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Mortgage Banking Activities (Tables)
 6 Months Ended
Jun. 30, 2023
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale [Table Text Block]
 June 30, 2023December 31, 2022
 Unpaid Principal Balance/
Notional		Fair ValueUnpaid Principal Balance/
Notional		Fair Value
Residential mortgage loans held for sale$93,379 $92,250 $74,941 $73,938 
Residential mortgage loan commitments55,031 1,829 45,492 1,054 
Forward sales contracts124,228 741 109,469 280 
  $94,820  $75,272 
Mortgage Banking Revenue [Table Text Block] Mortgage banking revenue was as follows (in thousands):
 Three Months Ended
June 30,		Six Months Ended
June 30,
 2023202220232022
Production revenue:  
Net realized gains (losses) on sale of mortgage loans$(296)$3,158 $(2,027)$10,041 
Net change in unrealized gain (loss) on mortgage loans held for sale(496)2,307 (126)(3,520)
Net change in the fair value of mortgage loan commitments(865)998 775 (2,300)
Net change in the fair value of forward sales contracts1,373 (6,967)461 330 
Total production revenue(284)(504)(917)4,551 
Servicing revenue15,425 11,872 30,425 23,467 
Total mortgage banking revenue$15,141 $11,368 $29,508 $28,018 
Summary of Mortgage Servicing Rights [Table Text Block]
The following represents a summary of mortgage servicing rights (dollars in thousands):
 June 30, 2023December 31, 2022
Number of residential mortgage loans serviced for others116,980 110,541 
Outstanding principal balance of residential mortgage loans serviced for others$20,693,294 $18,863,201 
Weighted average interest rate3.58 %3.59 %
Remaining term (in months)283283
Activity in Capitalized Mortgage Servicing Rights [Table Text Block] The following represents activity in capitalized mortgage servicing rights (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2023202220232022
Beginning Balance$299,803 $209,563 $277,608 $163,198 
Additions4,103 5,754 6,603 10,969 
Acquisitions— 44,867 31,138 44,867 
Change in fair value due to principal payments(8,445)(7,357)(13,829)(15,317)
Change in fair value due to market assumption changes9,261 17,485 3,202 66,595 
Ending Balance$304,722 $270,312 $304,722 $270,312 
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:
 June 30, 2023December 31, 2022
Discount rate – risk-free rate plus a market premium9.44%9.51%
Prepayment rate - based upon loan interest rate, original term and loan type7.27%7.54%
Loan servicing costs – annually per loan based upon loan type:
Performing loans
$69 - $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
4.18%4.06%
Primary/secondary mortgage rate spread
105 bps105 bps
Delinquency rate
1.91%2.33%