Loans - Summary of Loan Balances (Detail) - USD ($) $ in Thousands |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Commercial |
$ 3,169,675
|
|
$ 3,038,472
|
|
|
|
Unamortized net deferred loan fees |
(9,756)
|
|
(8,651)
|
|
|
|
Discounts to principal balance of loans owed, net of charge-offs |
(13,606)
|
|
(14,656)
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
3,146,313
|
|
3,015,165
|
$ 2,826,393
|
|
|
Allowance for loan losses |
(29,524)
|
$ (29,973)
|
(30,323)
|
(28,143)
|
$ (31,017)
|
$ (32,503)
|
Mortgage Loans on Real Estate [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
2,401,040
|
|
2,300,322
|
2,106,567
|
|
|
Allowance for loan losses |
(13,598)
|
(13,665)
|
(13,758)
|
(12,613)
|
(14,204)
|
(14,265)
|
Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
350,925
|
|
356,874
|
360,782
|
|
|
Allowance for loan losses |
(7,137)
|
(7,718)
|
(8,227)
|
(9,157)
|
(9,576)
|
(10,310)
|
Commercial Portfolio Segment [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
237,619
|
|
220,412
|
225,743
|
|
|
Allowance for loan losses |
(6,378)
|
(6,392)
|
(6,512)
|
(4,729)
|
(5,326)
|
(5,831)
|
Construction [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
156,729
|
|
137,557
|
133,301
|
|
|
Allowance for loan losses |
(2,411)
|
(2,198)
|
(1,826)
|
(1,644)
|
(1,911)
|
(2,097)
|
Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
384,692
|
|
385,426
|
381,305
|
|
|
Allowance for loan losses |
(1,991)
|
(2,170)
|
(2,317)
|
(2,511)
|
(2,662)
|
(2,748)
|
Home Equity Loans [Member] | Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
40,986
|
|
43,031
|
45,936
|
|
|
Allowance for loan losses |
(1,532)
|
(1,736)
|
(1,841)
|
(2,356)
|
(2,451)
|
(2,644)
|
Other Consumer [Member] | Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
23,503
|
|
25,155
|
28,370
|
|
|
Allowance for loan losses |
(557)
|
(570)
|
(586)
|
(645)
|
(595)
|
(622)
|
Commercial [Member] | Mortgage Loans on Real Estate [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
2,016,348
|
|
1,914,896
|
1,725,262
|
|
|
Allowance for loan losses |
(11,607)
|
(11,495)
|
(11,441)
|
(10,102)
|
(11,542)
|
(11,517)
|
Commercial [Member] | Construction [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
83,151
|
|
69,627
|
70,151
|
|
|
Allowance for loan losses |
(977)
|
(847)
|
(642)
|
(466)
|
(572)
|
(680)
|
Home Equity Lines of Credit [Member] | Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
286,436
|
|
288,688
|
286,476
|
|
|
Allowance for loan losses |
(5,048)
|
(5,412)
|
(5,800)
|
(6,156)
|
(6,530)
|
(7,044)
|
Residential [Member] | Construction [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
73,578
|
|
67,930
|
63,150
|
|
|
Allowance for loan losses |
(1,434)
|
$ (1,351)
|
(1,184)
|
$ (1,178)
|
$ (1,339)
|
$ (1,417)
|
Originated [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Commercial |
2,855,594
|
|
2,699,053
|
|
|
|
Unamortized net deferred loan fees |
(9,756)
|
|
(8,651)
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
2,845,838
|
|
2,690,402
|
|
|
|
Allowance for loan losses |
(28,761)
|
|
(29,122)
|
|
|
|
Originated [Member] | Mortgage Loans on Real Estate [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
2,131,979
|
|
2,011,032
|
|
|
|
Originated [Member] | Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
329,786
|
|
332,649
|
|
|
|
Originated [Member] | Commercial Portfolio Segment [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
227,591
|
|
209,437
|
|
|
|
Originated [Member] | Construction [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
156,482
|
|
137,284
|
|
|
|
Originated [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
326,149
|
|
320,522
|
|
|
|
Originated [Member] | Home Equity Loans [Member] | Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
38,082
|
|
39,848
|
|
|
|
Originated [Member] | Other Consumer [Member] | Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
21,421
|
|
22,859
|
|
|
|
Originated [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
1,805,830
|
|
1,690,510
|
|
|
|
