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Loan Servicing Rights - Components of Loan Servicing Rights and Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Servicing Assets at Fair Value [Line Items] |  |  |
Additions | $ 3,657 | $ 13,080 | $ 11,759
Servicing asset: |  |  |
Balance at beginning of period | 37,267 | 30,085 | 28,124
Additions | 3,657 | 13,080 | 11,759
Amortization | (5,135) | (5,898) | (9,798)
Balance before valuation allowance at end of period | 35,789 | 37,267 | 30,085
Valuation allowance: |  |  |
Balance at beginning of period | 0 | (46) | (1,407)
(Additions)/recoveries | 0 | 46 | 1,361
Balance at end of period | 0 | 0 | (46)
Loan servicing rights, net | $ 35,789 | 37,267 | $ 30,039
First Midwest |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Additions |  | 7,700 |
Servicing asset: |  |  |
Additions |  | $ 7,700 |

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- Definition Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481260/860-50-45-2 + Details
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- Definition Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481260/860-50-45-1 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481260/860-50-45-2 + Details
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- Definition Amount of additions from purchases, assumption or transfer to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481229/860-50-50-4 + Details
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