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Loans and Allowance for Credit Losses (Tables)
 6 Months Ended
Jun. 30, 2016
Loans and Allowance for Credit Losses [Abstract]  
Schedule of major classifications of loans
    June 30,     December 31,  
    2016     2015  
             
Owner occupied commercial real estate   $ 1,450,075     $ 1,493,966  
Income producing commercial real estate     918,963       823,729  
Commercial & industrial     925,578       785,417  
Commercial construction     383,558       342,078  
Total commercial     3,678,174       3,445,190  
Residential mortgage     1,035,467       1,029,663  
Home equity lines of credit     622,804       597,806  
Residential construction     350,877       351,700  
Consumer installment     124,067       115,111  
Indirect auto     475,138       455,971  
                 
Total loans     6,286,527       5,995,441  
                 
Less allowance for loan losses     (64,253 )     (68,448 )
                 
Loans, net   $ 6,222,274     $ 5,926,993  
Schedule of changes in the value of the accretable yield for acquired loans accounted
    Three Months Ended June 30,     Six Months Ended June 30,  
    2016     2015     2016     2015  
Balance at beginning of period   $ 4,144     $ -     $ 4,279     $ -  
Additions due to acquisitions     -       1,029       -       1,029  
Accretion     (626 )     (83 )     (1,942 )     (83 )
Reclassification from nonaccretable difference     806       -       1,453       -  
Changes in expected cash flows that do not affect nonaccretable difference     1,013       -       1,547       -  
Balance at end of period   $ 5,337     $ 946     $ 5,337     $ 946  
Schedule of balance and activity in the allowance for credit losses by portfolio segment
    2016     2015  
Three Months Ended June 30,   Beginning
Balance		     Charge-
Offs		     Recoveries     (Release)
Provision		     Ending
Balance		     Beginning
Balance		     Charge-
Offs		     Recoveries     (Release)
Provision		     Ending
Balance		  
                                                             
Owner occupied commercial real estate   $ 16,864     $ (610 )   $ 46     $ (1,868 )   $ 14,432     $ 14,952     $ (363 )   $ 78     $ 1,672     $ 16,339  
Income producing commercial real estate     6,020       (121 )     144       (521 )     5,522       9,655       (74 )     350       (1,731 )     8,200  
Commercial & industrial     3,153       (223 )     615       (338 )     3,207       3,442       (162 )     789       659       4,728  
Commercial construction     8,938       (24 )     2       22       8,938       5,335       (147 )     51       (344 )     4,895  
Residential mortgage     14,205       (1,060 )     231       2,286       15,662       20,138       (1,109 )     322       (299 )     19,052  
Home equity lines of credit     5,995       (469 )     216       (424 )     5,318       4,321       (348 )     26       1,480       5,479  
Residential construction     9,034       (270 )     278       (37 )     9,005       10,210       (499 )     392       (766 )     9,337  
Consumer installment     773       (390 )     229       111       723       713       (349 )     187       137       688  
Indirect auto     1,328       (366 )     42       442       1,446       1,241       (130 )     8       292       1,411  
Total allowance for loan losses     66,310       (3,533 )     1,803       (327 )     64,253       70,007       (3,181 )     2,203       1,100       70,129  
Allowance for unfunded commitments     2,342       -       -       27       2,369       2,780       -       -       (200 )     2,580  
Total allowance for credit losses   $ 68,652     $ (3,533 )   $ 1,803     $ (300 )   $ 66,622     $ 72,787     $ (3,181 )   $ 2,203     $ 900     $ 72,709  

 

Six Months Ended June 30,   Beginning
Balance		     Charge-
Offs		     Recoveries     (Release)
Provision		     Ending
Balance		     Beginning
Balance		     Charge-
Offs		     Recoveries     (Release)
Provision		     Ending
Balance		  
                                                                                 
