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Allowance For Loan Losses (Rollforward Of The Allowance For Loan Losses By Portfolio Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | $ 201,968 |  | $ 204,034 | $ 202,068 |  | $ 210,242 |  |
Charge-offs | (9,830) |  | (18,296) | (18,243) |  | (35,908) |  |
Recoveries | 7,119 |  | 10,069 | 16,432 |  | 18,473 |  |
Provision/(provision credit) for loan losses | (2,000) |  | 4,000 | (3,000) |  | 7,000 |  |
Ending Balance | 197,257 |  | 199,807 | 197,257 |  | 199,807 |  |
Allowance - individually evaluated for impairment | 42,985 |  | 52,151 | 42,985 |  | 52,151 |  |
Allowance - collectively evaluated for impairment | 153,742 |  | 146,829 | 153,742 |  | 146,829 |  |
Allowance - purchased credit impaired loans | 530 |  | 827 | 530 |  | 827 | $ 700 |
Individually evaluated for impairment | 265,330 |  | 319,322 | 265,330 |  | 319,322 |  |
Collectively evaluated for impairment | 19,697,240 |  | 18,248,021 | 19,697,240 |  | 18,248,021 |  |
Purchase credit impaired loans - recorded investment | 26,749 |  | 21,994 | 26,749 |  | 21,994 |  |
Loans and Leases Receivable, Net of Deferred Income | 19,989,319 | [1] | 18,589,337 | 19,989,319 | [1] | 18,589,337 | 19,589,520 | [1]
Commercial Financial And Industrial Portfolio Segment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 93,107 |  | 80,887 | 89,398 |  | 73,637 |  |
Charge-offs | (1,865) |  | (7,869) | (2,465) |  | (14,394) |  |
Recoveries | 600 |  | 1,602 | 2,276 |  | 2,382 |  |
Provision/(provision credit) for loan losses | 537 |  | 6,352 | 3,170 |  | 19,347 |  |
Ending Balance | 92,379 |  | 80,972 | 92,379 |  | 80,972 |  |
Allowance - individually evaluated for impairment | 3,641 |  | 4,076 | 3,641 |  | 4,076 |  |
Allowance - collectively evaluated for impairment | 88,609 |  | 76,786 | 88,609 |  | 76,786 |  |
Allowance - purchased credit impaired loans | 129 |  | 110 | 129 |  | 110 |  |
Individually evaluated for impairment | 38,034 |  | 51,447 | 38,034 |  | 51,447 |  |
Collectively evaluated for impairment | 12,538,913 |  | 11,117,452 | 12,538,913 |  | 11,117,452 |  |
Purchase credit impaired loans - recorded investment | 21,272 |  | 10,546 | 21,272 |  | 10,546 |  |
Loans and Leases Receivable, Net of Deferred Income | 12,598,219 |  | 11,179,445 | 12,598,219 |  | 11,179,445 | 12,148,087 |
Commercial Real Estate Portfolio Segment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 30,888 |  | 25,626 | 33,852 |  | 25,159 |  |
Charge-offs | (20) |  | (51) | (20) |  | (693) |  |
Recoveries | 140 |  | 909 | 361 |  | 1,131 |  |
Provision/(provision credit) for loan losses | (538) |  | 3,780 | (3,723) |  | 4,667 |  |
Ending Balance | 30,470 |  | 30,264 | 30,470 |  | 30,264 |  |
Allowance - individually evaluated for impairment | 176 |  | 434 | 176 |  | 434 |  |
Allowance - collectively evaluated for impairment | 30,277 |  | 29,449 | 30,277 |  | 29,449 |  |
Allowance - purchased credit impaired loans | 17 |  | 381 | 17 |  | 381 |  |
Individually evaluated for impairment | 3,024 |  | 8,298 | 3,024 |  | 8,298 |  |
Collectively evaluated for impairment | 2,204,947 |  | 1,951,306 | 2,204,947 |  | 1,951,306 |  |
Purchase credit impaired loans - recorded investment | 4,025 |  | 9,808 | 4,025 |  | 9,808 |  |
Loans and Leases Receivable, Net of Deferred Income | 2,211,996 |  | 1,969,412 | 2,211,996 |  | 1,969,412 | 2,135,523 |
Consumer Real Estate Portfolio Segment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 49,680 |  | 67,321 | 50,357 |  | 80,614 |  |
Charge-offs | (3,951) |  | (6,582) | (7,800) |  | (13,508) |  |
