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Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Impaired Loans by Loan Class) (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment [1] $ 51,113 $ 68,471 $ 69,487
Impaired Financing Receivable, Related Allowance 8,483 6,577 6,270
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 61,914 61,066 57,925
Impaired Financing Receivable, Recorded Investment [2] 113,027 129,537 127,412
Impaired Financing Receivable, Unpaid Principal Balance 132,788 152,473 153,742
Impaired Financing Receivable, Average Recorded Investment 116,642 134,792 134,967
Impaired Financing Receivable, Interest Income Recognized 4,731 5,325 7,190
Commercial | Commercial and industrial      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 8,580 8,384 9,989
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 9,118 11,333 10,785
Impaired Financing Receivable, Related Allowance 1,865 2,273 1,915
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 8,906 9,367 10,784
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 381 537 539
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 9,142 7,563 5,797
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 11,997 8,285 8,862
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 9,716 7,909 6,664
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 539 306 595
Commercial | Franchise      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 0 0 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 0 0 0
Commercial | Mortgage warehouse lines of credit      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 0 0 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 0 0 0
Commercial | Community Advanatage - homeowners association      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 0 0 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 0 0 0
Commercial | Aircraft      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 0 0 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 0 0 0
Commercial | Asset-based lending      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 0 0 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 12 25 25
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 1,573 1,952 1,952
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 4 108 87
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 66 75 100
Commercial | Tax exempt      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 0 0 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 0 0 0
Commercial | Leases      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 0 0 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 0 0 0
Commercial | Other      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 0 0 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 0 0 0
Commercial real estate | Residential construction      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 0 0 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 2,023 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 2,023 0 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 2,023 0 0
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 73 0 0
Commercial real estate | Commercial construction      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 425 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 440 0
Impaired Financing Receivable, Related Allowance 0 195 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 432 0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 0 15 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 31 2,803 2,875
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 32 2,803 3,085
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 11 2,777 3,183
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 0 98 151
Commercial real estate | Land      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 3,559 7,502 5,011
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 7,309 7,502 8,626
Impaired Financing Receivable, Related Allowance 31 40 43
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 3,713 7,572 5,933
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 362 193 544
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 4,114 8,101 10,210
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 4,874 12,432 10,941
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 4,232 8,969 10,268
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 130 538 430
Commercial real estate | Office      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 6,765 8,198 11,038
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 7,724 9,671 12,863
Impaired Financing Receivable, Related Allowance 2,162 322 305
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 7,113 8,493 11,567
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 263 300 576
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 4,171 5,159 4,132
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 5,120 6,359 5,020
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 4,243 6,679 4,445
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 194 244 216
Commercial real estate | Industrial      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 10,049 2,567 195
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 10,542 2,672 277
Impaired Financing Receivable, Related Allowance 1,550 151 15
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 10,662 2,595 214
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 421 92 13
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 2,255 1,903 4,160
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 2,448 2,110 4,498
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 2,304 1,962 3,807
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 141 76 286
Commercial real estate | Retail      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 8,899 10,861 11,045
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 9,596 11,279 14,566
Impaired Financing Receivable, Related Allowance 381 921 487
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 8,906 10,826 12,116
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 306 362 606
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 3,140 8,095 5,487
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 3,302 10,177 7,470
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 3,305 8,647 6,915
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 104 342 330
Commercial real estate | Multi-family      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 1,199 2,822 2,808
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 1,622 3,335 3,321
Impaired Financing Receivable, Related Allowance 203 107 158
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 1,210 2,847 2,839
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 60 109 145
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 1,330 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 1,635 0 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 1,522 0 0
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 50 0 0
Commercial real estate | Mixed use and other      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 7,162 21,172 21,777
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 7,345 21,453 24,076
Impaired Financing Receivable, Related Allowance 1,501 1,738 2,240
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 7,250 20,891 21,483
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 224 656 1,017
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 13,788 9,042 7,985
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 16,576 11,772 8,804
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 14,668 9,467 9,533
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 563 445 449
Home equity      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 547 1,438 1,946
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 762 1,533 2,055
Impaired Financing Receivable, Related Allowance 239 292 475
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 672 1,491 1,995
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 25 42 80
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 7,818 4,484 4,453
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 8,406 6,490 6,172
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 7,065 4,806 4,666
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 229 207 256
Residential real estate      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 4,225 4,889 5,467
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 4,326 4,986 5,600
Impaired Financing Receivable, Related Allowance 521 485 606
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 4,280 4,783 5,399
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 130 157 241
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 13,788 13,234 12,640
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 15,932 14,953 14,334
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 14,387 13,291 12,682
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 449 496 595
Premium finance receivables | Commercial insurance loans      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 0 0 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 0 0 0
Premium finance receivables | Life insurance loans      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 0 0 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 0 0 0
Premium finance receivables | PCI - life insurance loans      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, Related Allowance 0 0 0
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 0 0 0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 0 0 0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 0 0 0
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized 0 0 0
Consumer and other      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, with Related Allowance, Recorded Investment 128 213 211
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance 128 215 213
Impaired Financing Receivable, Related Allowance 30 53 26
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment 139 215 214
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized 6 6 10
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 302 657 161
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 398 721 222
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment 311 665 173
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized $ 15 $ 29 $ 11
[1] These impaired loans require an allowance for loan losses because the estimated fair value of the loans or related collateral is less than the recorded investment in the loans.
[2] Impaired loans are considered by the Company to be non-accrual loans, TDRs or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest.