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Mortgage Banking Activities, Mortgage Servicing Rights (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Summary of Mortgage Servicing Rights [Abstract] |  |  |
Number of residential mortgage loans serviced for others | 110,541 | 102,008 | 106,201
Outstanding principal balance of residential mortgage loans serviced for others | $ 18,863,201,000 | $ 16,442,446,000 | $ 16,228,449,000
Weighted average interest rate (in hundredths) | 3.59% | 3.58% | 3.84%
Remaining contractual term (in months) | 283 months | 281 months | 280 months
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Beginning balance | $ 163,198,000 | $ 101,172,000 | $ 201,886,000
Additions | 18,215,000 | 31,132,000 | 31,209,000
Disposals |  |  | (10,801,000)
Acquisitions | 47,675,000 | 28,018,000 |
Change in fair value due to loan runoff | (31,741,000) | (38,761,000) | (41,598,000)
Change in fair value due to market changes | 80,261,000 | 41,637,000 | (79,524,000)
Ending balance | $ 277,608,000 | $ 163,198,000 | $ 101,172,000
Servicing Assets at Fair Value, Assumptions Used to Estimate Fair Value [Abstract] |  |  |
Discount rate - risk-free rate plus a market premium (in hundredths) | 9.51% | 8.39% |
Prepayment rate - based upon loan interest rate, original term and loan type | 7.54% | 12.11% |
Loan servicing costs - annually per loan based upon loan type, performing, minimum (in dollars per loan) | $ 69 | $ 69 |
Loan servicing costs - annually per loan based upon loan type, performing, maximum (in dollars per loan) | 94 | 94 |
Loan servicing costs - annually per loan based upon loan type, delinquent, minimum (in dollars per loan) | 150 | 150 |
Loan servicing costs - annually per loan based upon loan type, delinquent, maximum (in dollars per loan) | 500 | 500 |
Loan servicing costs - annually per loan based upon loan type, foreclosure, minimum (in dollars per loan) | 875 | 1,000 |
Loan servicing costs - annually per loan based upon loan type, foreclosure, maximum (in dollars per loan) | $ 8,000 | $ 4,000 |
Primary secondary mortgage rate spread (in basis points) | 105 | 105 |
Escrow earnings rate - indexed to rates paid on deposit accounts with comparable average life | 4.06% | 1.32% |
Delinquency rate | 2.33% | 2.05% |

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- Definition Indicates the number of mortgage loans being serviced. + References No definition available. + Details
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- Definition The value of new servicing assets, subsequently measured at fair value, acquired during the current period through purchases of financial assets. + References No definition available. + Details
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- Definition Servicing Assets at Fair Value Assumptions Used to Estimate Fair Value Delinquent Loan Service Cost Minimum + References No definition available. + Details
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- Definition The escrow earning rate used to estimate the fair value of servicing assets, based on rates paid on deposit accounts. + References No definition available. + Details
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- Definition Servicing Assets At Fair Value Assumptions Used to Estimate Fair Value Foreclosure Loan Service Cost Maximum + References No definition available. + Details
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- Definition The maximum cost to service a performing loan for the period used as a variable in estimating fair value. + References No definition available. + Details
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- Definition Amount of increase (decrease) in fair value from changes in the assumptions or model used to calculate the fair value of a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References No definition available. + Details
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- Definition The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122625-111746 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122625-111746 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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