Accumulated other comprehensive income at end of period	0	(185)
Unrealized Losses on Settled Derivatives [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense		(95)
Tax expense (benefit)		(33)
Reclassification, net of tax		$ (62)