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Subsequent Event	6 Months Ended
Subsequent Event	Jun. 30, 2015
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event In June 2015, the Corporation issued $150 million of ten-year subordinated notes, which mature on November 15, 2024 and carry a fixed rate of 4.50% and an effective rate of approximately 4.70% as a result of issuance costs. Interest is paid semi-annually in May and November. The proceeds from the issuance of the subordinated notes were used to redeem $150 million of trust preferred securities in July 2015. The redeemed securities carried a fixed interest rate of 6.29% and an effective rate of 6.52%, and had a scheduled maturity of February 1, 2036. As a result of this transaction, the Corporation recorded a $5.6 million loss on redemption, included as a component of non-interest expense, in July 2015.