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Loans and Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans | $ 23,058,461 |  | $ 23,058,461 |  | $ 22,424,501
Percentage of loan portfolio as commercial loan | 76.20% |  | 76.20% |  |
Risk rated loans | $ 1,000 |  | $ 1,000 |  |
Percentage of credit exposure to risk based capital | 25.00% |  | 25.00% |  |
Loans and other extensions of credit granted to directors, executive officers, and their related entities | $ 9,500 |  | $ 9,500 |  | 10,700
Amount drawn from loans and other extensions of credit granted | 6,000 |  | 6,000 |  | 6,800
Commercial loans held-for-sale | 49,121 |  | 49,121 |  | 31,200
Mortgage loans held-for-sale | 42,000 |  | 42,000 |  | 67,800
Loans sold |  |  | 1,300,000 | $ 1,300,000 |
Gain (Loss) on Sale of Mortgage Loans | 7,800 | $ 19,500 | 28,180 | $ 47,655 |
Paycheck Protection Program [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans | $ 708,700 |  | $ 708,700 |  | $ 1,800,000
Construction and land development |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percentage of credit exposure to risk based capital | 89.30% |  | 89.30% |  | 89.00%
Non-owner occupied commercial real estate and multifamily loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percentage of credit exposure to risk based capital | 252.40% |  | 252.40% |  | 264.00%

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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123605502&loc=d3e21310-158488 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123605502&loc=d3e21286-158488 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123605549&loc=d3e21493-158490 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 + Details
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