Owner occupied commercial real estate   $ 16,732     $ (1,012 )   $ 143     $ (1,431 )   $ 14,432     $ 16,041     $ (731 )   $ 89     $ 940     $ 16,339  
Income producing commercial real estate     8,235       (343 )     155       (2,525 )     5,522       10,296       (322 )     357       (2,131 )     8,200  
Commercial & industrial     4,442       (795 )     904       (1,344 )     3,207       3,255       (631 )     917       1,187       4,728  
Commercial construction     5,583       (311 )     2       3,664       8,938       4,747       (169 )     51       266       4,895  
Residential mortgage     17,232       (1,236 )     358       (692 )     15,662       20,311       (1,687 )     484       (56 )     19,052  
Home equity lines of credit     6,042       (1,192 )     307       161       5,318       4,574       (421 )     40       1,286       5,479  
Residential construction     7,961       (329 )     441       932       9,005       10,603       (1,639 )     471       (98 )     9,337  
Consumer installment     828       (869 )     435       329       723       731       (675 )     563       69       688  
Indirect auto     1,393       (599 )     73       579       1,446       1,061       (258 )     21       587       1,411  
Total allowance for loan losses     68,448       (6,686 )     2,818       (327 )     64,253       71,619       (6,533 )     2,993       2,050       70,129  
Allowance for unfunded commitments     2,542       -       -       (173 )     2,369       1,930       -       -       650       2,580  
Total allowance for credit losses   $ 70,990     $ (6,686 )   $ 2,818     $ (500 )   $ 66,622     $ 73,549     $ (6,533 )   $ 2,993     $ 2,700     $ 72,709  
 
    Allowance for Loan Losses  
    June 30, 2016     December 31, 2015  
    Individually
evaluated for
impairment		     Collectively
evaluated for
impairment		     PCI     Ending
Balance		     Individually
evaluated for
impairment		     Collectively
evaluated for
impairment		     PCI     Ending
Balance		  
                                                 
Owner occupied commercial real estate   $ 1,444     $ 12,988     $ -     $ 14,432     $ 1,465     $ 15,267     $ -     $ 16,732  
Income producing commercial real estate     399       5,123       -       5,522       961       7,274       -       8,235  
Commercial & industrial     71       2,980       156       3,207       280       4,162       -       4,442  
Commercial construction     46       8,856       36       8,938       13       5,570       -       5,583  
Residential mortgage     3,944       11,639       79       15,662       3,885       13,347       -       17,232  
Home equity lines of credit     3       5,259       56       5,318       6       6,036       -       6,042  
Residential construction     141       8,857       7       9,005       174       7,787       -       7,961  
Consumer installment     9       714       -       723       13       815       -       828  
Indirect auto     -       1,446       -       1,446       -       1,393       -       1,393  
Total allowance for loan losses     6,057       57,862       334       64,253       6,797       61,651       -       68,448  
Allowance for unfunded commitments     -       2,369       -       2,369       -       2,542       -       2,542  
Total allowance for credit losses   $ 6,057     $ 60,231     $ 334     $ 66,622     $ 6,797     $ 64,193     $ -     $ 70,990  

 

    Loans Outstanding  
    June 30, 2016     December 31, 2015  
    Individually
evaluated for
impairment		     Collectively
evaluated for 
impairment		     PCI     Ending
Balance		     Individually
evaluated for
impairment		     Collectively
evaluated for
impairment		     PCI     Ending
Balance		  
                                                 
