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Selected Quarterly Information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Jun. 30, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Selected Quarterly Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net interest income | $ 18,634 us-gaap_InterestIncomeExpenseNet | $ 19,942 us-gaap_InterestIncomeExpenseNet | $ 20,007 us-gaap_InterestIncomeExpenseNet | $ 20,186 us-gaap_InterestIncomeExpenseNet | $ 22,948 us-gaap_InterestIncomeExpenseNet | $ 22,444 us-gaap_InterestIncomeExpenseNet | $ 22,526 us-gaap_InterestIncomeExpenseNet | $ 21,146 us-gaap_InterestIncomeExpenseNet | $ 79,729 us-gaap_InterestIncomeExpenseNet | $ 88,104 us-gaap_InterestIncomeExpenseNet | $ 78,401 us-gaap_InterestIncomeExpenseNet
Net income (loss) to common shareholders | 1,379 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 28,572 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (3,028)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 19,266 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (6,921)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 29,442 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 18,381 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (8,293)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 18,630 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 60,167 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 72,006 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Comprehensive Income (Loss), Net of Tax, Attributable to Parent | $ 6,234 us-gaap_ComprehensiveIncomeNetOfTax | $ 14,090 us-gaap_ComprehensiveIncomeNetOfTax | $ 26,532 us-gaap_ComprehensiveIncomeNetOfTax | $ 19,813 us-gaap_ComprehensiveIncomeNetOfTax | $ (6,184)us-gaap_ComprehensiveIncomeNetOfTax | $ (67,215)us-gaap_ComprehensiveIncomeNetOfTax | $ 27,427 us-gaap_ComprehensiveIncomeNetOfTax | $ 26,906 us-gaap_ComprehensiveIncomeNetOfTax | $ 73,762 us-gaap_ComprehensiveIncomeNetOfTax | $ (26,160)us-gaap_ComprehensiveIncomeNetOfTax | $ 127,772 us-gaap_ComprehensiveIncomeNetOfTax
Net income (loss) per common share - basic and diluted | $ 0.03 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.52 us-gaap_EarningsPerShareBasicAndDiluted | $ (0.06)us-gaap_EarningsPerShareBasicAndDiluted | $ 0.35 us-gaap_EarningsPerShareBasicAndDiluted | $ (0.13)us-gaap_EarningsPerShareBasicAndDiluted | $ 0.54 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.34 us-gaap_EarningsPerShareBasicAndDiluted | $ (0.15)us-gaap_EarningsPerShareBasicAndDiluted | $ 0.34 us-gaap_EarningsPerShareBasicAndDiluted | $ 1.10 us-gaap_EarningsPerShareBasicAndDiluted | $ 1.35 us-gaap_EarningsPerShareBasicAndDiluted
Dividends declared per common share | $ 0.25 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.25 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.25 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.27 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.27 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.29 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.29 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.25 us-gaap_CommonStockDividendsPerShareDeclared |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=35737396 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References No definition available. + Details
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- Definition The net amount of operating interest income (expense). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.10) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 10 -Article 9 + Details
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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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