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Shareholders' Equity - Components of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Opening balance $ (42,484) $ (43,731) $ 3,395
Other comprehensive income (loss) before reclassification (3,426) 1,433 (46,827)
Amounts reclassified from accumulated other comprehensive loss 516 (186) (299)
Other comprehensive (loss) income, net of tax (2,910) 1,247 (47,126)
Ending balance (45,394) (42,484) (43,731)
Securities Available for Sale and Transferred Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Opening balance (11,003) (25,462) 44,935
Other comprehensive income (loss) before reclassification (6,391) 14,644 (70,098)
Amounts reclassified from accumulated other comprehensive loss   (185) (299)
Other comprehensive (loss) income, net of tax (6,391) 14,459 (70,397)
Ending balance (17,394) (11,003) (25,462)
Defined Benefit Pension Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Opening balance (31,617) (19,793) (41,540)
Other comprehensive income (loss) before reclassification 3,777 (11,824) 21,747
Other comprehensive (loss) income, net of tax 3,777 (11,824) 21,747
Ending balance (27,840) (31,617) (19,793)
Cash Flow Hedge Derivatives [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Opening balance 136 1,524  
Other comprehensive income (loss) before reclassification (812) (1,387) 1,524
Amounts reclassified from accumulated other comprehensive loss 516 (1)  
Other comprehensive (loss) income, net of tax (296) (1,388) 1,524
Ending balance $ (160) $ 136 $ 1,524