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Allowance for Loan and Lease Losses - Activity (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
segment
class
Dec. 31, 2016
USD ($)
Dec. 31, 2015
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 $ 135,494 $ 135,484 $ 134,799
Charge-offs (25,925) (19,938) (19,796)
Recoveries 9,184 11,348 10,581
Increase (decrease) in Provision 18,500 8,600 9,900
Balance at end of year 137,253 135,494 135,484
Allowance for loan and lease losses:      
Individually evaluated for impairment 494 1,092 592
Collectively evaluated for impairment 136,759 134,402 134,892
Loans and leases:      
Individually evaluated for impairment 45,349 59,428 44,147
Collectively evaluated for impairment 12,232,020 11,460,950 10,677,883
Total loans and leases $ 12,277,369 11,520,378 10,722,030
Commercial Lending      
Allowance for loan and lease losses      
Number of distinct portfolios | class 4    
Loans and leases:      
Total loans and leases $ 6,600,840 6,213,147  
Commercial and Industrial      
Activity in allowance for loan losses      
Balance at beginning of year 33,129 34,025 31,835
Charge-offs (1,519) (348) (866)
Recoveries 844 251 940
Increase (decrease) in Provision 1,552 (799) 2,116
Balance at end of year 34,006 33,129 34,025
Allowance for loan and lease losses:      
Individually evaluated for impairment 4 380  
Collectively evaluated for impairment 34,002 32,749 34,025
Loans and leases:      
Individually evaluated for impairment 18,183 27,572 15,845
Collectively evaluated for impairment 3,117,083 3,212,028 3,041,610
Total loans and leases 3,135,266 3,239,600 3,057,455
Commercial Real Estate      
Activity in allowance for loan losses      
Balance at beginning of year 18,448 18,489 16,320
Recoveries 596 3,329 1,115
Increase (decrease) in Provision (1,000) (3,370) 1,054
Balance at end of year 18,044 18,448 18,489
Allowance for loan and lease losses:      
Individually evaluated for impairment 6 7  
Collectively evaluated for impairment 18,038 18,441 18,489
Loans and leases:      
Individually evaluated for impairment 10,636 12,545 5,787
Collectively evaluated for impairment 2,656,961 2,330,950 2,158,661
Total loans and leases 2,667,597 2,343,495 2,164,448
Construction      
Activity in allowance for loan losses      
Balance at beginning of year 4,513 3,793 4,725
Increase (decrease) in Provision 2,304 720 (932)
Balance at end of year 6,817 4,513 3,793
Allowance for loan and lease losses:      
Collectively evaluated for impairment 6,817 4,513 3,793
Loans and leases:      
Collectively evaluated for impairment 632,911 450,012 367,460
Total loans and leases 632,911 450,012 367,460
Lease Financing      
Activity in allowance for loan losses      
Balance at beginning of year 847 888 1,089
Charge-offs (147)    
Recoveries   2 3
Increase (decrease) in Provision (89) (43) (204)
Balance at end of year 611 847 888
Allowance for loan and lease losses:      
Collectively evaluated for impairment 611 847 888
Loans and leases:      
Individually evaluated for impairment   153 181
Collectively evaluated for impairment 165,066 179,887 198,498
Total loans and leases 165,066 180,040 198,679
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 43,436 46,099 44,858
Charge-offs (408) (799) (618)
Recoveries 687 1,358 2,198
Increase (decrease) in Provision (863) (3,222) (339)
Balance at end of year 42,852 43,436 46,099
Allowance for loan and lease losses:      
Individually evaluated for impairment 484 705 592
Collectively evaluated for impairment 42,368 42,731 45,507
Loans and leases:      
Individually evaluated for impairment 16,530 19,158 22,334
Collectively evaluated for impairment 4,073,523 3,777,301 3,510,093
Total loans and leases 4,090,053 3,796,459 3,532,427
Consumer      
Activity in allowance for loan losses      
Balance at beginning of year 28,388 28,385 27,041
Charge-offs (23,851) (18,791) (18,312)
Recoveries 7,057 6,408 6,325
Increase (decrease) in Provision 19,655 12,386 13,331
Balance at end of year 31,249 28,388 28,385
Allowance for loan and lease losses:      
Collectively evaluated for impairment 31,249 28,388 28,385
Loans and leases:      
Collectively evaluated for impairment 1,586,476 1,510,772 1,401,561
Total loans and leases 1,586,476 1,510,772 1,401,561
Unallocated      
Activity in allowance for loan losses      
Balance at beginning of year 6,733 3,805 8,931
Increase (decrease) in Provision (3,059) 2,928 (5,126)
Balance at end of year 3,674 6,733 3,805
Allowance for loan and lease losses:      
Collectively evaluated for impairment $ 3,674 $ 6,733 $ 3,805