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Allowance for Loan and Lease Losses - Activity (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
segment
class
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Allowance for loan and lease losses      
Number of primary portfolio segments | segment 3    
Activity in allowance for loan losses      
Balance at beginning of year $ 135,484 $ 134,799 $ 133,239
Charge-offs (19,938) (19,796) (18,675)
Recoveries 11,348 10,581 9,135
Increase (decrease) in Provision 8,600 9,900 11,100
Balance at end of year 135,494 135,484 134,799
Individually evaluated for impairment 1,092 592 1,363
Collectively evaluated for impairment 134,402 134,892 133,436
Loans and leases:      
Individually evaluated for impairment 59,428 44,147 59,219
Collectively evaluated for impairment 11,460,950 10,677,883 9,964,371
Total loans and leases $ 11,520,378 10,722,030 10,023,590
Commercial Lending      
Allowance for loan and lease losses      
Number of distinct portfolios | class 4    
Loans and leases:      
Total loans and leases $ 6,213,147 5,788,042  
Commercial and Industrial      
Activity in allowance for loan losses      
Balance at beginning of year 34,025 31,835 34,026
Charge-offs (348) (866) (2,298)
Recoveries 251 940 1,387
Increase (decrease) in Provision (799) 2,116 (1,280)
Balance at end of year 33,129 34,025 31,835
Individually evaluated for impairment 380   571
Collectively evaluated for impairment 32,749 34,025 31,264
Loans and leases:      
Individually evaluated for impairment 27,572 15,845 16,662
Collectively evaluated for impairment 3,212,028 3,041,610 2,680,480
Total loans and leases 3,239,600 3,057,455 2,697,142
Commercial Real Estate      
Activity in allowance for loan losses      
Balance at beginning of year 18,489 16,320 16,606
Recoveries 3,329 1,115 207
Increase (decrease) in Provision (3,370) 1,054 (493)
Balance at end of year 18,448 18,489 16,320
Individually evaluated for impairment 7   52
Collectively evaluated for impairment 18,441 18,489 16,268
Loans and leases:      
Individually evaluated for impairment 12,545 5,787 6,403
Collectively evaluated for impairment 2,330,950 2,158,661 2,041,062
Total loans and leases 2,343,495 2,164,448 2,047,465
Construction      
Activity in allowance for loan losses      
Balance at beginning of year 3,793 4,725 4,702
Increase (decrease) in Provision 720 (932) 23
Balance at end of year 4,513 3,793 4,725
Collectively evaluated for impairment 4,513 3,793 4,725
Loans and leases:      
Individually evaluated for impairment     4,579
Collectively evaluated for impairment 450,012 367,460 465,482
Total loans and leases 450,012 367,460 470,061
Lease Financing      
Activity in allowance for loan losses      
Balance at beginning of year 888 1,089 1,078
Recoveries 2 3 57
Increase (decrease) in Provision (43) (204) (46)
Balance at end of year 847 888 1,089
Collectively evaluated for impairment 847 888 1,089
Loans and leases:      
Individually evaluated for impairment 153 181 187
Collectively evaluated for impairment 179,887 198,498 244,111
Total loans and leases 180,040 198,679 244,298
Residential      
Allowance for loan and lease losses      
Specific allocation for impaired loans in which the net collateral value exceeds the unpaid principal balance of the loan 0    
Activity in allowance for loan losses      
Balance at beginning of year 46,099 44,858 42,028
Charge-offs (799) (618) (1,086)
Recoveries 1,358 2,198 1,470
Increase (decrease) in Provision (3,222) (339) 2,446
Balance at end of year 43,436 46,099 44,858
Individually evaluated for impairment 705 592 740
Collectively evaluated for impairment 42,731 45,507 44,118
Loans and leases:      
Individually evaluated for impairment 19,158 22,334 31,388
Collectively evaluated for impairment 3,777,301 3,510,093 3,306,633
Total loans and leases 3,796,459 3,532,427 3,338,021
Consumer      
Activity in allowance for loan losses      
Balance at beginning of year 28,385 27,041 25,589
Charge-offs (18,791) (18,312) (15,291)
Recoveries 6,408 6,325 6,014
Increase (decrease) in Provision 12,386 13,331 10,729
Balance at end of year 28,388 28,385 27,041
Collectively evaluated for impairment 28,388 28,385 27,041
Loans and leases:      
Collectively evaluated for impairment 1,510,772 1,401,561 1,226,603
Total loans and leases 1,510,772 1,401,561 1,226,603
Unallocated      
Activity in allowance for loan losses      
Balance at beginning of year 3,805 8,931 9,210
Increase (decrease) in Provision 2,928 (5,126) (279)
Balance at end of year 6,733 3,805 8,931
Collectively evaluated for impairment $ 6,733 $ 3,805 $ 8,931