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Cash and Due from Banks (Details) (USD $)
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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|---|---|---|---|
| Cash and Due from Banks [Abstract] | |||
| Cash and due from banks | $ 522,358,000 | $ 634,432,000 | $ 309,240,000 |
| Non-interest bearing deposits with other banks | 63,000,000 | 36,700,000 | |
| Interest bearing balances with the Federal Reserve | 426,300,000 | 560,500,000 | |
| Interest bearing balances with the Federal Home Loan Bank | 5,000,000 | 3,600,000 | |
| Minimum required bank deposits with other or federal reserve bank | $ 66,100,000 | $ 152,300,000 |