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Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary Of Activity In The Allowance For Credit Losses By Loan Portfolio) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Allowance for loan losses at beginning of period $ 106,842 $ 111,920 $ 107,351 $ 110,381
Other adjustments (205) (534) (743) (1,044)
Reclassification from (to) allowance for unfunded lending-related commitments 284 626 136 953
Charge-offs (12,815) (23,937) (45,752) (57,627)
Recoveries 1,502 6,020 4,116 7,884
Provision for credit losses 11,580 18,192 42,080 51,740
Allowance for loan losses at period end 107,188 112,287 107,188 112,287
Allowance for unfunded lending-related commitments at period end 1,267 12,627 1,267 12,627
Allowance for credit losses at period end 108,455 124,914 108,455 124,914
Allowance for credit losses at period end, Individually evaluated for impairment 14,975 31,902 14,975 31,902
Allowance for credit losses at period end, Collectively evaluated for impairment 93,259 93,009 93,259 93,009
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality 221 3 221 3
Loans at period end, Individually evaluated for impairment 178,761 233,014 178,761 233,014
Loans at period end, Collectively evaluated for impairment 11,872,979 10,664,331 11,872,979 10,664,331
Loans at period end, Loans acquired with deteriorated credit quality 529,299 592,555 529,299 592,555
Commercial
        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Allowance for loan losses at beginning of period 28,737 26,983 28,794 31,237
Other adjustments (15) (138) (19) (142)
Reclassification from (to) allowance for unfunded lending-related commitments 0 0 0 45
Charge-offs (3,281) (3,315) (8,914) (12,623)
Recoveries 756 349 1,319 852
Provision for credit losses 2,044 3,862 7,061 8,372
Allowance for loan losses at period end 28,241 27,741 28,241 27,741
Allowance for unfunded lending-related commitments at period end 0 0 0 0
Allowance for credit losses at period end 28,241 27,741 28,241 27,741
Allowance for credit losses at period end, Individually evaluated for impairment 5,498 3,168 5,498 3,168
Allowance for credit losses at period end, Collectively evaluated for impairment 22,636 24,573 22,636 24,573
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality 107 0 107 0
Loans at period end, Individually evaluated for impairment 24,688 38,838 24,688 38,838
Loans at period end, Collectively evaluated for impairment 3,075,094 2,726,255 3,075,094 2,726,255
Loans at period end, Loans acquired with deteriorated credit quality 9,339 5,960 9,339 5,960
Commercial real-estate
        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Allowance for loan losses at beginning of period 51,950 53,801 52,135 56,405
Other adjustments (193) (304) (621) (787)
Reclassification from (to) allowance for unfunded lending-related commitments 284 626 136 908
Charge-offs (6,982) (17,000) (25,228) (34,455)
Recoveries 272 5,352 1,224 5,657
Provision for credit losses 5,488 12,610 23,173 27,357
Allowance for loan losses at period end 50,819 55,085 50,819 55,085
Allowance for unfunded lending-related commitments at period end 1,267 12,627 1,267 12,627
Allowance for credit losses at period end 52,086 67,712 52,086 67,712
Allowance for credit losses at period end, Individually evaluated for impairment 5,892 21,998 5,892 21,998
Allowance for credit losses at period end, Collectively evaluated for impairment 46,080 45,714 46,080 45,714
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality 114 0 114 0
Loans at period end, Individually evaluated for impairment 124,401 160,711 124,401 160,711
Loans at period end, Collectively evaluated for impairment 3,963,310 3,490,161 3,963,310 3,490,161
Loans at period end, Loans acquired with deteriorated credit quality 58,399 48,840 58,399 48,840
Home equity
        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Allowance for loan losses at beginning of period 14,205 13,878 12,734 7,712
Other adjustments 0 (2) 0 (4)
Reclassification from (to) allowance for unfunded lending-related commitments 0 0 0 0
Charge-offs (711) (1,543) (4,893) (5,865)
Recoveries 43 52 376 385
Provision for credit losses 1,824 1,215 7,144 11,372
Allowance for loan losses at period end 15,361 13,600 15,361 13,600
Allowance for unfunded lending-related commitments at period end 0 0 0 0
Allowance for credit losses at period end 15,361 13,600 15,361 13,600
Allowance for credit losses at period end, Individually evaluated for impairment 2,447 3,011 2,447 3,011
Allowance for credit losses at period end, Collectively evaluated for impairment 12,914 10,589 12,914 10,589
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality 0 0 0 0
