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Loans Receivable, Net - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment and Based on Impairment Method Excluding PCI Loans (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | $ 16,852 | $ 16,577 |  |
Initial allowance for credit losses on PCD loans | 2,639 |  |  |
Credit loss expense | 57,402 | 1,636 |  |
Charge-offs | (20,184) | (2,804) |  |
Recoveries | 1,325 | 1,443 |  |
Balance at end of period | 60,735 | 16,852 |  |
Ending allowance balance attributed to loans |  |  |  |
Individually evaluated for impairment |  |  |  | $ 476
Collectively evaluated for impairment |  |  |  | 16,376
Total ending allowance balance | 16,852 | 16,852 | $ 60,735 | 16,852
Loans |  |  |  |
Loans individually evaluated for impairment |  |  |  | 26,510
Loans collectively evaluated for impairment |  |  |  | 6,174,877
Total ending loan balance |  |  | 7,756,106 | 6,201,387
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 2,701 |  |  |
Balance at end of period |  | 2,701 |  |
Ending allowance balance attributed to loans |  |  |  |
Total ending allowance balance | 2,701 | 2,701 |  | 2,701
Commercial and industrial |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 1,458 | 1,609 |  |
Initial allowance for credit losses on PCD loans | 1,221 |  |  |
Credit loss expense | 1,039 | (311) |  |
Charge-offs | (890) | 0 |  |
Recoveries | 146 | 160 |  |
Balance at end of period | 5,390 | 1,458 |  |
Ending allowance balance attributed to loans |  |  |  |
Individually evaluated for impairment |  |  |  | 0
Collectively evaluated for impairment |  |  |  | 1,458
Total ending allowance balance | 5,390 | 1,609 | 5,390 | 1,458
Loans |  |  |  |
Loans individually evaluated for impairment |  |  |  | 243
Loans collectively evaluated for impairment |  |  |  | 395,848
Total ending loan balance |  |  | 470,656 | 396,091
Commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 2,416 |  |  |
Balance at end of period |  | 2,416 |  |
Ending allowance balance attributed to loans |  |  |  |
Total ending allowance balance | 2,416 | 2,416 |  | 2,416
Commercial real estate – owner occupied |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 2,893 | 2,277 |  |
Initial allowance for credit losses on PCD loans | 26 |  |  |
Credit loss expense | 15,007 | 947 |  |
Charge-offs | (1,769) | (663) |  |
Recoveries | 6 | 332 |  |
Balance at end of period | 15,054 | 2,893 |  |
Ending allowance balance attributed to loans |  |  |  |
Individually evaluated for impairment |  |  |  | 474
Collectively evaluated for impairment |  |  |  | 2,419
Total ending allowance balance | 2,893 | 2,893 | 15,054 | 2,893
Loans |  |  |  |
Loans individually evaluated for impairment |  |  |  | 6,163
Loans collectively evaluated for impairment |  |  |  | 785,778
Total ending loan balance |  |  | 1,145,065 | 791,941
Commercial real estate – owner occupied | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | (1,109) |  |  |
Balance at end of period |  | (1,109) |  |
Ending allowance balance attributed to loans |  |  |  |
Total ending allowance balance | (1,109) | (1,109) |  | (1,109)
Commercial Real Estate - Investor |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 9,883 | 8,770 |  |
Initial allowance for credit losses on PCD loans | 260 |  |  |
Credit loss expense | 34,935 | 638 |  |
Charge-offs | (13,081) | (236) |  |
Recoveries | 101 | 711 |  |
Balance at end of period | 26,703 | 9,883 |  |
Ending allowance balance attributed to loans |  |  |  |
Individually evaluated for impairment |  |  |  | 0
Collectively evaluated for impairment |  |  |  | 9,883
Total ending allowance balance | 9,883 | 9,883 | 26,703 | 9,883
Loans |  |  |  |
Loans individually evaluated for impairment |  |  |  | 5,584
Loans collectively evaluated for impairment |  |  |  | 2,279,114
Total ending loan balance |  |  | 3,491,464 | 2,284,698
Commercial Real Estate - Investor | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | (5,395) |  |  |
Balance at end of period |  | (5,395) |  |
Ending allowance balance attributed to loans |  |  |  |
Total ending allowance balance | (5,395) | (5,395) |  | (5,395)
Residential real estate |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 2,002 | 2,413 |  |
Initial allowance for credit losses on PCD loans | 109 |  |  |
Credit loss expense | 8,191 | 792 |  |
Charge-offs | (3,200) | (1,299) |  |
Recoveries | 883 | 96 |  |
Balance at end of period | 11,818 | 2,002 |  |
Ending allowance balance attributed to loans |  |  |  |
Individually evaluated for impairment |  |  |  | 0
Collectively evaluated for impairment |  |  |  | 2,002
Total ending allowance balance | 11,818 | 2,413 | 11,818 | 2,002
Loans |  |  |  |
Loans individually evaluated for impairment |  |  |  | 11,009
Loans collectively evaluated for impairment |  |  |  | 2,309,812
Total ending loan balance |  |  | 2,309,459 | 2,320,821
Residential real estate | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 3,833 |  |  |
Balance at end of period |  | 3,833 |  |
Ending allowance balance attributed to loans |  |  |  |
Total ending allowance balance | 3,833 | 3,833 |  | 3,833
Consumer |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 591 | 486 |  |
Initial allowance for credit losses on PCD loans | 1,023 |  |  |
Credit loss expense | (1,770) | 567 |  |
Charge-offs | (1,244) | (606) |  |
Recoveries | 189 | 144 |  |
Balance at end of period | 1,770 | 591 |  |
Ending allowance balance attributed to loans |  |  |  |
Individually evaluated for impairment |  |  |  | 2
Collectively evaluated for impairment |  |  |  | 589
Total ending allowance balance | 1,770 | 486 | 1,770 | 591
Loans |  |  |  |
Loans individually evaluated for impairment |  |  |  | 3,511
Loans collectively evaluated for impairment |  |  |  | 404,325
Total ending loan balance |  |  | 339,462 | 407,836
Consumer | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 2,981 |  |  |
Balance at end of period |  | 2,981 |  |
Ending allowance balance attributed to loans |  |  |  |
Total ending allowance balance | 2,981 | 2,981 |  | 2,981
Unallocated |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 25 | 1,022 |  |
Initial allowance for credit losses on PCD loans | 0 |  |  |
Credit loss expense | 0 | (997) |  |
Charge-offs | 0 | 0 |  |
Recoveries | 0 | 0 |  |
Balance at end of period | 0 | 25 |  |
Ending allowance balance attributed to loans |  |  |  |
Individually evaluated for impairment |  |  |  | 0
Collectively evaluated for impairment |  |  |  | 25
Total ending allowance balance | 25 | 25 | $ 0 | 25
Loans |  |  |  |
Loans individually evaluated for impairment |  |  |  | 0
Loans collectively evaluated for impairment |  |  |  | 0
Total ending loan balance |  |  |  | 0
Unallocated | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Balance at beginning of period | (25) |  |  |
Balance at end of period |  | (25) |  |
Ending allowance balance attributed to loans |  |  |  |
Total ending allowance balance | $ (25) | $ (25) |  | $ (25)

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- Definition Amount of increase in allowance for credit loss on financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually 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 (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 3: 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=121611835&loc=SL6953423-111524 + Details
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