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Loans (Balances Of Commercial Loan Portfolio Classes, Disaggregated By PD Grade) (Details) $ in Thousands | Mar. 31, 2017 USD ($) number | Dec. 31, 2016 USD ($) number | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses |  | $ 201,968 | $ 202,068 | $ 204,034 | $ 210,242
Total loans collectively evaluated for impairment |  | 18,762,625 |  | 17,231,978 |
Total loans individually evaluated for impairment |  | 283,550 |  | 312,762 |
Allowance - collectively evaluated for impairment |  | 157,056 |  | 145,010 |
Allowance - individually evaluated for impairment |  | 44,322 |  | 57,876 |
Allowance - purchased credit impaired loans |  | 590 | $ 700 | 1,148 |
Purchase credit impaired loans - recorded investment |  | $ 43,899 |  | $ 30,254 |
Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percent of total commercial loans |  | 100.00% | 100.00% |  |
Allowance for loan losses |  | $ 123,995 | $ 123,250 |  |
Total loans collectively evaluated for impairment |  | 13,786,817 | 14,187,074 |  |
Total loans individually evaluated for impairment |  | 48,066 | 51,086 |  |
Total commercial loans |  | 13,877,307 | 14,283,610 |  |
Allowance - collectively evaluated for impairment |  | 119,788 | 118,518 |  |
Allowance - individually evaluated for impairment |  | 3,967 | 4,413 |  |
Allowance - purchased credit impaired loans |  | $ 240 | $ 319 |  |
Percent of loan collectively evaluated for impairment |  | 99.00% | 99.00% |  |
Percent of loan individually evaluated for impairment |  | 1.00% | 1.00% |  |
Purchase credit impaired loans - recorded investment |  | $ 42,424 | $ 45,450 |  |
Percent of loan purchased-credit impaired |  | 0.00% | 0.00% |  |
General C I [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total loans collectively evaluated for impairment |  | $ 9,787,530 | $ 9,710,168 |  |
Total loans individually evaluated for impairment |  | 41,787 | 44,753 |  |
Total commercial loans |  | 9,867,595 | 9,795,453 |  |
Purchase credit impaired loans - recorded investment |  | 38,278 | 40,532 |  |
Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total loans collectively evaluated for impairment |  | 1,528,982 | 2,045,189 |  |
Total loans individually evaluated for impairment |  | 0 | 0 |  |
Total commercial loans |  | 1,528,982 | 2,045,189 |  |
Purchase credit impaired loans - recorded investment |  | 0 | 0 |  |
TRUPs [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total loans collectively evaluated for impairment | [1] | 304,236 | 304,236 |  |
Total loans individually evaluated for impairment | [1] | 3,183 | 3,209 |  |
Total commercial loans | [1] | 307,419 | 307,445 |  |
Valuation allowance |  | $ 25,500 | $ 25,500 |  |
Highest internal grade | number |  | 13 | 13 |  |
Purchase credit impaired loans - recorded investment | [1] | $ 0 | $ 0 |  |
Income C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total loans collectively evaluated for impairment |  | 2,128,036 | 2,085,619 |  |
Total loans individually evaluated for impairment |  | 1,803 | 1,831 |  |
Total commercial loans |  | 2,133,891 | 2,092,033 |  |
Purchase credit impaired loans - recorded investment |  | 4,052 | 4,583 |  |
Residential C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total loans collectively evaluated for impairment |  | 38,033 | 41,862 |  |
Total loans individually evaluated for impairment |  | 1,293 | 1,293 |  |
Total commercial loans |  | 39,420 | 43,490 |  |
Purchase credit impaired loans - recorded investment |  | 94 | 335 |  |
Commercial Loan P D Grade One [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | $ 478,635 | $ 466,257 |  |
Percent of total commercial loans |  | 3.00% | 3.00% |  |
Allowance for loan losses |  | $ 78 | $ 77 |  |
Commercial Loan P D Grade One [Member] | General C I [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 478,025 | 465,179 |  |
Commercial Loan P D Grade One [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 0 | 0 |  |
Commercial Loan P D Grade One [Member] | TRUPs [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade | [1] | 0 | 0 |  |
Commercial Loan P D Grade One [Member] | Income C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 610 | 1,078 |  |
Commercial Loan P D Grade One [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 0 | 0 |  |
Commercial Loan P D Grade Two [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | $ 902,824 | $ 803,012 |  |
Percent of total commercial loans |  | 7.00% | 6.00% |  |
Allowance for loan losses |  | $ 442 | $ 403 |  |
Commercial Loan P D Grade Two [Member] | General C I [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 891,450 | 791,183 |  |
Commercial Loan P D Grade Two [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 0 | 0 |  |
Commercial Loan P D Grade Two [Member] | TRUPs [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade | [1] | 0 | 0 |  |
Commercial Loan P D Grade Two [Member] | Income C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 11,293 | 11,742 |  |
Commercial Loan P D Grade Two [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 81 | 87 |  |
Commercial Loan P D Grade Three [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | $ 962,378 | $ 1,107,542 |  |
