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Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 40,815 | $ 38,271
Current Loans | 5,565,993 | 4,937,705
Total Loans | 5,606,808 | 4,975,976
Accruing Loans 90 Days or More Past Due | 11,215 | 1,916
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 7,119 | 5,967
Current Loans | 678,852 | 620,654
Total Loans | 685,971 | 626,621
Accruing Loans 90 Days or More Past Due | 3,808 |
Real Estate [Member] | Non-residential Real Estate Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,139 | 2,918
Current Loans | 1,189,409 | 1,143,210
Total Loans | 1,190,548 | 1,146,128
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,483 | 3,794
Current Loans | 334,943 | 324,908
Total Loans | 339,426 | 328,702
Accruing Loans 90 Days or More Past Due | 1,297 | 430
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 8,992 | 4,819
Current Loans | 882,771 | 822,685
Total Loans | 891,763 | 827,504
Accruing Loans 90 Days or More Past Due | 442 | 612
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,665 | 5,155
Current Loans | 1,419,409 | 1,278,499
Total Loans | 1,424,074 | 1,283,654
Accruing Loans 90 Days or More Past Due | 420 | 282
Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 3,172 | 3,115
Current Loans | 355,152 | 323,747
Total Loans | 358,324 | 326,862
Accruing Loans 90 Days or More Past Due | 376 | 325
Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 5,760 | 658
Current Loans | 149,582 | 141,251
Total Loans | 155,342 | 141,909
Accruing Loans 90 Days or More Past Due | 4,340 |
Acquired Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,606 | 11,845
Current Loans | 164,610 | 282,751
Total Loans | 169,216 | 294,596
Accruing Loans 90 Days or More Past Due | 532 | 267
Pegasus Bank [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 879 |
Current Loans | 391,265 |
Total Loans | 392,144 |
Pegasus Bank [Member] | Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Loans | 209,000 |
30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 12,164 | 23,235
30 to 59 Days Past Due [Member] | Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,325 | 5,114
30 to 59 Days Past Due [Member] | Real Estate [Member] | Non-residential Real Estate Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,066 | 2,772
30 to 59 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,387 | 2,448
30 to 59 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,633 | 1,728
30 to 59 Days Past Due [Member] | Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,642 | 3,620
30 to 59 Days Past Due [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,899 | 1,991
30 to 59 Days Past Due [Member] | Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 683 | 322
30 to 59 Days Past Due [Member] | Acquired Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,529 | 5,240
60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 6,731 | 4,881
60 to 89 Days Past Due [Member] | Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 935 | 810
60 to 89 Days Past Due [Member] | Real Estate [Member] | Non-residential Real Estate Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans |  | 32
60 to 89 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,166 | 653
60 to 89 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 665 | 292
60 to 89 Days Past Due [Member] | Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 665 | 702
60 to 89 Days Past Due [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 695 | 565
60 to 89 Days Past Due [Member] | Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 737 | 158
60 to 89 Days Past Due [Member] | Acquired Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 989 | 1,669
60 to 89 Days Past Due [Member] | Pegasus Bank [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 879 |
90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 21,920 | 10,155
90 Days and Greater [Member] | Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,859 | 43
90 Days and Greater [Member] | Real Estate [Member] | Non-residential Real Estate Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 73 | 114
90 Days and Greater [Member] | Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,930 | 693
90 Days and Greater [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 5,694 | 2,799
90 Days and Greater [Member] | Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,358 | 833
90 Days and Greater [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 578 | 559
90 Days and Greater [Member] | Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,340 | 178
90 Days and Greater [Member] | Acquired Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 2,088 | $ 4,936

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