Owner occupied commercial real estate   $ 31,527     $ 1,410,209     $ 8,339     $ 1,450,075     $ 38,268     $ 1,442,024     $ 13,674     $ 1,493,966  
Income producing commercial real estate     23,647       873,916       21,400       918,963       23,013       772,945       27,771       823,729  
Commercial & industrial     2,771       921,657       1,150       925,578       3,339       781,423       655       785,417  
Commercial construction     1,865       376,745       4,948       383,558       10,616       329,320       2,142       342,078  
Residential mortgage     23,421       1,008,835       3,211       1,035,467       19,627       1,005,860       4,176       1,029,663  
Home equity lines of credit     101       621,525       1,178       622,804       167       595,951       1,688       597,806  
Residential construction     5,971       344,428       478       350,877       7,900       342,677       1,123       351,700  
Consumer installment     315       123,744       8       124,067       329       114,741       41       115,111  
Indirect auto     937       474,179       22       475,138       749       455,173       49       455,971  
Total loans   $ 90,555     $ 6,155,238     $ 40,734     $ 6,286,527     $ 104,008     $ 5,840,114     $ 51,319     $ 5,995,441  
Schedule of recorded investments in individually evaluated impaired loans
    June 30, 2016     December 31, 2015  
    Unpaid
Principal
Balance		     Recorded
Investment		     Allowance
for Loan
Losses
Allocated		     Unpaid
Principal
Balance		     Recorded
Investment		     Allowance
for Loan
Losses
Allocated		  
                                     
With no related allowance recorded:                                                
Owner occupied commercial real estate   $ 8,083     $ 7,630     $ -     $ 14,793     $ 14,460     $ -  
Income producing commercial real estate     12,550       12,550       -       13,044       12,827       -  
Commercial & industrial     447       447       -       493       469       -  
Commercial construction     380       380       -       -       -       -  
Total commercial     21,460       21,007       -       28,330       27,756       -  
Residential mortgage     4,515       4,513       -       791       791       -  
Home equity lines of credit     -       -       -       -       -       -  
Residential construction     1,444       1,393       -       3,731       3,429       -  
Consumer installment     -       -       -       -       -       -  
Indirect auto     937       937       -       749       749       -  
Total with no related allowance recorded     28,356       27,850       -       33,601       32,725       -  
                                                 
With an allowance recorded:                                                
Owner occupied commercial real estate     24,053       23,897       1,444       24,043       23,808       1,465  
Income producing commercial real estate     11,097       11,097       399       10,281       10,186       961  
Commercial & industrial     2,404       2,324       71       2,957       2,870       280  
Commercial construction     1,654       1,485       46       10,787       10,616       13  
Total commercial     39,208       38,803       1,960       48,068       47,480       2,719  
Residential mortgage     19,195       18,908       3,944       19,346       18,836       3,885  
Home equity lines of credit     101       101       3       167       167       6  
Residential construction     4,963       4,578       141       4,854       4,471       174  
Consumer installment     335       315       9       354       329       13  
Indirect auto     -       -       -       -       -       -  
Total with an allowance recorded     63,802       62,705       6,057       72,789       71,283       6,797  
Total   $ 92,158     $ 90,555     $ 6,057     $ 106,390     $ 104,008     $ 6,797  
Schedule of average balances of impaired loans and income recognized on impaired loans
    2016     2015  
Three Months Ended June 30,   Average
Balance		     Interest
Revenue
Recognized
During
Impairment		     Cash Basis
Interest
Revenue
Received		     Average
Balance		     Interest
Revenue
Recognized
During
Impairment		     Cash Basis
Interest
Revenue
Received		  
                                     
Owner occupied commercial real estate   $ 31,747     $ 379     $ 388     $ 37,985     $ 469     $ 509  
Income producing commercial real estate     23,768       284       295       22,055       273       253  
Commercial & industrial     2,706       35       35       5,221       45       89  
Commercial construction     1,872       22       21       12,164       117       116  
Total commercial     60,093       720       739       77,425       904       967  
Residential mortgage     23,631       263       265       20,604       200       203  
Home equity lines of credit     101       1       1       558       5       5  
Residential construction     6,152       71       80       8,748       128       132  
Consumer installment     320       6       5       161       3       3  
Indirect auto     867       11       11       -       -       -  
Total   $ 91,164     $ 1,072     $ 1,101     $ 107,496     $ 1,240     $ 1,310  
                                                 
