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Loans Receivable, Net - Allowance for Loan Loses and Recorded Investment in Loans by Portfolio Segment and Based on Impairment Method Excluding PCI Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Balance at beginning of year | $ 15,721 | $ 15,183 | $ 16,722
Provision (benefit) charged to operations | 3,490 | 4,445 |
Charge-offs | (3,841) | (5,384) | (4,490)
Recoveries | 1,207 | 1,477 | 328
Balance at end of year | 16,577 | 15,721 | 15,183
Loans: |  |  |
Loans individually evaluated for impairment | 29,797 | 46,988 |
Loans collectively evaluated for impairment | 5,550,015 | 3,927,414 |
Total loans | 5,579,812 | 3,974,402 |
Ending allowance balance attributed to loans: |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 16,577 | 15,721 |
Total ending allowance balance | 16,577 | 15,721 |
Commercial and industrial |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Balance at beginning of year | 1,801 | 2,037 |
Provision (benefit) charged to operations | (66) | (379) |
Charge-offs | (230) | (380) |
Recoveries | 104 | 523 |
Balance at end of year | 1,609 | 1,801 | 2,037
Loans: |  |  |
Loans individually evaluated for impairment | 1,626 | 864 |
Loans collectively evaluated for impairment | 303,368 | 186,781 |
Total loans | 304,994 | 187,645 |
Ending allowance balance attributed to loans: |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 1,609 | 1,801 |
Total ending allowance balance | 1,609 | 1,801 |
Commercial real estate - owner occupied |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Balance at beginning of year | 3,175 | 2,999 |
Provision (benefit) charged to operations | (783) | 203 |
Charge-offs | (314) | (150) |
Recoveries | 199 | 123 |
Balance at end of year | 2,277 | 3,175 | 2,999
Loans: |  |  |
Loans individually evaluated for impairment | 5,395 | 15,132 |
Loans collectively evaluated for impairment | 734,980 | 554,365 |
Total loans | 740,375 | 569,497 |
Ending allowance balance attributed to loans: |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 2,277 | 3,175 |
Total ending allowance balance | 2,277 | 3,175 |
Commercial real estate – investor |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Balance at beginning of year | 7,952 | 6,361 |
Provision (benefit) charged to operations | 2,550 | 2,444 |
Charge-offs | (1,939) | (899) |
Recoveries | 207 | 46 |
Balance at end of year | 8,770 | 7,952 | 6,361
Loans: |  |  |
Loans individually evaluated for impairment | 9,738 | 17,923 |
Loans collectively evaluated for impairment | 2,005,472 | 1,168,379 |
Total loans | 2,015,210 | 1,186,302 |
Ending allowance balance attributed to loans: |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 8,770 | 7,952 |
Total ending allowance balance | 8,770 | 7,952 |
Residential mortgage |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Balance at beginning of year | 1,804 | 2,245 |
Provision (benefit) charged to operations | 1,056 | 2,742 |
Charge-offs | (1,021) | (3,820) |
Recoveries | 574 | 637 |
Balance at end of year | 2,413 | 1,804 | 2,245
Loans: |  |  |
Loans individually evaluated for impairment | 10,064 | 10,605 |
Loans collectively evaluated for impairment | 2,034,222 | 1,737,985 |
Total loans | 2,044,286 | 1,748,590 |
Ending allowance balance attributed to loans: |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 2,413 | 1,804 |
Total ending allowance balance | 2,413 | 1,804 |
Consumer |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Balance at beginning of year | 614 | 1,110 |
Provision (benefit) charged to operations | 86 | (509) |
Charge-offs | (337) | (135) |
Recoveries | 123 | 148 |
Balance at end of year | 486 | 614 | 1,110
Loans: |  |  |
Loans individually evaluated for impairment | 2,974 | 2,464 |
Loans collectively evaluated for impairment | 471,973 | 279,904 |
Total loans | 474,947 | 282,368 |
Ending allowance balance attributed to loans: |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 486 | 614 |
Total ending allowance balance | 486 | 614 |
Unallocated |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Balance at beginning of year | 375 | 431 |
Provision (benefit) charged to operations | 647 | (56) |
Charge-offs | 0 | 0 |
Recoveries | 0 | 0 |
Balance at end of year | 1,022 | 375 | $ 431
Loans: |  |  |
Loans individually evaluated for impairment | 0 | 0 |
Loans collectively evaluated for impairment | 0 | 0 |
Total loans | 0 | 0 |
Ending allowance balance attributed to loans: |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 1,022 | 375 |
Total ending allowance balance | $ 1,022 | $ 375 |

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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