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Credit Quality - Schedule of Impaired Loans Information by Class of Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2017
Construction & Land Development [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Loans, Recorded Investment, With no related allowance recorded $ 45,497       $ 52,279
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded 50,132       59,691
Impaired Loans, Recorded Investment, With an allowance recorded 2,001       1,383
Impaired Loans, Unpaid Principal Balance, With an allowance recorded 4,654       1,383
Impaired Loans, Related Allowance 277       229
Impaired Loans, Recorded Investment 47,498       53,662
Impaired Loans, Unpaid Principal Balance 54,786       61,074
Impaired Loans, Related Allowance 277       229
Impaired Loans, Average Recorded Investment, With no related allowance recorded 46,909 $ 36,182 $ 48,699 $ 35,903  
Impaired Loans, Interest Income Recognized, With no related allowance recorded 98 83 197 164  
Impaired Loans, Average Recorded Investment, With an allowance recorded 2,008 2,587 1,800 3,372  
Impaired Loans, Interest Income Recognized, With an allowance recorded 20 21 40 42  
Impaired Loans, Average Recorded Investment 48,917 38,769 50,499 39,275  
Impaired Loans, Interest Income Recognized 118 104 237 206  
Bankcard [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Loans, Average Recorded Investment, With no related allowance recorded 0 0 0 0  
Impaired Loans, Interest Income Recognized, With no related allowance recorded 0 0 0 0  
Other Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Loans, Average Recorded Investment, With no related allowance recorded 32 36 26 36  
Impaired Loans, Interest Income Recognized, With no related allowance recorded 0 0 0 0  
Commercial Real Estate [Member] | Owner-Occupied [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Loans, Recorded Investment, With no related allowance recorded 72,883       78,117
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded 73,343       78,419
Impaired Loans, Recorded Investment, With an allowance recorded 4,766       9,132
Impaired Loans, Unpaid Principal Balance, With an allowance recorded 4,766       9,132
Impaired Loans, Related Allowance 978       2,251
Impaired Loans, Recorded Investment 77,649       87,249
Impaired Loans, Unpaid Principal Balance 78,109       87,551
Impaired Loans, Related Allowance 978       2,251
Impaired Loans, Average Recorded Investment, With no related allowance recorded 74,330 69,670 75,592 62,615  
Impaired Loans, Interest Income Recognized, With no related allowance recorded 354 412 739 837  
Impaired Loans, Average Recorded Investment, With an allowance recorded 5,319 14,102 6,590 9,997  
Impaired Loans, Interest Income Recognized, With an allowance recorded 6 159 31 318  
Impaired Loans, Average Recorded Investment 79,649 83,772 82,182 72,612  
Impaired Loans, Interest Income Recognized 360 571 770 1,155  
Commercial Real Estate [Member] | Nonowner-Occupied [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Loans, Recorded Investment, With no related allowance recorded 99,098       134,136
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded 99,159       134,195
Impaired Loans, Recorded Investment, With an allowance recorded 10,463       7,797
Impaired Loans, Unpaid Principal Balance, With an allowance recorded 10,463       7,797
Impaired Loans, Related Allowance 1,693       1,592
Impaired Loans, Recorded Investment 109,561       141,933
Impaired Loans, Unpaid Principal Balance 109,622       141,992
Impaired Loans, Related Allowance 1,693       1,592
Impaired Loans, Average Recorded Investment, With no related allowance recorded 108,343 109,003 116,941 105,045  
Impaired Loans, Interest Income Recognized, With no related allowance recorded 159 168 328 347  
Impaired Loans, Average Recorded Investment, With an allowance recorded 9,503 14,147 8,934 15,411  
Impaired Loans, Interest Income Recognized, With an allowance recorded 60 12 119 87  
Impaired Loans, Average Recorded Investment 117,846 123,150 125,875 120,456  
