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Mortgage Banking Activities (Tables)
 12 Months Ended
Dec. 31, 2024
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale [Table Text Block]
The unpaid principal balance of residential mortgage loans held for sale, notional amounts of derivative contracts related to residential mortgage loan commitments, and forward contract sales with their related fair values included in Mortgage loans held for sale on the Consolidated Balance Sheets were (in thousands):
 December 31, 2024December 31, 2023
 Unpaid Principal Balance/
Notional		Fair ValueUnpaid Principal Balance/
Notional		Fair Value
Residential mortgage loans held for sale$77,080 $75,969 $56,922 $56,457 
Residential mortgage loan commitments36,590 1,119 34,783 1,379 
Forward sales contracts82,000 473 75,448 (901)
  $77,561  $56,935 

No residential mortgage loans held for sale were 90 days or more past due or considered impaired as of December 31, 2024 or December 31, 2023. No credit losses were recognized on residential mortgage loans held for sale for the years ended December 31, 2024, 2023 and 2022.
Mortgage Banking Revenue [Table Text Block]
Mortgage banking revenue was as follows (in thousands):
 Year Ended
 202420232022
Production revenue:  
Net realized gain (loss) on sales of mortgage loans$8,271 $(5,021)$7,416 
Net change in unrealized gain (loss) on mortgage loans held for sale(646)538 (4,468)
Net change in the fair value of mortgage loan commitments(260)325 (5,113)
Net change in the fair value of forward sales contracts1,374 (1,181)327 
Total mortgage production revenue8,739 (5,339)(1,838)
Servicing revenue65,368 61,037 51,203 
Total mortgage banking revenue$74,107 $55,698 $49,365 
Summary of Mortgage Servicing Rights [Table Text Block]
The following represents a summary of mortgage servicing rights (dollars in thousands):
December 31,
 202420232022
Number of residential mortgage loans serviced for others125,728 115,967 110,541 
Outstanding principal balance of residential mortgage loans serviced for others$22,269,513 $20,382,192 $18,863,201 
Weighted average interest rate3.73 %3.64 %3.59 %
Remaining contractual term (in months)276280283
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]
Activity in capitalized mortgage servicing rights during the three years ended December 31, 2024 is as follows (in thousands):
Balance, December 31, 2021$163,198 
Additions18,215 
Acquisitions47,675 
Change in fair value due to principal payments(31,741)
Change in fair value due to market assumption changes80,261 
Balance, December 31, 2022277,608 
Additions12,142 
Acquisitions34,593 
Change in fair value due to principal payments(27,344)
Change in fair value due to market assumption changes(3,115)
Balance, December 31, 2023293,884 
Additions14,976 
Acquisitions41,655 
Change in fair value due to principal payments(30,807)
Change in fair value due to market assumption changes18,437 
Balance, December 31, 2024$338,145 
Assumptions to Value Mortgage Servicing Rights [Table Text Block] Significant assumptions used to determine fair value considered to be significant unobservable inputs were as follows:
December 31,
 20242023
Discount rate – risk-free rate plus a market premium9.60%9.72%
Prepayment rate - based upon loan interest rate, original term, and loan type7.09%7.34%
Loan servicing costs – annually per loan based upon loan type:
Performing loans
$73 - $94
$69 - $94
Delinquent loans
$150 - $500
$150 - $500
Loans in foreclosure
$875 - $6,000
$875 - $8,000
Primary/secondary mortgage rate spread
115 bps105 bps
Escrow earnings rate – indexed to rates paid on deposit accounts with a comparable average life4.44%3.90%
Delinquency rate
2.19%2.06%