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Segments - Financial Information of Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Interest income | $ 52,611 | $ 39,872 | $ 96,526 | $ 78,537
Interest expense | 3,800 | 3,017 | 7,456 | 6,091
NET INTEREST INCOME | 48,811 | 36,855 | 89,070 | 72,446
Provision for loan losses | 2,059 | (1,134) | 3,266 | (845)
Noninterest income | 13,383 | 11,771 | 25,467 | 23,187
Noninterest Expense By Segment | 33,634 | 29,043 | 65,877 | 56,821
Depreciation expense | 1,299 | 825 | 2,329 | 1,645
Amortization of intangible assets | 516 | 297 | 864 | 613
Provision for income taxes | 6,498 | 4,875 | 11,178 | 8,646
Net Income | 18,188 | 14,720 | 31,023 | 28,753
Operating Segments [Member] | Community Banking [Member] |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Interest income | 52,598 | 39,845 | 96,483 | 78,475
Interest expense | 4,056 | 3,415 | 7,944 | 6,897
NET INTEREST INCOME | 48,542 | 36,430 | 88,539 | 71,578
Provision for loan losses | 2,059 | (1,134) | 3,266 | (845)
Noninterest income | 8,869 | 7,522 | 16,406 | 14,375
Noninterest Expense By Segment | 29,916 | 25,092 | 58,603 | 49,066
Depreciation expense | 1,279 | 805 | 2,290 | 1,607
Amortization of intangible assets | 495 | 274 | 822 | 566
Provision for income taxes | 6,139 | 4,637 | 10,396 | 8,002
Net Income | 17,523 | 14,278 | 29,568 | 27,557
Operating Segments [Member] | Insurance [Member] |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Interest income | 1 |  | 1 |
NET INTEREST INCOME | 1 |  | 1 |
Noninterest income | 1,328 | 1,245 | 2,881 | 2,766
Noninterest Expense By Segment | 1,053 | 1,044 | 2,190 | 2,199
Depreciation expense | 14 | 13 | 26 | 25
Amortization of intangible assets | 13 | 13 | 25 | 25
Provision for income taxes | 88 | 61 | 224 | 181
Net Income | 161 | 114 | 417 | 336
Operating Segments [Member] | Wealth Management [Member] |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Interest income | 157 | 136 | 298 | 310
NET INTEREST INCOME | 157 | 136 | 298 | 310
Noninterest income | 2,917 | 2,828 | 5,833 | 5,764
Noninterest Expense By Segment | 2,285 | 2,442 | 4,505 | 4,716
Depreciation expense | 6 | 7 | 13 | 13
Amortization of intangible assets | 8 | 10 | 17 | 22
Provision for income taxes | 271 | 177 | 558 | 463
Net Income | 504 | 328 | 1,038 | 860
Eliminations [Member] |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Interest income | (145) | (109) | (256) | (248)
Interest expense | (256) | (398) | (488) | (806)
NET INTEREST INCOME | 111 | 289 | 232 | 558
Noninterest income | 269 | 176 | 347 | 282
Noninterest Expense By Segment | $ 380 | $ 465 | $ 579 | $ 840

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