Six Months Ended June 30,                                                
                                                 
Owner occupied commercial real estate   $ 32,111     $ 809     $ 835     $ 37,487     $ 929     $ 968  
Income producing commercial real estate     23,857       568       597       21,740       540       529  
Commercial & industrial     2,771       66       62       4,622       83       125  
Commercial construction     1,881       44       44       12,219       233       237  
Total commercial     60,620       1,487       1,538       76,068       1,785       1,859  
Residential mortgage     23,778       469       468       21,345       425       436  
Home equity lines of credit     101       2       2       518       10       10  
Residential construction     6,254       138       143       9,662       248       258  
Consumer installment     327       12       12       157       6       6  
Indirect auto     830       22       22       -       -       -  
Total   $ 91,910     $ 2,130     $ 2,185     $ 107,750     $ 2,474     $ 2,569  
Schedule of recorded investment in nonaccrual loans by loan class
    June 30,     December 31,  
    2016     2015  
             
Owner occupied commercial real estate   $ 6,681     $ 7,036  
Income producing commercial real estate     1,017       2,595  
Commercial & industrial     949       892  
Commercial construction     199       328  
Total commercial     8,846       10,851  
Residential mortgage     8,667       8,555  
Home equity lines of credit     1,308       851  
Residential construction     1,578       1,398  
Consumer installment     137       175  
Indirect auto     812       823  
Total   $ 21,348     $ 22,653  
Schedule of aging of the recorded investment in past due loans
    Loans Past Due     Loans Not              
As of June 30, 2016   30 - 59 Days     60 - 89 Days     > 90 Days     Total     Past Due     PCI Loans     Total  
                                           
Owner occupied commercial real estate   $ 1,432     $ 1,157     $ 2,167     $ 4,756     $ 1,436,980     $ 8,339     $ 1,450,075  
Income producing commercial real estate     321       892       192       1,405       896,158       21,400       918,963  
Commercial & industrial     2,695       45       448       3,188       921,240       1,150       925,578  
Commercial construction     107       -       131       238       378,372       4,948       383,558  
Total commercial     4,555       2,094       2,938       9,587       3,632,750       35,837       3,678,174  
Residential mortgage     5,579       1,563       3,155       10,297       1,021,959       3,211       1,035,467  
Home equity lines of credit     1,450       318       611       2,379       619,247       1,178       622,804  
Residential construction     786       926       389       2,101       348,298       478       350,877  
Consumer installment     386       208       25       619       123,440       8       124,067  
Indirect auto     803       243       389       1,435       473,681       22       475,138  
Total loans   $ 13,559     $ 5,352     $ 7,507     $ 26,418     $ 6,219,375     $ 40,734     $ 6,286,527  
                                                         
As of December 31, 2015                                                        
                                                         
Owner occupied commercial real estate   $ 3,733     $ 1,686     $ 1,400     $ 6,819     $ 1,473,473     $ 13,674     $ 1,493,966  
Income producing commercial real estate     204       1,030       621       1,855       794,103       27,771       823,729  
Commercial & industrial     858       88       489       1,435       783,327       655       785,417  
Commercial construction     159       -       76       235       339,701       2,142       342,078  
Total commercial     4,954       2,804       2,586       10,344       3,390,604       44,242       3,445,190  
Residential mortgage     5,111       1,338       3,544       9,993       1,015,494       4,176       1,029,663  
Home equity lines of credit     1,118       188       287       1,593       594,525       1,688       597,806  
Residential construction     2,180       239       344       2,763       347,814       1,123       351,700  
Consumer installment     610       115       83       808       114,262       41       115,111  
Indirect auto     611       311       561       1,483       454,439       49       455,971  
Total loans   $ 14,584     $ 4,995     $ 7,405     $ 26,984     $ 5,917,138     $ 51,319     $ 5,995,441  
Schedule of TDRs including the number of loan contracts restructured and the pre- and post-modification recorded investment
    June 30, 2016     December 31, 2015  
    Number of
Contracts		     Pre-
Modification
Outstanding
Recorded
Investment		     Post-
Modification
Outstanding
Recorded
Investment		     Number of
Contracts		     Pre-
Modification
Outstanding
Recorded
Investment		     Post-
Modification
Outstanding
Recorded
Investment		  
Owner occupied commercial real estate     56     $ 26,515     $ 26,025       54     $ 32,544     $ 32,058  
Income producing commercial real estate     30       20,713       20,713       29       15,703       15,629  
Commercial & industrial     21       2,248       2,169       26       2,955       2,870  
Commercial construction     8       1,654       1,485       14       10,785       10,616  
Total commercial     115       51,130       50,392       123       61,987       61,173  
Residential mortgage     179       19,743       19,468       173       19,101       18,836  
Home equity lines of credit     2       101       101       2       167       167  
Residential construction     47       5,812       5,427       44       5,663       5,334  
Consumer installment     19       335       315       22       348       329  
Indirect auto     56       937       937       49       749       749  
Total loans     418     $ 78,058     $ 76,640       413     $ 88,015     $ 86,588  
Schedule of loans modified under the terms of TDR

