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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning Balance $ 197,257 $ 199,807 $ 202,068 $ 210,242  
Charge-offs (10,670) (10,362) (28,913) (46,270)  
Recoveries 8,280 8,112 24,712 26,585  
Provision/(provision credit) for loan losses 0 4,000 (3,000) 11,000  
Ending Balance 194,867 201,557 194,867 201,557  
Allowance - individually evaluated for impairment 43,804 49,614 43,804 49,614  
Allowance - collectively evaluated for impairment 147,928 150,777 147,928 150,777  
Allowance - purchased credit impaired loans 3,135 1,166 3,135 1,166 $ 700
Individually evaluated for impairment 254,831 305,973 254,831 305,973  
Collectively evaluated for impairment 19,885,440 19,192,515 19,885,440 19,192,515  
Purchase credit impaired loans - recorded investment 25,820 57,299 25,820 57,299  
Loans and Leases Receivable, Net of Deferred Income 20,166,091 [1] 19,555,787 20,166,091 [1] 19,555,787 19,589,520 [1]
Commercial Financial And Industrial Portfolio Segment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning Balance 92,379 80,972 89,398 73,637  
Charge-offs (3,723) (1,992) (6,188) (16,386)  
Recoveries 601 725 2,877 3,107  
Provision/(provision credit) for loan losses 8,948 7,161 12,118 26,508  
Ending Balance 98,205 86,866 98,205 86,866  
Allowance - individually evaluated for impairment 6,895 5,187 6,895 5,187  
Allowance - collectively evaluated for impairment 88,529 81,376 88,529 81,376  
Allowance - purchased credit impaired loans 2,781 303 2,781 303  
Individually evaluated for impairment 32,028 49,351 32,028 49,351  
Collectively evaluated for impairment 12,739,091 12,022,457 12,739,091 12,022,457  
Purchase credit impaired loans - recorded investment 20,725 46,490 20,725 46,490  
Loans and Leases Receivable, Net of Deferred Income 12,791,844 12,118,298 12,791,844 12,118,298 12,148,087
Commercial Real Estate Portfolio Segment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning Balance 30,470 30,264 33,852 25,159  
Charge-offs 0 (49) (20) (742)  
Recoveries 278 651 639 1,782  
Provision/(provision credit) for loan losses (1,065) 1,554 (4,788) 6,221  
Ending Balance 29,683 32,420 29,683 32,420  
Allowance - individually evaluated for impairment 126 216 126 216  
Allowance - collectively evaluated for impairment 29,557 31,674 29,557 31,674  
Allowance - purchased credit impaired loans 0 530 0 530  
Individually evaluated for impairment 2,320 3,302 2,320 3,302  
Collectively evaluated for impairment 2,244,895 2,053,101 2,244,895 2,053,101  
Purchase credit impaired loans - recorded investment 3,800 9,192 3,800 9,192  
Loans and Leases Receivable, Net of Deferred Income 2,251,015 2,065,595 2,251,015 2,065,595 2,135,523
Consumer Real Estate Portfolio Segment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning Balance 46,069 59,081 50,357 80,614  
Charge-offs (3,601) (4,359) (11,401) (17,867)  
Recoveries 6,188 5,591 17,007 17,408  
Provision/(provision credit) for loan losses (7,717) (7,078) (15,024) (26,920)  
Ending Balance 40,939 53,235 40,939 53,235  
Allowance - individually evaluated for impairment 23,936 29,461 23,936 29,461  
Allowance - collectively evaluated for impairment 16,649 23,441 16,649 23,441  
Allowance - purchased credit impaired loans 354 333 354 333  
Individually evaluated for impairment 135,858 158,909 135,858 158,909  
Collectively evaluated for impairment 4,232,564 4,417,896 4,232,564 4,417,896  
Purchase credit impaired loans - recorded investment 1,295 1,566 1,295 1,566  
Loans and Leases Receivable, Net of Deferred Income 4,369,717 4,578,371 4,369,717 4,578,371 4,523,752
Permanent Mortgage Portfolio Segment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning Balance 16,398 17,600 16,289 18,947  
Charge-offs (173) (373) (1,499) (834)  
Recoveries 542 239 1,933 1,502  
Provision/(provision credit) for loan losses (1,048) (877) (1,004) (3,026)  
Ending Balance 15,719 16,589 15,719 16,589  
Allowance - individually evaluated for impairment 12,601 14,611 12,601 14,611  
Allowance - collectively evaluated for impairment 3,118 1,978 3,118 1,978  
Allowance - purchased credit impaired loans 0 0 0 0  
Individually evaluated for impairment 84,081 94,071 84,081 94,071  
Collectively evaluated for impairment 319,001 342,029 319,001 342,029  
Purchase credit impaired loans - recorded investment 0 0 0 0  
Loans and Leases Receivable, Net of Deferred Income 403,082 436,100 403,082 436,100 423,125
Credit Card And Other Portfolio Segment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Beginning Balance 11,941 11,890 12,172 11,885  
Charge-offs (3,173) (3,589) (9,805) (10,441)  
Recoveries 671 906 2,256 2,786  
Provision/(provision credit) for loan losses 882 3,240 5,698 8,217  
Ending Balance 10,321 12,447 10,321 12,447  
Allowance - individually evaluated for impairment 246 139 246 139  
Allowance - collectively evaluated for impairment 10,075 12,308 10,075 12,308  
Allowance - purchased credit impaired loans 0 0 0 0  
Individually evaluated for impairment 544 340 544 340  
Collectively evaluated for impairment 349,889 357,032 349,889 357,032  
Purchase credit impaired loans - recorded investment 0 51 0 51  
Loans and Leases Receivable, Net of Deferred Income $ 350,433 $ 357,423 $ 350,433 $ 357,423 $ 359,033
[1] September 30, 2017 and December 31, 2016 include $24.8 million and $28.5 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate properties in process of foreclosure.