Recoveries | 5,143 |  | 6,082 | 10,819 |  | 11,817 |  |
Provision/(provision credit) for loan losses | (4,803) |  | (7,740) | (7,307) |  | (19,842) |  |
Ending Balance | 46,069 |  | 59,081 | 46,069 |  | 59,081 |  |
Allowance - individually evaluated for impairment | 27,149 |  | 31,911 | 27,149 |  | 31,911 |  |
Allowance - collectively evaluated for impairment | 18,536 |  | 26,834 | 18,536 |  | 26,834 |  |
Allowance - purchased credit impaired loans | 384 |  | 336 | 384 |  | 336 |  |
Individually evaluated for impairment | 137,999 |  | 163,339 | 137,999 |  | 163,339 |  |
Collectively evaluated for impairment | 4,278,063 |  | 4,475,856 | 4,278,063 |  | 4,475,856 |  |
Purchase credit impaired loans - recorded investment | 1,397 |  | 1,584 | 1,397 |  | 1,584 |  |
Loans and Leases Receivable, Net of Deferred Income | 4,417,459 | [2] | 4,640,779 | 4,417,459 | [2] | 4,640,779 | 4,523,752 | [2]
Permanent Mortgage Portfolio Segment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 15,893 |  | 18,754 | 16,289 |  | 18,947 |  |
Charge-offs | (843) |  | (349) | (1,326) |  | (461) |  |
Recoveries | 488 |  | 484 | 1,391 |  | 1,263 |  |
Provision/(provision credit) for loan losses | 860 |  | (1,289) | 44 |  | (2,149) |  |
Ending Balance | 16,398 |  | 17,600 | 16,398 |  | 17,600 |  |
Allowance - individually evaluated for impairment | 11,858 |  | 15,583 | 11,858 |  | 15,583 |  |
Allowance - collectively evaluated for impairment | 4,540 |  | 2,017 | 4,540 |  | 2,017 |  |
Allowance - purchased credit impaired loans | 0 |  | 0 | 0 |  | 0 |  |
Individually evaluated for impairment | 85,913 |  | 95,882 | 85,913 |  | 95,882 |  |
Collectively evaluated for impairment | 322,182 |  | 343,132 | 322,182 |  | 343,132 |  |
Purchase credit impaired loans - recorded investment | 0 |  | 0 | 0 |  | 0 |  |
Loans and Leases Receivable, Net of Deferred Income | 408,095 |  | 439,014 | 408,095 |  | 439,014 | 423,125 |
Credit Card And Other Portfolio Segment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | 12,400 |  | 11,446 | 12,172 |  | 11,885 |  |
Charge-offs | (3,151) |  | (3,445) | (6,632) |  | (6,852) |  |
Recoveries | 748 |  | 992 | 1,585 |  | 1,880 |  |
Provision/(provision credit) for loan losses | 1,944 |  | 2,897 | 4,816 |  | 4,977 |  |
Ending Balance | 11,941 |  | 11,890 | 11,941 |  | 11,890 |  |
Allowance - individually evaluated for impairment | 161 |  | 147 | 161 |  | 147 |  |
Allowance - collectively evaluated for impairment | 11,780 |  | 11,743 | 11,780 |  | 11,743 |  |
Allowance - purchased credit impaired loans | 0 |  | 0 | 0 |  | 0 |  |
Individually evaluated for impairment | 360 |  | 356 | 360 |  | 356 |  |
Collectively evaluated for impairment | 353,135 |  | 360,275 | 353,135 |  | 360,275 |  |
Purchase credit impaired loans - recorded investment | 55 |  | 56 | 55 |  | 56 |  |
Loans and Leases Receivable, Net of Deferred Income | $ 353,550 |  | $ 360,687 | $ 353,550 |  | $ 360,687 | $ 359,033 |
[1] | June 30, 2017 and December 31, 2016 include $28.8 million and $28.5 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate properties in process of foreclosure.
[2] | Balances as of June 30, 2017 and December 31, 2016, include $28.8 million and $35.9 million of restricted real estate loans, respectively. See Note 13—Variable Interest Entities for additional information.

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- Definition The recorded balance for loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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