Percent of total commercial loans |  | 7.00% | 8.00% |  |
Allowance for loan losses |  | $ 239 | $ 304 |  |
Commercial Loan P D Grade Three [Member] | General C I [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 403,403 | 491,386 |  |
Commercial Loan P D Grade Three [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 398,860 | 462,486 |  |
Commercial Loan P D Grade Three [Member] | TRUPs [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade | [1] | 0 | 0 |  |
Commercial Loan P D Grade Three [Member] | Income C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 160,115 | 153,670 |  |
Commercial Loan P D Grade Three [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 0 | 0 |  |
Commercial Loan P D Grade Four [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | $ 1,467,562 | $ 1,532,811 |  |
Percent of total commercial loans |  | 11.00% | 11.00% |  |
Allowance for loan losses |  | $ 879 | $ 953 |  |
Commercial Loan P D Grade Four [Member] | General C I [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 998,015 | 978,282 |  |
Commercial Loan P D Grade Four [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 227,257 | 332,107 |  |
Commercial Loan P D Grade Four [Member] | TRUPs [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade | [1] | 0 | 0 |  |
Commercial Loan P D Grade Four [Member] | Income C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 242,069 | 222,422 |  |
Commercial Loan P D Grade Four [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 221 | 0 |  |
Commercial Loan P D Grade Five [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | $ 1,835,298 | $ 1,873,965 |  |
Percent of total commercial loans |  | 13.00% | 13.00% |  |
Allowance for loan losses |  | $ 7,260 | $ 6,670 |  |
Commercial Loan P D Grade Five [Member] | General C I [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 1,269,384 | 1,232,401 |  |
Commercial Loan P D Grade Five [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 139,434 | 275,209 |  |
Commercial Loan P D Grade Five [Member] | TRUPs [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade | [1] | 0 | 0 |  |
Commercial Loan P D Grade Five [Member] | Income C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 426,147 | 365,653 |  |
Commercial Loan P D Grade Five [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 333 | 702 |  |
Commercial Loan P D Grade Six [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | $ 2,432,971 | $ 2,502,310 |  |
Percent of total commercial loans |  | 17.00% | 17.00% |  |
Allowance for loan losses |  | $ 10,600 | $ 10,403 |  |
Commercial Loan P D Grade Six [Member] | General C I [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 1,535,573 | 1,540,519 |  |
Commercial Loan P D Grade Six [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 521,253 | 614,109 |  |
Commercial Loan P D Grade Six [Member] | TRUPs [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade | [1] | 0 | 0 |  |
Commercial Loan P D Grade Six [Member] | Income C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 368,073 | 338,344 |  |
Commercial Loan P D Grade Six [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 8,072 | 9,338 |  |
Commercial Loan P D Grade Seven [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | $ 2,047,501 | $ 2,228,369 |  |
Percent of total commercial loans |  | 15.00% | 16.00% |  |
Allowance for loan losses |  | $ 12,767 | $ 14,010 |  |
Commercial Loan P D Grade Seven [Member] | General C I [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 1,479,242 | 1,556,117 |  |
Commercial Loan P D Grade Seven [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 169,444 | 317,283 |  |
Commercial Loan P D Grade Seven [Member] | TRUPs [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade | [1] | 0 | 0 |  |
Commercial Loan P D Grade Seven [Member] | Income C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 396,654 | 352,390 |  |
Commercial Loan P D Grade Seven [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 2,161 | 2,579 |  |
Commercial Loan P D Grade Eight [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | $ 1,449,113 | $ 1,422,786 |  |
Percent of total commercial loans |  | 10.00% | 10.00% |  |
Allowance for loan losses |  | $ 24,532 | $ 25,986 |  |
Commercial Loan P D Grade Eight [Member] | General C I [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 1,042,772 | 963,359 |  |
Commercial Loan P D Grade Eight [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 49,588 | 30,974 |  |
Commercial Loan P D Grade Eight [Member] | TRUPs [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade | [1] | 0 | 0 |  |
Commercial Loan P D Grade Eight [Member] | Income C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 352,370 | 425,503 |  |
Commercial Loan P D Grade Eight [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 4,383 | 2,950 |  |
Commercial Loan P D Grade Nine [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | $ 732,197 | $ 725,767 |  |
Percent of total commercial loans |  | 5.00% | 5.00% |  |
Allowance for loan losses |  | $ 14,396 | $ 13,857 |  |
