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Mortgage Banking Activities (Tables)
 3 Months Ended
Mar. 31, 2024
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale [Table Text Block]
 March 31, 2024December 31, 2023
 Unpaid Principal Balance/
Notional		Fair ValueUnpaid Principal Balance/
Notional		Fair Value
Residential mortgage loans held for sale$73,937 $73,090 $56,922 $56,457 
Residential mortgage loan commitments67,951 2,473 34,783 1,379 
Forward sales contracts108,070 (114)75,448 (901)
  $75,449  $56,935 
Mortgage Banking Revenue [Table Text Block]
Mortgage banking revenue was as follows (in thousands):
 Three Months Ended
March 31,
 20242023
Production revenue:  
Net realized gains (losses) on sale of mortgage loans$2,026 $(1,731)
Net change in unrealized gain (loss) on mortgage loans held for sale
(382)370 
Net change in the fair value of mortgage loan commitments1,094 1,640 
Net change in the fair value of forward sales contracts787 (912)
Total production revenue (loss)3,525 (633)
Servicing revenue15,442 15,000 
Total mortgage banking revenue$18,967 $14,367 
Summary of Mortgage Servicing Rights [Table Text Block]
The following represents a summary of mortgage servicing rights (dollars in thousands):
 March 31, 2024December 31, 2023
Number of residential mortgage loans serviced for others122,276 115,967 
Outstanding principal balance of residential mortgage loans serviced for others$21,432,048 $20,382,192 
Weighted average interest rate3.66 %3.64 %
Remaining term (in months)278280
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]
The following represents activity in capitalized mortgage servicing rights (in thousands):
Three Months Ended March 31,
20242023
Beginning Balance$293,884 $277,608 
Additions2,516 2,500 
Acquisitions17,400 31,138 
Change in fair value due to principal payments(5,447)(5,384)
Change in fair value due to market assumption changes10,977 (6,059)
Ending Balance$319,330 $299,803 
Assumptions to Value Mortgage Servicing Rights [Table Text Block]
Mortgage servicing rights are not traded in active markets. Fair value is determined by discounting the projected net cash flows. Significant market assumptions used to determine fair value based on significant unobservable inputs were as follows:
 March 31, 2024December 31, 2023
Discount rate – risk-free rate plus a market premium9.82%9.72%
Prepayment rate - based upon loan interest rate, original term and loan type6.83%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 - $8,000
$875 - $8,000
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
4.27%3.90%
Primary/secondary mortgage rate spread
115 bps105 bps
Delinquency rate
2.06%2.06%