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Segments - Financial Information of Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Interest income | $ 55,850 | $ 52,611 | $ 110,870 | $ 96,526
Interest expense | 6,142 | 3,800 | 11,524 | 7,456
NET INTEREST INCOME | 49,708 | 48,811 | 99,346 | 89,070
Provision for loan losses | 4,848 | 2,059 | 9,863 | 3,266
Noninterest income | 12,448 | 13,383 | 28,265 | 25,467
Noninterest expense | 33,105 | 33,634 | 69,861 | 65,877
Depreciation expense | 1,239 | 1,299 | 2,439 | 2,329
Amortization of intangible assets | 409 | 516 | 869 | 864
Provision for income taxes | 5,496 | 6,498 | 11,427 | 11,178
Net Income | 17,059 | 18,188 | 33,152 | 31,023
Operating Segments | Community Banking |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Interest income | 55,839 | 52,598 | 110,857 | 96,483
Interest expense | 6,213 | 4,056 | 11,651 | 7,944
NET INTEREST INCOME | 49,626 | 48,542 | 99,206 | 88,539
Provision for loan losses | 4,848 | 2,059 | 9,863 | 3,266
Noninterest income | 8,589 | 8,869 | 18,919 | 16,406
Noninterest expense | 29,462 | 29,916 | 61,610 | 58,603
Depreciation expense | 1,224 | 1,279 | 2,410 | 2,290
Amortization of intangible assets | 391 | 495 | 831 | 822
Provision for income taxes | 5,404 | 6,139 | 11,018 | 10,396
Net Income | 16,886 | 17,523 | 32,393 | 29,568
Operating Segments | Insurance |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Interest income | 1 | 1 | 1 | 1
NET INTEREST INCOME | 1 | 1 | 1 | 1
Noninterest income | 1,093 | 1,328 | 2,717 | 2,881
Noninterest expense | 1,103 | 1,053 | 2,358 | 2,190
Depreciation expense | 11 | 14 | 21 | 26
Amortization of intangible assets | 12 | 13 | 25 | 25
Provision for income taxes | (12) | 88 | 110 | 224
Net Income | (20) | 161 | 204 | 417
Operating Segments | Wealth Management |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Interest income | 117 | 157 | 245 | 298
NET INTEREST INCOME | 117 | 157 | 245 | 298
Noninterest income | 2,627 | 2,917 | 5,373 | 5,833
Noninterest expense | 2,437 | 2,285 | 4,743 | 4,505
Depreciation expense | 4 | 6 | 8 | 13
Amortization of intangible assets | 6 | 8 | 13 | 17
Provision for income taxes | 104 | 271 | 299 | 558
Net Income | 193 | 504 | 555 | 1,038
Eliminations |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Interest income | (107) | (145) | (233) | (256)
Interest expense | (71) | (256) | (127) | (488)
NET INTEREST INCOME | (36) | 111 | (106) | 232
Noninterest income | 139 | 269 | 1,256 | 347
Noninterest expense | $ 103 | $ 380 | $ 1,150 | $ 579

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