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Goodwill and Intangible Assets, Mortgage Servicing Rights Roll-Forward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mortgage servicing rights:      
Mortgage servicing rights at beginning of year $ 59,967 $ 67,607 $ 68,433
Additions from acquisition 0 1,357 0
Additions 16,151 13,667 11,606
Amortization (19,436) (22,664) (12,432)
Mortgage servicing rights at end of year 56,682 59,967 67,607
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]      
Valuation allowance at beginning of year (18,006) (302) (239)
(Additions) recoveries, net 16,186 (17,704) (63)
Valuation allowance at end of year (1,820) (18,006) (302)
Mortgage servicing rights, net 54,862 41,961 67,306
Fair value of mortgage servicing rights 57,259 41,990 72,532
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”) $ 6,994,834 $ 7,743,956 $ 8,488,969
Mortgage servicing rights, net to servicing portfolio 0.78% 0.54% 0.79%
Mortgage servicing rights expense (a) $ 3,250 $ 40,369 $ 12,494