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Securities (Securities Available for Sale with Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Available for Sale, Losses less than 12 months, Fair Value | $ 1,857,312 | $ 1,047,869
Available for Sale, Losses less than 12 months, Gross Unrealized Losses | 56,218 | 9,553
Available for Sale, Losses 12 months or longer, Fair Value | 3,738 | 150,819
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses | 69 | 3,908
Available for Sale, Total, Fair Value | 1,861,050 | 1,198,688
Available for Sale, Total, Gross Unrealized Losses | 56,287 | 13,461
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for Sale, Losses less than 12 months, Fair Value | 54,788 |
Available for Sale, Losses less than 12 months, Gross Unrealized Losses | 1,923 |
Available for Sale, Losses 12 months or longer, Fair Value |  | 82
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses |  | 1
Available for Sale, Total, Fair Value | 54,788 | 82
Available for Sale, Total, Gross Unrealized Losses | 1,923 | 1
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for Sale, Losses less than 12 months, Fair Value | 228,588 | 8,296
Available for Sale, Losses less than 12 months, Gross Unrealized Losses | 11,186 | 38
Available for Sale, Total, Fair Value | 228,588 | 8,296
Available for Sale, Total, Gross Unrealized Losses | 11,186 | 38
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for Sale, Losses less than 12 months, Fair Value | 1,087,644 | 831,156
Available for Sale, Losses less than 12 months, Gross Unrealized Losses | 19,359 | 8,257
Available for Sale, Losses 12 months or longer, Fair Value | 3,738 | 116,126
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses | 69 | 2,925
Available for Sale, Total, Fair Value | 1,091,382 | 947,282
Available for Sale, Total, Gross Unrealized Losses | 19,428 | 11,182
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for Sale, Losses less than 12 months, Fair Value | 402,591 |
Available for Sale, Losses less than 12 months, Gross Unrealized Losses | 23,159 |
Available for Sale, Total, Fair Value | 402,591 |
Available for Sale, Total, Gross Unrealized Losses | 23,159 |
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for Sale, Losses less than 12 months, Fair Value | 83,701 | 208,397
Available for Sale, Losses less than 12 months, Gross Unrealized Losses | 591 | 1,257
Available for Sale, Losses 12 months or longer, Fair Value |  | 33,138
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses |  | 935
Available for Sale, Total, Fair Value | 83,701 | 241,535
Available for Sale, Total, Gross Unrealized Losses | $ 591 | 2,192
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for Sale, Losses less than 12 months, Fair Value |  | 20
Available for Sale, Losses less than 12 months, Gross Unrealized Losses |  | 1
Available for Sale, Losses 12 months or longer, Fair Value |  | 1,473
Available for Sale, Losses 12 months or longer, Gross Unrealized Losses |  | 47
Available for Sale, Total, Fair Value |  | 1,493
Available for Sale, Total, Gross Unrealized Losses |  | $ 48

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