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Loans and Allowance for Loan Losses (Details 6) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Activity in ALLL by class of loans    
Beginning balance $ 37,656 $ 35,745
Charge-offs (2,644) (3,097)
Recoveries 613 493
Net charge-offs (2,031) (2,604)
Provisions charged to operations 3,100 4,515
Individually evaluated for impairment 7,005 7,958
Collectively evaluated for impairment 31,720 29,698
Individually evaluated for impairment 66,351 71,229
Collectively evaluated for impairment 3,168,733 2,929,267
Loans acquired with deteriorated credit quality 7,343 13,002
Ending balance 38,725 37,656
Ending balance 3,242,427 3,013,498
Non-residential real estate [Member]
    
Activity in ALLL by class of loans    
Beginning balance 13,948 13,142
Charge-offs (291) (353)
Recoveries 56 23
Net charge-offs (235) (330)
Provisions charged to operations 1,256 1,136
Individually evaluated for impairment 2,759 3,295
Collectively evaluated for impairment 12,210 10,653
Individually evaluated for impairment 36,765 38,897
Collectively evaluated for impairment 1,185,480 1,012,301
Ending balance 14,969 13,948
Ending balance 1,222,245 1,051,198
Residential real estate [Member]
    
Activity in ALLL by class of loans    
Beginning balance 9,764 8,957
Charge-offs (616) (752)
Recoveries 134 141
Net charge-offs (482) (611)
Provisions charged to operations 533 1,418
Individually evaluated for impairment 2,303 2,636
Collectively evaluated for impairment 7,512 7,128
Individually evaluated for impairment 19,492 20,806
Collectively evaluated for impairment 735,441 673,817
Ending balance 9,815 9,764
Ending balance 754,933 694,623
Non-consumer non-real estate [Member]
    
Activity in ALLL by class of loans    
Beginning balance 9,156 9,587
Charge-offs (590) (524)
Recoveries 171 156
Net charge-offs (419) (368)
Provisions charged to operations 648 (63)
Individually evaluated for impairment 1,403 1,445
Collectively evaluated for impairment 7,982 7,711
Individually evaluated for impairment 7,599 8,458
Collectively evaluated for impairment 777,524 718,232
Ending balance 9,385 9,156
Ending balance 785,123 726,690
Consumer non-real estate [Member]
    
Activity in ALLL by class of loans    
Beginning balance 2,315 2,301
Charge-offs (509) (652)
Recoveries 194 120
Net charge-offs (315) (532)
Provisions charged to operations 451 546
Individually evaluated for impairment 287 328
Collectively evaluated for impairment 2,164 1,987
Individually evaluated for impairment 2,260 2,807
Collectively evaluated for impairment 219,487 197,409
Ending balance 2,451 2,315
Ending balance 221,747 200,216
Other loans [Member]
    
Activity in ALLL by class of loans    
Beginning balance 1,886 1,758
Charge-offs (265) (270)
Recoveries 34 28
Net charge-offs (231) (242)
Provisions charged to operations 230 370
Individually evaluated for impairment 253 254
Collectively evaluated for impairment 1,632 1,632
Individually evaluated for impairment 235 261
Collectively evaluated for impairment 149,662 158,782
Ending balance 1,885 1,886
Ending balance 149,897 159,043
Acquired loans [Member]
    
Activity in ALLL by class of loans    
Beginning balance 587  
Charge-offs (373) (546)
Recoveries 24 25
Net charge-offs (349) (521)
Provisions charged to operations (18) 1,108
Collectively evaluated for impairment 220 587
Collectively evaluated for impairment 101,139 168,726
Loans acquired with deteriorated credit quality 7,343 13,002
Ending balance 220 587
Ending balance $ 108,482 $ 181,728