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Mortgage Banking Activities (Tables)
 3 Months Ended
Mar. 31, 2022
Mortgage Banking [Abstract]  
Components of Residential Mortgage Loans Held For Sale [Table Text Block]
 March 31, 2022December 31, 2021
 Unpaid Principal Balance/
Notional		Fair ValueUnpaid Principal Balance/
Notional		Fair Value
Residential mortgage loans held for sale$161,717 $159,355 $182,710 $186,175 
Residential mortgage loan commitments160,260 2,869 171,412 6,167 
Forward sales contracts310,237 7,250 328,433 (47)
  $169,474  $192,295 
Mortgage Banking Revenue [Table Text Block]
Mortgage banking revenue was as follows (in thousands):
 Three Months Ended
March 31,
 20222021
Production revenue:  
Net realized gains on sale of mortgage loans$6,883 $26,000 
Net change in unrealized gain (loss) on mortgage loans held for sale(5,827)(6,955)
Net change in the fair value of mortgage loan commitments(3,298)(8,980)
Net change in the fair value of forward sales contracts7,297 15,222 
Total production revenue5,055 25,287 
Servicing revenue11,595 11,826 
Total mortgage banking revenue$16,650 $37,113 
Summary of Mortgage Servicing Rights [Table Text Block]
The following represents a summary of mortgage servicing rights (dollars in thousands):
 March 31, 2022December 31, 2021
Number of residential mortgage loans serviced for others99,409 102,008 
Outstanding principal balance of residential mortgage loans serviced for others$16,024,663 $16,442,446 
Weighted average interest rate3.57 %3.58 %
Remaining term (in months)281281
The following represents activity in capitalized mortgage servicing rights (in thousands):
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]
Three Months Ended March 31,
20222021
Beginning Balance$163,198 $101,172 
Additions5,215 9,830 
Change in fair value due to principal payments(7,960)(11,961)
Change in fair value due to market assumption changes49,110 33,874 
Ending Balance$209,563 $132,915 
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, 2022December 31, 2021
Discount rate – risk-free rate plus a market premium8.53%8.39%
Prepayment rate - based upon loan interest rate, original term and loan type8.48%12.11%
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
$1,000 - $4,000
$1,000 - $4,000
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
2.47%1.32%
Primary/secondary mortgage rate spread
105 bps105 bps
Delinquency rate
2.28%2.05%