|
Securities (Additional Information) (Details) (USD $)
|
12 Months Ended |
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Dec. 31, 2014
security
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Dec. 31, 2013
security
|
Dec. 31, 2012
security
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| Schedule of Investments [Line Items] |
|
|
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| Unrealized gains on securities available-for-sale included in accumulated other comprehensive income, net of deferred taxes |
$ (319,000) |
$ (7,964,000) |
|
| Unrealized gains on securities available-for-sale included in accumulated other comprehensive income, deferred taxes |
172,000 |
4,288,000 |
|
| Number of investment securities which had unrealized losses for twelve months or longer |
74 |
93 |
|
| AFS and HTM securities in Continues Unrealized Loss Position |
434,100,000 |
509,200,000 |
|
| AFS and HTM Securities Unrealized Loss Accumulated in Investments |
7,900,000 |
19,800,000 |
|
| Investment securities with unrealized losses for twelve months or longer |
307,951,000 |
122,236,000 |
|
| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
7,313,000 |
7,834,000 |
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| Investment securities with unrealized losses that are considered temporary |
428,315,000 |
509,203,000 |
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| Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated In Investments |
(7,924,000) |
(19,776,000) |
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| Other than temporary impairment losses |
0 |
0 |
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| Carrying value of investments sold |
25,200,000 |
16,800,000 |
113,000,000 |
| Security pledged as collateral, amortized cost |
486,200,000 |
479,200,000 |
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| Security pledged as collateral, fair value |
485,600,000 |
474,700,000 |
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| Mortgage Backed Securities and Collateralized Mortgage Obligations [Member] |
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|
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| Schedule of Investments [Line Items] |
|
|
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| Investment securities with unrealized losses for twelve months or longer |
308,000,000 |
117,300,000 |
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| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
7,300,000 |
7,400,000 |
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| Private issue collateralized mortgage obligations [Member] |
|
|
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| Schedule of Investments [Line Items] |
|
|
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| Investment securities with unrealized losses for twelve months or longer |
0 |
4,945,000 |
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| Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
0 |
403,000 |
|
| Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year |
0 |
|
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| Investment securities with unrealized losses that are considered temporary |
1,785,000 |
5,067,000 |
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| Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated In Investments |
(8,000) |
(407,000) |
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| Other Than Temporary Impairment, Number of Securities |
|
|
1 |
| Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold |
|
|
$ 176,000 |