Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss) at beginning period	$ (8,058)	$ (11,921)
Other comprehensive income (loss) before reclassifications	1,004	(959)
Amounts reclassified from AOCL	101	(185)
Net current-period other comprehensive income (loss)	1,105	(1,144)
Accumulated other comprehensive income at end of period	(6,953)	(13,065)
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net impairment loss recognized in earnings	0	177
Interest expense	2,394	3,596
Income (loss) before income tax	5,842	3,504
Tax expense	35	0
Net Income (loss)	5,807	3,504
Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net Income (loss)	(101)	185
Unrealized Losses on Available For Sale Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss) at beginning period	(516)	(3,579)
Other comprehensive income (loss) before reclassifications	1,007	(908)
Amounts reclassified from AOCL	7	(515)
Net current-period other comprehensive income (loss)	1,014	(1,423)
Accumulated other comprehensive income at end of period	498	(5,002)
Unrealized 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	(7)	692
Net impairment loss recognized in earnings	0	(177)
Income (loss) before income tax	(7)	515
Tax expense	0	0
Net Income (loss)	(7)	515
Disproportionate Tax Effects from Securities Available for Sale [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss) at beginning period	(5,617)	(5,617)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCL	0	0
Net current-period other comprehensive income (loss)	0	0
Accumulated other comprehensive income at end of period	(5,617)	(5,617)
Unrealized Losses on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss) at beginning period	(739)	(1,103)
Other comprehensive income (loss) before reclassifications	(3)	(51)
Amounts reclassified from AOCL	94	185
Net current-period other comprehensive income (loss)	91	134
Accumulated other comprehensive income at end of period	(648)	(969)
Unrealized Losses on Cash Flow Hedges [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense	(94)	(185)
Tax expense	0	0
Net Income (loss)	(94)	(185)
Unrealized Losses on Settled Derivatives [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss) at beginning period	0	(436)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCL	0	145
Net current-period other comprehensive income (loss)	0	145
Accumulated other comprehensive income at end of period	0	(291)
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		(145)
Tax expense		0
Net Income (loss)		(145)
Disproportionate Tax Effects from Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss) at beginning period	(1,186)	(1,186)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCL	0	0
Net current-period other comprehensive income (loss)	0	0
Accumulated other comprehensive income at end of period	$ (1,186)	$ (1,186)