Impaired Loans, Interest Income Recognized 219 180 447 434  
Other Commercial [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Loans, Recorded Investment, With no related allowance recorded 52,375       46,993
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded 61,377       49,552
Impaired Loans, Recorded Investment, With an allowance recorded 44,671       60,512
Impaired Loans, Unpaid Principal Balance, With an allowance recorded 50,278       70,396
Impaired Loans, Related Allowance 14,676       16,721
Impaired Loans, Recorded Investment 97,046       107,505
Impaired Loans, Unpaid Principal Balance 111,655       119,948
Impaired Loans, Related Allowance 14,676       16,721
Impaired Loans, Average Recorded Investment, With no related allowance recorded 52,384 58,597 50,587 53,076  
Impaired Loans, Interest Income Recognized, With no related allowance recorded 246 226 470 496  
Impaired Loans, Average Recorded Investment, With an allowance recorded 46,376 72,568 51,088 63,783  
Impaired Loans, Interest Income Recognized, With an allowance recorded 10 157 28 622  
Impaired Loans, Average Recorded Investment 98,760 131,165 101,675 116,859  
Impaired Loans, Interest Income Recognized 256 383 498 1,118  
Residential Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Loans, Recorded Investment, With no related allowance recorded 24,315       26,751
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded 25,078       28,202
Impaired Loans, Recorded Investment, With an allowance recorded 12,097       9,813
Impaired Loans, Unpaid Principal Balance, With an allowance recorded 13,539       10,418
Impaired Loans, Related Allowance 1,460       1,552
Impaired Loans, Recorded Investment 36,412       36,564
Impaired Loans, Unpaid Principal Balance 38,617       38,620
Impaired Loans, Related Allowance 1,460       1,552
Impaired Loans, Average Recorded Investment, With no related allowance recorded 24,220 20,713 25,064 21,468  
Impaired Loans, Interest Income Recognized, With no related allowance recorded 85 54 180 103  
Impaired Loans, Average Recorded Investment, With an allowance recorded 11,992 15,485 11,266 14,345  
Impaired Loans, Interest Income Recognized, With an allowance recorded 11 34 21 83  
Impaired Loans, Average Recorded Investment 36,212 36,198 36,330 35,813  
Impaired Loans, Interest Income Recognized 96 88 201 186  
Consumer [Member] | Bankcard [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Loans, Recorded Investment, With no related allowance recorded 0       0
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded 0       0
Impaired Loans, Recorded Investment, With an allowance recorded 0       0
Impaired Loans, Unpaid Principal Balance, With an allowance recorded 0       0
Impaired Loans, Related Allowance 0       0
Impaired Loans, Recorded Investment 0       0
Impaired Loans, Unpaid Principal Balance 0       0
Impaired Loans, Related Allowance 0       0
Impaired Loans, Average Recorded Investment, With an allowance recorded 0 0 0 0  
Impaired Loans, Interest Income Recognized, With an allowance recorded 0 0 0 0  
Impaired Loans, Average Recorded Investment 0 0 0 0  
Impaired Loans, Interest Income Recognized 0 0 0 0  
Consumer [Member] | Other Consumer [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired Loans, Recorded Investment, With no related allowance recorded 23       15
Impaired Loans, Unpaid Principal Balance, With no related allowance recorded 23       15
Impaired Loans, Recorded Investment, With an allowance recorded 0       0
Impaired Loans, Unpaid Principal Balance, With an allowance recorded 0       0
Impaired Loans, Related Allowance 0       0
Impaired Loans, Recorded Investment 23       15
Impaired Loans, Unpaid Principal Balance 23       15
Impaired Loans, Related Allowance 0       $ 0
Impaired Loans, Average Recorded Investment, With an allowance recorded 0 0 0 0  
Impaired Loans, Interest Income Recognized, With an allowance recorded 0 0 0 0  
Impaired Loans, Average Recorded Investment 32 36 26 36  
Impaired Loans, Interest Income Recognized $ 0 $ 0 $ 0 $ 0