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Securities (Amortized Cost and Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | $ 2,562,000 | $ 2,086,745
Securities Available for Sale, Gross Unrealized Gains | 11,195 | 20,120
Securities Available for Sale, Gross Unrealized Losses | 56,287 | 13,461
Securities Available for Sale, Fair Value | 2,516,908 | 2,093,404
U.S. Treasury And Government Agency Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 56,751 | 135
Securities Available for Sale, Gross Unrealized Losses | 1,923 | 1
Securities Available for Sale, Fair Value | 54,828 | 134
Municipal Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 253,228 | 39,410
Securities Available for Sale, Gross Unrealized Gains | 113 | 235
Securities Available for Sale, Gross Unrealized Losses | 11,186 | 38
Securities Available for Sale, Fair Value | 242,155 | 39,607
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 1,620,191 | 1,750,168
Securities Available for Sale, Gross Unrealized Gains | 10,592 | 19,387
Securities Available for Sale, Gross Unrealized Losses | 19,428 | 11,182
Securities Available for Sale, Fair Value | 1,611,355 | 1,758,373
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 425,750 |
Securities Available for Sale, Gross Unrealized Losses | 23,159 |
Securities Available for Sale, Fair Value | 402,591 |
Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 202,580 | 291,085
Securities Available for Sale, Gross Unrealized Gains | 490 | 140
Securities Available for Sale, Gross Unrealized Losses | 591 | 2,192
Securities Available for Sale, Fair Value | 202,479 | 289,033
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost | 3,500 | 3,500
Securities Available for Sale, Fair Value | $ 3,500 | 3,500
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities Available for Sale, Amortized Cost |  | 2,447
Securities Available for Sale, Gross Unrealized Gains |  | 358
Securities Available for Sale, Gross Unrealized Losses |  | 48
Securities Available for Sale, Fair Value |  | $ 2,757

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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