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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