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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, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 23,782 | $ 21,528
Current Loans | 3,935,887 | 3,829,870
Total Loans | 3,959,669 | 3,851,398
Accruing Loans 90 Days or More Past Due | 2,061 | 1,135
30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 10,340 | 11,270
60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 3,156 | 3,964
90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 10,286 | 6,294
Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 713 | 904
Current Loans | 492,565 | 482,731
Total Loans | 493,278 | 483,635
Accruing Loans 90 Days or More Past Due | 99 | 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 | 223 | 635
Non-residential Real Estate Owner Occupied [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 391 |
Non-residential Real Estate Owner Occupied [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 99 | 269
Non-residential Real Estate Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 3,258 | 1,519
Current Loans | 1,033,981 | 952,484
Total Loans | 1,037,239 | 954,003
Accruing Loans 90 Days or More Past Due | 317 |
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 | 2,035 | 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 | 61 | 317
Non-residential Real Estate Other [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,162 | 825
Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,464 | 3,312
Current Loans | 322,673 | 304,267
Total Loans | 325,137 | 307,579
Accruing Loans 90 Days or More Past Due | 788 | 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 | 1,108 | 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 | 328 | 758
Residential Real Estate Permanent Mortgage [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,028 | 544
Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,335 | 3,502
Current Loans | 660,700 | 633,586
Total Loans | 663,035 | 637,088
Accruing Loans 90 Days or More Past Due | 420 | 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 | 1,279 | 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 | 89 | 194
Residential Real Estate All Other [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 967 | 1,488
Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 3,848 | 1,705
Current Loans | 930,554 | 965,002
Total Loans | 934,402 | 966,707
Accruing Loans 90 Days or More Past Due | 22 | 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 | 2,690 | 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 | 949 | 71
Non-consumer Non-real Estate [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 209 | 793
Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,613 | 2,955
Current Loans | 265,755 | 244,810
Total Loans | 268,368 | 247,765
Accruing Loans 90 Days or More Past Due | 264 | 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 | 1,700 | 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 | 616 | 711
Consumer Non-real Estate [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 297 | 330
Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 5,947 | 3,515
Current Loans | 155,379 | 149,469
Total Loans | 161,326 | 152,984
Accruing Loans 90 Days or More Past Due | 65 |
Other Loans [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 562 | 1,858
Other Loans [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 174 | 916
Other Loans [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 5,211 | 741
Acquired Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,604 | 4,116
Current Loans | 74,280 | 97,521
Total Loans | 76,884 | 101,637
Accruing Loans 90 Days or More Past Due | 86 | 267
Acquired Loans [Member] | 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 743 | 1,815
Acquired Loans [Member] | 60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 548 | 997
Acquired Loans [Member] | 90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 1,313 | $ 1,304

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