Originated [Member] | Commercial [Member] | Construction [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
82,912
|
|
69,364
|
|
|
|
Originated [Member] | Home Equity Lines of Credit [Member] | Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
270,283
|
|
269,942
|
|
|
|
Originated [Member] | Residential [Member] | Construction [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
73,570
|
|
67,920
|
|
|
|
PNCI [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Commercial |
293,151
|
|
316,238
|
|
|
|
Discounts to principal balance of loans owed, net of charge-offs |
(6,537)
|
|
(7,035)
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
286,614
|
|
309,203
|
|
|
|
Allowance for loan losses |
(624)
|
|
(929)
|
|
|
|
PNCI [Member] | Mortgage Loans on Real Estate [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
259,746
|
|
279,342
|
|
|
|
PNCI [Member] | Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
19,066
|
|
21,197
|
|
|
|
PNCI [Member] | Commercial Portfolio Segment [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
7,555
|
|
8,391
|
|
|
|
PNCI [Member] | Construction [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
247
|
|
273
|
|
|
|
PNCI [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
56,823
|
|
63,519
|
|
|
|
PNCI [Member] | Home Equity Loans [Member] | Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
2,449
|
|
2,698
|
|
|
|
PNCI [Member] | Other Consumer [Member] | Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
2,039
|
|
2,251
|
|
|
|
PNCI [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
202,923
|
|
215,823
|
|
|
|
PNCI [Member] | Commercial [Member] | Construction [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
239
|
|
263
|
|
|
|
PNCI [Member] | Home Equity Lines of Credit [Member] | Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
14,578
|
|
16,248
|
|
|
|
PNCI [Member] | Residential [Member] | Construction [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
8
|
|
10
|
|
|
|
PCI - Cash Basis [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Commercial |
4,898
|
|
5,863
|
|
|
|
Discounts to principal balance of loans owed, net of charge-offs |
(3,368)
|
|
(3,794)
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
1,530
|
|
2,069
|
|
|
|
Allowance for loan losses |
(7)
|
|
(17)
|
|
|
|
PCI - Cash Basis [Member] | Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
1,530
|
|
2,069
|
|
|
|
PCI - Cash Basis [Member] | Home Equity Lines of Credit [Member] | Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
1,530
|
|
2,069
|
|
|
|
PCI - Other [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Commercial |
16,032
|
|
17,318
|
|
|
|
Discounts to principal balance of loans owed, net of charge-offs |
(3,701)
|
|
(3,827)
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
12,331
|
|
13,491
|
|
|
|
Allowance for loan losses |
(132)
|
|
(255)
|
|
|
|
PCI - Other [Member] | Mortgage Loans on Real Estate [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
9,315
|
|
9,948
|
|
|
|
PCI - Other [Member] | Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
543
|
|
959
|
|
|
|
PCI - Other [Member] | Commercial Portfolio Segment [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
2,473
|
|
2,584
|
|
|
|
PCI - Other [Member] | Residential 1-4 Family [Member] | Mortgage Loans on Real Estate [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
1,720
|
|
1,385
|
|
|
|
PCI - Other [Member] | Home Equity Loans [Member] | Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
455
|
|
485
|
|
|
|
PCI - Other [Member] | Other Consumer [Member] | Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
43
|
|
45
|
|
|
|
PCI - Other [Member] | Commercial [Member] | Mortgage Loans on Real Estate [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
7,595
|
|
8,563
|
|
|
|
PCI - Other [Member] | Home Equity Lines of Credit [Member] | Consumer [Member] |
|
|
|
|
|
|
Loans and Leases Receivable Disclosure [Line Items] |
|
|
|
|
|
|
Total loans, net of unamortized deferred loan fees and discounts |
$ 45
|
|
$ 429
|
|
|
|