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Non-performing Assets and Impaired Loans - Payment Status by Class of Loan (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 3,609,036 $ 2,991,236
Total Past Due 17,685 12,605
Loans Not Past Due 25,560 20,334
Total $ 3,634,596 $ 3,011,570
Total Past Due, Percentage of Total Loans 0.49% 0.42%
Loans Not Past Due, Percentage of Total Loans 0.70% 0.68%
Current,Percentage of total loans 99.30% 99.32%
Percentage of total loans 100.00% 100.00%
Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 2,039,953 $ 1,712,287
Total Past Due 5,863 6,586
Loans Not Past Due 7,693 10,265
Total 2,047,646 1,722,552
Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 515,604 439,542
Total Past Due 3,053 3,531
Loans Not Past Due 3,973 5,292
Total 519,577 444,834
Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 972,195 851,587
Total Past Due 1,056 1,046
Loans Not Past Due 1,136 1,268
Total 973,331 852,855
Commercial [Member] | Residential Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 12,925 4,703
Loans Not Past Due   492
Total 12,925 5,195
Commercial [Member] | Development & Spec Land [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 35,881 50,638
Total Past Due 73 68
Loans Not Past Due 73 68
Total 35,954 50,706
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 503,348 365,817
Total Past Due 1,681 1,941
Loans Not Past Due 2,511 3,145
Total 505,859 368,962
Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 910,691 737,608
Total Past Due 8,322 3,269
Loans Not Past Due 10,307 4,636
Total 920,998 742,244
Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 740,712 639,458
Total Past Due 8,322 3,269
Loans Not Past Due 10,307 4,636
Total 751,019 644,094
Real Estate [Member] | Residential Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 19,686 24,030
Total 19,686 24,030
Real Estate [Member] | Mortgage Warehousing [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 150,293 74,120
Total 150,293 74,120
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 658,392 541,341
Total Past Due 3,500 2,750
Loans Not Past Due 7,560 5,433
Total 665,952 546,774
Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 40,864 34,957
Total Past Due 30 35
Loans Not Past Due 215 146
Total 41,079 35,103
Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 344,478 311,494
Total Past Due 1,234 916
Loans Not Past Due 4,180 2,683
Total 348,658 314,177
Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 273,050 194,890
Total Past Due 2,236 1,799
Loans Not Past Due 3,165 2,604
Total 276,215 197,494
30 - 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 7,289 $ 5,100
Total Past Due, Percentage of Total Loans 0.20% 0.17%
30 - 59 Days Past Due [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 1,819 $ 1,719
30 - 59 Days Past Due [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 920 537
30 - 59 Days Past Due [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 80 203
30 - 59 Days Past Due [Member] | Commercial [Member] | Residential Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   492
30 - 59 Days Past Due [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 819 487
30 - 59 Days Past Due [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,984 1,131
30 - 59 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,984 1,131
30 - 59 Days Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 3,486 2,250
30 - 59 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 175 93
30 - 59 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,407 1,396
30 - 59 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 904 761
60 - 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 440 $ 2,061
Total Past Due, Percentage of Total Loans 0.01% 0.07%
60 - 89 Days Past Due [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 11 $ 1,752
60 - 89 Days Past Due [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   1,016
60 - 89 Days Past Due [Member] | Commercial [Member] | Non Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   19
60 - 89 Days Past Due [Member] | Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 11 717
60 - 89 Days Past Due [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   56
60 - 89 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   56
60 - 89 Days Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 429 253
60 - 89 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 5 18
60 - 89 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 404 198
60 - 89 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 20 37
Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 146 $ 568
Total Past Due, Percentage of Total Loans 0.00% 0.02%
Greater than 90 Days Past Due [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   $ 208
Greater than 90 Days Past Due [Member] | Commercial [Member] | Owner Occupied Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   208
Greater than 90 Days Past Due [Member] | Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 1 180
Greater than 90 Days Past Due [Member] | Real Estate [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1 180
Greater than 90 Days Past Due [Member] | Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 145 180
Greater than 90 Days Past Due [Member] | Consumer [Member] | Direct Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 5  
Greater than 90 Days Past Due [Member] | Consumer [Member] | Indirect Installment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 135 173
Greater than 90 Days Past Due [Member] | Consumer [Member] | Home Equity Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 5 $ 7