Commercial Loan P D Grade Nine [Member] | General C I [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 641,463 | 611,774 |  |
Commercial Loan P D Grade Nine [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 4,643 | 4,299 |  |
Commercial Loan P D Grade Nine [Member] | TRUPs [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade | [1] | 0 | 0 |  |
Commercial Loan P D Grade Nine [Member] | Income C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 82,734 | 105,277 |  |
Commercial Loan P D Grade Nine [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 3,357 | 4,417 |  |
Commercial Loan P D Grade Ten [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | $ 394,316 | $ 423,616 |  |
Percent of total commercial loans |  | 3.00% | 3.00% |  |
Allowance for loan losses |  | $ 8,510 | $ 8,400 |  |
Commercial Loan P D Grade Ten [Member] | General C I [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 344,633 | 355,359 |  |
Commercial Loan P D Grade Ten [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 4,499 | 8,663 |  |
Commercial Loan P D Grade Ten [Member] | TRUPs [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade | [1] | 0 | 0 |  |
Commercial Loan P D Grade Ten [Member] | Income C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 35,489 | 50,484 |  |
Commercial Loan P D Grade Ten [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 9,695 | 9,110 |  |
Commercial Loan P D Grade Eleven [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | $ 251,213 | $ 265,371 |  |
Percent of total commercial loans |  | 2.00% | 2.00% |  |
Allowance for loan losses |  | $ 6,289 | $ 6,556 |  |
Commercial Loan P D Grade Eleven [Member] | General C I [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 228,258 | 238,230 |  |
Commercial Loan P D Grade Eleven [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 0 | 0 |  |
Commercial Loan P D Grade Eleven [Member] | TRUPs [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade | [1] | 0 | 0 |  |
Commercial Loan P D Grade Eleven [Member] | Income C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 17,501 | 20,600 |  |
Commercial Loan P D Grade Eleven [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 5,454 | 6,541 |  |
Commercial Loan P D Grade Twelve [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | $ 194,990 | $ 190,094 |  |
Percent of total commercial loans |  | 1.00% | 1.00% |  |
Allowance for loan losses |  | $ 6,862 | $ 6,377 |  |
Commercial Loan P D Grade Twelve [Member] | General C I [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 162,238 | 170,531 |  |
Commercial Loan P D Grade Twelve [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 13,956 | 0 |  |
Commercial Loan P D Grade Twelve [Member] | TRUPs [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade | [1] | 0 | 0 |  |
Commercial Loan P D Grade Twelve [Member] | Income C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 15,831 | 15,395 |  |
Commercial Loan P D Grade Twelve [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 2,965 | 4,168 |  |
Commercial Loan P D Grade Thirteen [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | $ 424,963 | $ 432,571 |  |
Percent of total commercial loans |  | 3.00% | 3.00% |  |
Allowance for loan losses |  | $ 3,757 | $ 4,225 |  |
Commercial Loan P D Grade Thirteen [Member] | General C I [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 115,844 | 121,276 |  |
Commercial Loan P D Grade Thirteen [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 0 | 0 |  |
Commercial Loan P D Grade Thirteen [Member] | TRUPs [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade | [1] | 304,236 | 304,236 |  |
Commercial Loan P D Grade Thirteen [Member] | Income C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 4,755 | 6,748 |  |
Commercial Loan P D Grade Thirteen [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 128 | 311 |  |
Commercial Loan P D Grade Fourteen Fifteen Sixteen [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | $ 212,856 | $ 212,603 |  |
Percent of total commercial loans |  | 2.00% | 1.00% |  |
Allowance for loan losses |  | $ 23,177 | $ 20,297 |  |
Commercial Loan P D Grade Fourteen Fifteen Sixteen [Member] | General C I [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 197,230 | 194,572 |  |
Commercial Loan P D Grade Fourteen Fifteen Sixteen [Member] | Loans To Mortgage Companies [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 48 | 59 |  |
Commercial Loan P D Grade Fourteen Fifteen Sixteen [Member] | TRUPs [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade | [1] | 0 | 0 |  |
Commercial Loan P D Grade Fourteen Fifteen Sixteen [Member] | Income C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | 14,395 | 16,313 |  |
Commercial Loan P D Grade Fourteen Fifteen Sixteen [Member] | Residential C R E [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Commercial loan, Disaggregated by PD grade |  | $ 1,183 | $ 1,659 |  |
[1] | Balances as of March 31 , 2017 and December 31, 2016 , presented net of a $ 25.5 million valuation allowance . Based on the underlying structure of the notes , the highest possible internal grade is " 13 ".

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