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Mortgage Banking Activities (Tables)
 3 Months Ended
Mar. 31, 2023
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale [Table Text Block]
 March 31, 2023December 31, 2022
 Unpaid Principal Balance/
Notional		Fair ValueUnpaid Principal Balance/
Notional		Fair Value
Residential mortgage loans held for sale$72,746 $72,113 $74,941 $73,938 
Residential mortgage loan commitments71,693 2,694 45,492 1,054 
Forward sales contracts127,427 (632)109,469 280 
  $74,175  $75,272 
Mortgage Banking Revenue [Table Text Block] Mortgage banking revenue was as follows (in thousands):
 Three Months Ended
March 31,
 20232022
Production revenue:  
Net realized gains (losses) on sale of mortgage loans$(1,731)$6,883 
Net change in unrealized gain (loss) on mortgage loans held for sale370 (5,827)
Net change in the fair value of mortgage loan commitments1,640 (3,298)
Net change in the fair value of forward sales contracts(912)7,297 
Total production revenue(633)5,055 
Servicing revenue15,000 11,595 
Total mortgage banking revenue$14,367 $16,650 
Summary of Mortgage Servicing Rights [Table Text Block]
The following represents a summary of mortgage servicing rights (dollars in thousands):
 March 31, 2023December 31, 2022
Number of residential mortgage loans serviced for others118,303 110,541 
Outstanding principal balance of residential mortgage loans serviced for others$21,009,762 $18,863,201 
Weighted average interest rate3.55 %3.59 %
Remaining term (in months)285283
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,
20232022
Beginning Balance$277,608 $163,198 
Additions2,500 5,215 
Acquisitions31,138 — 
Change in fair value due to principal payments(5,384)(7,960)
Change in fair value due to market assumption changes(6,059)49,110 
Ending Balance$299,803 $209,563 
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, 2023December 31, 2022
Discount rate – risk-free rate plus a market premium8.95%9.51%
Prepayment rate - based upon loan interest rate, original term and loan type7.43%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
3.66%4.06%
Primary/secondary mortgage rate spread
105 bps105 bps
Delinquency rate
1.40%2.33%