 

    New TDRs for the Three Months Ended June 30,     New TDRs for the Six Months Ended June 30,  
                      Modified Within the                        Modified Within the   
                      Previous Twelve Months                       Previous Twelve Months  
          Pre-     Post-     That Have Subsequently           Pre-     Post-     That Have Subsequently  
          Modification     Modification     Defaulted during the           Modification     Modification     Defaulted during the  
        Outstanding     Outstanding     Three Months Ended June 30,         Outstanding     Outstanding     Six Months Ended June 30,  
2016   Number of
Contracts		     Recorded
Investment		     Recorded
Investment		     Number of
Contracts		     Recorded
Investment		     Number of
Contracts		     Recorded
Investment		     Recorded
Investment		     Number of
Contracts		     Recorded
Investment		  
                                                             
Owner occupied commercial real estate     3     $ 867     $ 867       1     $ 252       6     $ 1,516     $ 1,516       2     $ 499  
Income producing commercial real estate     -       -       -       -       -       -       -       -       -       -  
Commercial & industrial     2       749       749       -       -       3       946       946       -       -  
Commercial construction     -       -       -       -       -       -       -       -       -       -  
Total commercial     5       1,616       1,616       1       252       9       2,462       2,462       2       499  
Residential mortgage     11       1,803       1,801       1       85       18       2,602       2,564       1       85  
Home equity lines of credit     1       38       38       -       -       1       38       38       -       -  
Residential construction     5       429       373       -       -       6       495       439       -       -  
Consumer installment     -       -       -       -       -       1       20       20       -       -  
Indirect auto     10       235       235       -       -       18       474       474       -       -  
Total loans     32     $ 4,121     $ 4,063       2     $ 337       53     $ 6,091     $ 5,997       3     $ 584  

 

                      Modified Within the                        Modified Within the  
                      Previous Twelve Months                       Previous Twelve Months  
          Pre-     Post-     That Have Subsequently           Pre-     Post-     That Have Subsequently  
          Modification     Modification     Defaulted during the           Modification     Modification     Defaulted during the  
          Outstanding     Outstanding     Three Months Ended June 30,           Outstanding     Outstanding     Six Months Ended June 30,  
2015   Number of
Contracts		     Recorded
Investment		     Recorded
Investment		     Number of
Contracts		     Recorded
Investment		     Number of
Contracts		     Recorded
Investment		     Recorded
Investment		     Number of
Contracts		     Recorded
Investment		  
Owner occupied commercial real estate     6     $ 8,040     $ 7,996       -     $ -       8     $ 12,537     $ 12,493       -     $ -  
Income producing commercial real estate     1       55       54       -       -       3       310       310       -       -  
Commercial & industrial     4       992       992       -       -       6       1,180       1,180       -       -  
Commercial construction     1       233       233       -       -       1       233       233       -       -  
     Total commercial     12       9,320       9,275       -       -       18       14,260       14,216       -       -  
Residential mortgage     8       523       523       -       -       23       2,121       2,121       -       -  
Home equity lines of credit     1       83       74       -       -       1       83       74       -       -  
Residential construction     2       163       139       -       -       2       163       139       -       -  
Consumer installment     1       25       25       -       -       2       28       28       1       30  
Indirect auto     -       -       -       -       -       -       -       -       -       -  
   Total loans     24     $ 10,114     $ 10,036       -     $ -       46     $ 16,655     $ 16,578       1     $ 30  
Schedule of risk category of loans by class of loans
As of June 30, 2016   Pass     Watch (1)     Substandard     Doubtful / 
Loss		     Total  
                               
