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Loans and Allowance for Loan Losses - Changes in the carrying value of acquired credit impaired loans - (Details 4)
3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans          
Decline in accretable yield balance   $ 64,100,000      
Percentage of loss adjustment based on most current collateral value 90        
Maximum          
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans          
Threshold limit of loans for risk assessment by loan officers $ 500,000   $ 500,000    
Minimum          
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans          
Threshold limit of loans for risk assessment by loan officers 100,000   100,000    
Acquired credit impaired loans          
Changes in the carrying value of acquired loans at the acquisition date          
Balance at the beginning of the period   919,402,000 919,402,000 $ 1,220,638,000 $ 969,395,000
Net reductions for payments, foreclosures, and accretion     (189,191,000) (299,329,000) (344,348,000)
Change in the allowance for loan losses on acquired loans     3,659,000 (1,907,000) (918,000)
Balance at the end of the period 733,870,000   733,870,000 919,402,000 1,220,638,000
Fair value of acquired loans         596,509,000
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans          
Balance at beginning of period   $ 306,826,000 306,826,000 301,516,000 160,849,000
Accretion     (97,847,000) (105,254,000) (104,705,000)
Reclass of nonaccretable difference due to improvement in expected cash flows     61,985,000 112,316,000 71,136,000
Other changes, net     (69,426,000) (1,752,000) (7,720,000)
Balance at end of period $ 201,538,000   $ 201,538,000 $ 306,826,000 301,516,000
Acquired credit impaired loans | First Financial Holdings, Inc. ("First Financial")          
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans          
Addition from acquisition         $ 181,956,000