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
|