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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 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 34,645 | $ 21,528
Current Loans | 3,823,687 | 3,829,870
Total Loans | 3,858,332 | 3,851,398
Accruing Loans 90 Days or More Past Due | 1,311 | 1,135
30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 23,979 | 11,270
60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,499 | 3,964
90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 6,167 | 6,294
Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 394 | 904
Current Loans | 492,117 | 482,731
Total Loans | 492,511 | 483,635
Accruing Loans 90 Days or More Past Due | 159 | 70
Non-residential Real Estate Owner Occupied [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 235 | 635
Non-residential Real Estate Owner Occupied [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 159 | 269
Non-residential Real Estate Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,739 | 1,519
Current Loans | 961,559 | 952,484
Total Loans | 963,298 | 954,003
Non-residential Real Estate Other [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 914 | 377
Non-residential Real Estate Other [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans |  | 317
Non-residential Real Estate Other [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 825 | 825
Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,011 | 3,312
Current Loans | 320,538 | 304,267
Total Loans | 322,549 | 307,579
Accruing Loans 90 Days or More Past Due | 219 | 172
Residential Real Estate Permanent Mortgage [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 865 | 2,010
Residential Real Estate Permanent Mortgage [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 659 | 758
Residential Real Estate Permanent Mortgage [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 487 | 544
Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,309 | 3,502
Current Loans | 638,649 | 633,586
Total Loans | 642,958 | 637,088
Accruing Loans 90 Days or More Past Due | 326 | 387
Residential Real Estate All Other [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,954 | 1,820
Residential Real Estate All Other [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 233 | 194
Residential Real Estate All Other [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,122 | 1,488
Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 19,163 | 1,705
Current Loans | 919,622 | 965,002
Total Loans | 938,785 | 966,707
Accruing Loans 90 Days or More Past Due | 357 | 24
Non-consumer Non-real Estate [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 16,192 | 841
Non-consumer Non-real Estate [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,671 | 71
Non-consumer Non-real Estate [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,300 | 793
Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,413 | 2,955
Current Loans | 252,336 | 244,810
Total Loans | 254,749 | 247,765
Accruing Loans 90 Days or More Past Due | 213 | 215
Consumer Non-real Estate [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,403 | 1,914
Consumer Non-real Estate [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 693 | 711
Consumer Non-real Estate [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 317 | 330
Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,943 | 3,515
Current Loans | 155,372 | 149,469
Total Loans | 157,315 | 152,984
Other Loans [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 891 | 1,858
Other Loans [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 567 | 916
Other Loans [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 485 | 741
Acquired Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,673 | 4,116
Current Loans | 83,494 | 97,521
Total Loans | 86,167 | 101,637
Accruing Loans 90 Days or More Past Due | 37 | 267
Acquired Loans [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 525 | 1,815
Acquired Loans [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 676 | 997
Acquired Loans [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 1,472 | $ 1,304

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