Loans at period end, Individually evaluated for impairment 11,152 13,118 11,152 13,118
Loans at period end, Collectively evaluated for impairment 725,468 794,474 725,468 794,474
Loans at period end, Loans acquired with deteriorated credit quality 0 0 0 0
Residential real-estate
        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Allowance for loan losses at beginning of period 4,825 6,724 5,560 5,028
Other adjustments (4) (90) (98) (111)
Reclassification from (to) allowance for unfunded lending-related commitments 0 0 0 0
Charge-offs (328) (1,027) (2,573) (1,590)
Recoveries 64 8 87 13
Provision for credit losses 700 1,938 2,281 4,213
Allowance for loan losses at period end 5,257 7,553 5,257 7,553
Allowance for unfunded lending-related commitments at period end 0 0 0 0
Allowance for credit losses at period end 5,257 7,553 5,257 7,553
Allowance for credit losses at period end, Individually evaluated for impairment 886 3,244 886 3,244
Allowance for credit losses at period end, Collectively evaluated for impairment 4,371 4,306 4,371 4,306
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality 0 3 0 3
Loans at period end, Individually evaluated for impairment 16,746 18,696 16,746 18,696
Loans at period end, Collectively evaluated for impairment 379,462 357,326 379,462 357,326
Loans at period end, Loans acquired with deteriorated credit quality 1,499 656 1,499 656
Premium finance receivables
        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Allowance for loan losses at beginning of period 5,268 8,522 6,096 7,214
Other adjustments 7 0 (5) 0
Reclassification from (to) allowance for unfunded lending-related commitments 0 0 0 0
Charge-offs (1,297) (886) (3,671) (2,483)
Recoveries 316 206 889 675
Provision for credit losses 1,193 (955) 2,178 1,481
Allowance for loan losses at period end 5,487 6,887 5,487 6,887
Allowance for unfunded lending-related commitments at period end 0 0 0 0
Allowance for credit losses at period end 5,487 6,887 5,487 6,887
Allowance for credit losses at period end, Individually evaluated for impairment 0 0 0 0
Allowance for credit losses at period end, Collectively evaluated for impairment 5,487 6,887 5,487 6,887
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality 0 0 0 0
Loans at period end, Individually evaluated for impairment 0 0 0 0
Loans at period end, Collectively evaluated for impairment 3,560,337 3,111,533 3,560,337 3,111,533
Loans at period end, Loans acquired with deteriorated credit quality 459,883 537,032 459,883 537,032
Indirect consumer
        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Allowance for loan losses at beginning of period 263 640 267 645
Other adjustments 0 0 0 0
Reclassification from (to) allowance for unfunded lending-related commitments 0 0 0 0
Charge-offs (23) (73) (71) (157)
Recoveries 12 25 44 76
Provision for credit losses (51) (323) (39) (295)
Allowance for loan losses at period end 201 269 201 269
Allowance for unfunded lending-related commitments at period end 0 0 0 0
Allowance for credit losses at period end 201 269 201 269
Allowance for credit losses at period end, Individually evaluated for impairment 0 1 0 1
Allowance for credit losses at period end, Collectively evaluated for impairment 201 268 201 268
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality 0 0 0 0
Loans at period end, Individually evaluated for impairment 79 69 79 69
Loans at period end, Collectively evaluated for impairment 57,157 77,309 57,157 77,309
Loans at period end, Loans acquired with deteriorated credit quality 0 0 0 0
Consumer and other
        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Allowance for loan losses at beginning of period 1,594 1,372 1,765 2,140
Other adjustments 0 0 0 0
Reclassification from (to) allowance for unfunded lending-related commitments 0 0 0 0
Charge-offs (193) (93) (402) (454)
Recoveries 39 28 177 226
Provision for credit losses 382 (155) 282 (760)
Allowance for loan losses at period end 1,822 1,152 1,822 1,152
Allowance for unfunded lending-related commitments at period end 0 0 0 0
Allowance for credit losses at period end 1,822 1,152 1,822 1,152
Allowance for credit losses at period end, Individually evaluated for impairment 252 480 252 480
Allowance for credit losses at period end, Collectively evaluated for impairment 1,570 672 1,570 672
Allowance for credit losses at period end, Loans acquired with deteriorated credit quality 0 0 0 0
Loans at period end, Individually evaluated for impairment 1,695 1,582 1,695 1,582
Loans at period end, Collectively evaluated for impairment 112,151 107,273 112,151 107,273
Loans at period end, Loans acquired with deteriorated credit quality $ 179 $ 67 $ 179 $ 67