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Mortgage Banking Activities (Tables)
 12 Months Ended
Dec. 31, 2021
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 and their related fair values included in Mortgage loans held for sale on the Consolidated Balance Sheets were (in thousands):
 December 31, 2021December 31, 2020
 Unpaid Principal Balance/
Notional		Fair ValueUnpaid Principal Balance/
Notional		Fair Value
Residential mortgage loans held for sale$182,710 $186,175 $227,161 $236,444 
Residential mortgage loan commitments171,412 6,167 380,637 20,435 
Forward sales contracts328,433 (47)549,414 (4,563)
  $192,295  $252,316 

No residential mortgage loans held for sale were 90 days or more past due or considered impaired as of December 31, 2021 or December 31, 2020. No credit losses were recognized on residential mortgage loans held for sale for the years ended December 31, 2021, 2020 and 2019.
Mortgage Banking Revenue [Table Text Block]
Mortgage banking revenue was as follows (in thousands):
 Year Ended
 202120202019
Production revenue:  
Net realized gains on sales of mortgage loans$76,282 $107,847 $39,730 
Net change in unrealized gain on mortgage loans held for sale(5,818)6,697 672 
Net change in the fair value of mortgage loan commitments(14,268)15,202 (145)
Net change in the fair value of forward sales contracts4,516 (3,898)2,463 
Total mortgage production revenue60,712 125,848 42,720 
Servicing revenue45,184 56,512 64,821 
Total mortgage banking revenue$105,896 $182,360 $107,541 
Summary of Mortgage Servicing Rights [Table Text Block]
The following represents a summary of mortgage servicing rights (Dollars in thousands):
December 31,
 202120202019
Number of residential mortgage loans serviced for others102,008 106,201 126,828 
Outstanding principal balance of residential mortgage loans serviced for others$16,442,446 $16,228,449 $20,727,106 
Weighted average interest rate3.58 %3.84 %3.98 %
Remaining contractual term (in months)281280289
Activity in Capitalized Mortgage Servicing Rights [Table Text Block]
Activity in capitalized mortgage servicing rights during the three years ended December 31, 2021 is as follows (in thousands):
Balance, December 31, 2018$259,254 
Additions35,128 
Change in fair value due to loan runoff(38,979)
Change in fair value due to market changes(53,517)
Balance, December 31, 2019201,886 
Additions31,209 
Disposals(10,801)
Change in fair value due to loan runoff(41,598)
Change in fair value due to market changes(79,524)
Balance, December 31, 2020101,172 
Additions31,132 
Acquisitions28,018 
Change in fair value due to loan runoff(38,761)
Change in fair value due to market changes41,637 
Balance, December 31, 2021$163,198 
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,
 20212020
Discount rate – risk-free rate plus a market premium8.39%9.14%
Prepayment rate - based upon loan interest rate, original term and loan type12.11%19.73%
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
Primary/secondary mortgage rate spread
105 bps105 bps
Escrow earnings rate – indexed to rates paid on deposit accounts with comparable average life
1.32%0.43%
Delinquency rate
2.05%3.54%