Owner occupied commercial real estate   $ 1,386,558     $ 19,766     $ 35,412     $ -     $ 1,441,736  
Income producing commercial real estate     872,759       5,027       19,777       -       897,563  
Commercial & industrial     911,815       3,209       9,404       -       924,428  
Commercial construction     375,061       2,043       1,506       -       378,610  
Total commercial     3,546,193       30,045       66,099       -       3,642,337  
Residential mortgage     986,571       7,652       38,033       -       1,032,256  
Home equity lines of credit     615,840       21       5,765       -       621,626  
Residential construction     335,266       6,355       8,778       -       350,399  
Consumer installment     123,248       -       811       -       124,059  
Indirect auto     472,792       -       2,324       -       475,116  
Total loans, excluding PCI loans   $ 6,079,910     $ 44,073     $ 121,810     $ -     $ 6,245,793  
                                         
Owner occupied commercial real estate   $ 1,399     $ 2,842     $ 4,098     $ -     $ 8,339  
Income producing commercial real estate     6,885       5,644       8,871       -       21,400  
Commercial & industrial     203       24       923       -       1,150  
Commercial construction     1,619       2,945       384       -       4,948  
Total commercial     10,106       11,455       14,276       -       35,837  
Residential mortgage     193       359       2,659       -       3,211  
Home equity lines of credit     205       -       973       -       1,178  
Residential construction     334       27       117       -       478  
Consumer installment     1       -       7       -       8  
Indirect auto     -       -       22       -       22  
Total PCI loans   $ 10,839     $ 11,841     $ 18,054     $ -     $ 40,734  
                                         
As of December 31, 2015                                        
                                         
Owner occupied commercial real estate   $ 1,414,353     $ 24,175     $ 41,764     $ -     $ 1,480,292  
Income producing commercial real estate     771,792       4,151       20,015       -       795,958  
Commercial & industrial     770,287       8,171       6,304       -       784,762  
Commercial construction     335,571       3,069       1,296       -       339,936  
Total commercial     3,292,003       39,566       69,379       -       3,400,948  
Residential mortgage     985,109       5,070       35,308       -       1,025,487  
Home equity lines of credit     589,749       24       6,345       -       596,118  
Residential construction     335,341       3,813       11,423       -       350,577  
Consumer installment     114,178       -       892       -       115,070  
Indirect auto     453,935       -       1,987       -       455,922  
Total loans, excluding PCI loans   $ 5,770,315     $ 48,473     $ 125,334     $ -     $ 5,944,122  
                                         
Owner occupied commercial real estate   $ 1,811     $ 6,705     $ 4,809     $ 349     $ 13,674  
Income producing commercial real estate     9,378       5,766       12,627       -       27,771  
Commercial & industrial     17       83       505       50       655  
Commercial construction     1,698       6       438       -       2,142  
Total commercial     12,904       12,560       18,379       399       44,242  
Residential mortgage     -       410       3,766       -       4,176  
Home equity lines of credit     214       -       1,474       -       1,688  
Residential construction     345       39       227       512       1,123  
Consumer installment     1       -       40       -       41  
Indirect auto     -       -       49       -       49  
Total PCI loans   $ 13,464     $ 13,009     $ 23,935     $ 911     $ 51,319  
(1) Residential mortgage loans and home equity loans reported in the watch column are generally commercial purpose loans secured by the borrower's residence.