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Loans and Allowance for Loan Losses - Internal Loan Grading by Class of Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | $ 3,858,332 | $ 3,851,398
Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 492,511 | 483,635
Non-residential Real Estate Other [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 963,298 | 954,003
Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 322,549 | 307,579
Residential Real Estate All Other [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 642,958 | 637,088
Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 938,785 | 966,707
Consumer Non-real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 254,749 | 247,765
Other Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 157,315 | 152,984
Acquired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 86,167 | 101,637
Grade 1 [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 3,236,096 | 3,248,622
Grade 1 [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 407,818 | 402,706
Grade 1 [Member] | Non-residential Real Estate Other [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 809,293 | 795,209
Grade 1 [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 283,951 | 272,411
Grade 1 [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 529,071 | 529,555
Grade 1 [Member] | Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 773,811 | 821,094
Grade 1 [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 239,719 | 233,424
Grade 1 [Member] | Other Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 150,841 | 147,758
Grade 1 [Member] | Acquired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 41,592 | 46,465
Grade 2 [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 509,734 | 507,064
Grade 2 [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 78,987 | 75,555
Grade 2 [Member] | Non-residential Real Estate Other [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 119,551 | 133,542
Grade 2 [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 30,254 | 27,855
Grade 2 [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 101,307 | 99,214
Grade 2 [Member] | Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 133,243 | 117,457
Grade 2 [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 12,349 | 12,229
Grade 2 [Member] | Other Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 3,511 | 4,261
Grade 2 [Member] | Acquired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 30,532 | 36,951
Grade 3 [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 80,063 | 78,999
Grade 3 [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 5,455 | 5,008
Grade 3 [Member] | Non-residential Real Estate Other [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 29,517 | 20,126
Grade 3 [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 7,295 | 6,369
Grade 3 [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 10,608 | 6,146
Grade 3 [Member] | Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 13,080 | 26,550
Grade 3 [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 2,154 | 1,548
Grade 3 [Member] | Other Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 2,677 | 601
Grade 3 [Member] | Acquired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 9,277 | 12,651
Grade 4 [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 32,146 | 16,158
Grade 4 [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 251 | 366
Grade 4 [Member] | Non-residential Real Estate Other [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 4,937 | 5,126
Grade 4 [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 1,049 | 944
Grade 4 [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 1,972 | 2,173
Grade 4 [Member] | Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 18,651 | 1,606
Grade 4 [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 524 | 564
Grade 4 [Member] | Other Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 286 | 173
Grade 4 [Member] | Acquired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 4,476 | 5,206
Grade 5 [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 293 | 555
Grade 5 [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 3 |
Grade 5 [Member] | Other Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans |  | 191
Grade 5 [Member] | Acquired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | $ 290 | $ 364

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