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Loans and Allowance - Allowance for Credit Losses and Loan Portfolio by Loan Segment (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance balances - Individually evaluated for impairment | $ 12,901 | $ 689 |  |
Allowance balances - Collectively evaluated for impairment | 117,747 | 79,595 |  |
Total allowance for loan losses | 130,648 | 80,284 | $ 80,552 | $ 75,032
Loan balances - Individually evaluated for impairment | 56,156 | 11,709 |  |
Loan balances - Collectively evaluated for impairment | 9,180,857 | 8,434,292 |  |
Loans | 9,243,174 | 8,459,310 |  |
Loans acquired with deteriorated credit quality |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans | 6,161 | 13,309 |  |
Commercial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance balances - Individually evaluated for impairment | 223 | 0 |  |
Allowance balances - Collectively evaluated for impairment | 46,892 | 32,902 |  |
Total allowance for loan losses | 47,115 | 32,902 | 32,657 | 30,420
Loan balances - Individually evaluated for impairment | 1,258 | 457 |  |
Loan balances - Collectively evaluated for impairment | 3,505,863 | 2,748,681 |  |
Loans | 3,507,698 | 2,750,854 |  |
Commercial | Loans acquired with deteriorated credit quality |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans | 577 | 1,716 |  |
Commercial Real Estate |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance balances - Individually evaluated for impairment | 12,246 | 231 |  |
Allowance balances - Collectively evaluated for impairment | 38,824 | 28,547 |  |
Total allowance for loan losses | 51,070 | 28,778 | 29,609 | 27,343
Loan balances - Individually evaluated for impairment | 51,605 | 8,728 |  |
Loan balances - Collectively evaluated for impairment | 3,805,808 | 3,821,660 |  |
Loans | 3,862,997 | 3,840,266 |  |
Commercial Real Estate | Loans acquired with deteriorated credit quality |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans | 5,584 | 9,878 |  |
Construction |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance balances - Individually evaluated for impairment | 0 | 0 |  |
Allowance balances - Collectively evaluated for impairment | 9,648 | 4,035 |  |
Total allowance for loan losses | 9,648 | 4,035 | 3,964 | 3,732
Loan balances - Individually evaluated for impairment | 2 | 4 |  |
Loan balances - Collectively evaluated for impairment | 129,477 | 135,985 |  |
Loans | 129,479 | 135,989 |  |
Construction | Loans acquired with deteriorated credit quality |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans | 0 | 0 |  |
Residential |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance balances - Individually evaluated for impairment | 432 | 458 |  |
Allowance balances - Collectively evaluated for impairment | 22,383 | 14,111 |  |
Total allowance for loan losses | 22,815 | 14,569 | $ 14,322 | $ 13,537
Loan balances - Individually evaluated for impairment | 3,291 | 2,520 |  |
Loan balances - Collectively evaluated for impairment | 1,739,709 | 1,727,966 |  |
Loans | 1,743,000 | 1,732,201 |  |
Residential | Loans acquired with deteriorated credit quality |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans | $ 0 | $ 1,715 |  |

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible 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 (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + 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 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 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: 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=121614798&loc=d3e15032-111544 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)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 4: 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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