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Loans Held for Investment and Allowance for Loan Losses - Summary of Impaired Loans Recorded Investment, Unpaid Principal Balance and Related Allowance (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With a Recorded Allowance $ 37,290 $ 31,207  
Recorded Investment, With No Recorded Allowance 4,545 4,311  
Recorded Investment, Total 41,835 35,518  
Loans, Unpaid Principal Balance 45,695 37,232  
Loans, Related Allowance Recorded 3,064 3,392  
Loans, Average Balance 40,338 34,134 $ 20,798
Loans, Interest Income Recognized 894 602 1,089
Commercial & Industrial      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With a Recorded Allowance 14,842 14,001  
Recorded Investment, With No Recorded Allowance 1,782 1,225  
Recorded Investment, Total 16,624 15,226  
Loans, Unpaid Principal Balance 18,566 16,002  
Loans, Related Allowance Recorded 1,372 1,726  
Loans, Average Balance 15,409 13,549 7,105
Loans, Interest Income Recognized 248 215 533
Commercial & Industrial | Death Care Management      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With a Recorded Allowance 0 8  
Recorded Investment, With No Recorded Allowance 7 103  
Recorded Investment, Total 7 111  
Loans, Unpaid Principal Balance 7 111  
Loans, Related Allowance Recorded 0 1  
Loans, Average Balance 8 112 0
Loans, Interest Income Recognized 0 1 0
Commercial & Industrial | Healthcare      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With a Recorded Allowance 3,521 7,259  
Recorded Investment, With No Recorded Allowance 1,030 664  
Recorded Investment, Total 4,551 7,923  
Loans, Unpaid Principal Balance 5,643 8,120  
Loans, Related Allowance Recorded 165 778  
Loans, Average Balance 6,101 7,513 3,375
Loans, Interest Income Recognized 53 81 276
Commercial & Industrial | Independent Pharmacies      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With a Recorded Allowance 8,154 3,184  
Recorded Investment, With No Recorded Allowance 417 330  
Recorded Investment, Total 8,571 3,514  
Loans, Unpaid Principal Balance 9,078 3,610  
Loans, Related Allowance Recorded 521 327  
Loans, Average Balance 6,018 2,570 1,701
Loans, Interest Income Recognized 100 76 148
Commercial & Industrial | Registered Investment Advisors      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With a Recorded Allowance 662 796  
Recorded Investment, With No Recorded Allowance 71 0  
Recorded Investment, Total 733 796  
Loans, Unpaid Principal Balance 725 792  
Loans, Related Allowance Recorded 504 514  
Loans, Average Balance 759 817 0
Loans, Interest Income Recognized 50 22 0
Commercial & Industrial | Veterinary Industry      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With a Recorded Allowance 2,505 2,754  
Recorded Investment, With No Recorded Allowance 257 128  
Recorded Investment, Total 2,762 2,882  
Loans, Unpaid Principal Balance 3,113 3,369  
Loans, Related Allowance Recorded 182 106  
Loans, Average Balance 2,523 2,537 2,029
Loans, Interest Income Recognized 45 35 109
Construction & Development      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With a Recorded Allowance 1,237 300  
Recorded Investment, With No Recorded Allowance 0 0  
Recorded Investment, Total 1,237 300  
Loans, Unpaid Principal Balance 1,258 311  
Loans, Related Allowance Recorded 157 13  
Loans, Average Balance 1,240 317 0
Loans, Interest Income Recognized 11 0 0
Construction & Development | Healthcare      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With a Recorded Allowance 1,237    
Recorded Investment, With No Recorded Allowance 0    
Recorded Investment, Total 1,237    
Loans, Unpaid Principal Balance 1,258    
Loans, Related Allowance Recorded 157    
Loans, Average Balance 1,240 0 0
Loans, Interest Income Recognized 11 0 0
Construction & Development | Agriculture      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With a Recorded Allowance   300  
Recorded Investment, With No Recorded Allowance   0  
Recorded Investment, Total   300  
Loans, Unpaid Principal Balance   311  
Loans, Related Allowance Recorded   13  
Loans, Average Balance 0 317 0
Loans, Interest Income Recognized 0 0 0
Commercial Real Estate      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With a Recorded Allowance 21,211 16,815  
Recorded Investment, With No Recorded Allowance 2,763 3,086  
Recorded Investment, Total 23,974 19,901  
Loans, Unpaid Principal Balance 25,813 20,758  
Loans, Related Allowance Recorded 1,535 1,638  
Loans, Average Balance 23,576 19,974 13,693
Loans, Interest Income Recognized 635 387 556
Commercial Real Estate | Death Care Management      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With a Recorded Allowance 2,221 1,580  
Recorded Investment, With No Recorded Allowance 610 188  
Recorded Investment, Total 2,831 1,768  
Loans, Unpaid Principal Balance 2,964 1,904  
Loans, Related Allowance Recorded 260 34  
Loans, Average Balance 2,882 1,789 1,420
Loans, Interest Income Recognized 50 7 0
Commercial Real Estate | Healthcare      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With a Recorded Allowance 3,717 3,514  
Recorded Investment, With No Recorded Allowance 598 530  
Recorded Investment, Total 4,315 4,044  
Loans, Unpaid Principal Balance 4,332 4,042  
Loans, Related Allowance Recorded 192 47  
Loans, Average Balance 4,381 4,093 1,403
Loans, Interest Income Recognized 49 41 0
Commercial Real Estate | Independent Pharmacies      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With a Recorded Allowance 1,562 528  
Recorded Investment, With No Recorded Allowance 0 0  
Recorded Investment, Total 1,562 528  
Loans, Unpaid Principal Balance 1,933 529  
Loans, Related Allowance Recorded 8 284  
Loans, Average Balance 1,708 538 0
Loans, Interest Income Recognized 0 3 0
Commercial Real Estate | Veterinary Industry      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With a Recorded Allowance 13,711 11,193  
Recorded Investment, With No Recorded Allowance 1,555 2,368  
Recorded Investment, Total 15,266 13,561  
Loans, Unpaid Principal Balance 16,584 14,283  
Loans, Related Allowance Recorded 1,075 1,273  
Loans, Average Balance 14,605 13,554 10,870
Loans, Interest Income Recognized 536 336 556
Commercial Real Estate | Other Industries      
Financing Receivable, Impaired [Line Items]      
Loans, Average Balance 0 0 0
Loans, Interest Income Recognized 0 0 0
Commercial Land      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With a Recorded Allowance 0 91  
Recorded Investment, With No Recorded Allowance 0 0  
Recorded Investment, Total 0 91  
Loans, Unpaid Principal Balance 58 161  
Loans, Related Allowance Recorded 0 15  
Loans, Average Balance 113 294 0
Loans, Interest Income Recognized 0 0 0
Commercial Land | Agriculture      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With a Recorded Allowance 0 91  
Recorded Investment, With No Recorded Allowance 0 0  
Recorded Investment, Total 0 91  
Loans, Unpaid Principal Balance 58 161  
Loans, Related Allowance Recorded 0 15  
Loans, Average Balance 113 294 0
Loans, Interest Income Recognized $ 0 $ 0 $ 0