NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS (Tables)	9 Months Ended
	Sep. 30, 2022
Transfers and Servicing [Abstract]
Changes in Servicing Assets [Table Text Block]	The changes in MSRs are shown below for the indicated periods: Quarter Ended Nine-Month Period Ended September 30, September 30, (In thousands) 2022 2021 2022 2021 Balance at beginning of period $ 30,277 $ 32,335 $ 30,986 $ 33,071 Capitalization of servicing assets 679 1,146 2,637 4,046 Amortization (1,247) (1,817) (3,850) (5,374) Temporary impairment recoveries, net 1 12 65 49 Other (1) (20) 9 (148) (107) Balance at end of period $ 29,690 $ 31,685 $ 29,690 $ 31,685 (1) Mainly represents adjustments related to the repurchase of loans serviced for others.
Changes in Impairment Allowance [Table Text Block]	Changes in the impairment allowance were as follows for the indicated periods: Quarter Ended Nine-Month Period Ended September 30, September 30, 2022 2021 2022 2021 (In thousands) Balance at beginning of period $ 14 $ 165 $ 78 $ 202 Recoveries (1) (12) (65) (49) Balance at end of period $ 13 $ 153 $ 13 $ 153
Components of Net Servicing Income [Table Text Block]	The components of net servicing income, included as part of mortgage banking activities in the consolidated statements of income, are shown below for the indicated periods: Quarter Ended Nine-Month Period Ended September 30, September 30, 2022 2021 2022 2021 (In thousands) Servicing fees $ 2,758 $ 3,213 $ 8,398 $ 9,146 Late charges and prepayment penalties 201 87 614 543 Adjustment for loans repurchased (20) (32) (148) (148) Servicing income, gross 2,939 3,268 8,864 9,541 Amortization and impairment of servicing assets (1,246) (1,764) (3,785) (5,284) Servicing income, net $ 1,693 $ 1,504 $ 5,079 $ 4,257
Key Economic Assumptions Used in Determining Fair Value at Time of Sale of Loans [Table Text Block]	The Corporation’s MSRs are subject to prepayment and interest rate risks. Key economic assumptions used in determining the fair value at the time of sale of the related mortgages for the indicated periods ranged as follows: Weighted Average Maximum Minimum Nine-Month Period Ended September 30, 2022: Constant prepayment rate: Government-guaranteed mortgage loans 6.6 % 18.3 % 4.8 % Conventional conforming mortgage loans 6.6 % 18.4 % 3.4 % Conventional non-conforming mortgage loans 6.0 % 21.9 % 3.8 % Discount rate: Government-guaranteed mortgage loans 11.8 % 12.0 % 11.5 % Conventional conforming mortgage loans 9.8 % 10.0 % 9.5 % Conventional non-conforming mortgage loans 12.4 % 14.5 % 11.5 % Nine-Month Period Ended September 30, 2021: Constant prepayment rate: Government-guaranteed mortgage loans 6.1 % 17.4 % 3.7 % Conventional conforming mortgage loans 6.2 % 17.4 % 2.8 % Conventional non-conforming mortgage loans - % - % - % Discount rate: Government-guaranteed mortgage loans 12.0 % 12.0 % 12.0 % Conventional conforming mortgage loans 10.0 % 10.0 % 10.0 % Conventional non-conforming mortgage loans - % - % - %
Weighted-Averages of Key Economic Assumptions in Valuation Model [Table Text Block]	The weighted averages of the key economic assumptions that the Corporation used in its valuation model and the sensitivity of the current fair value to immediate 10% and 20% adverse changes in those assumptions for mortgage loans as of September 30, 2022 and December 31, 2021 were as follows: September 30, December 31, (Dollars in thousands) 2022 2021 Carrying amount of servicing assets $ 29,690 $ 30,986 Fair value $ 44,621 $ 42,132 Weighted-average expected life (in years) 7.86 7.96 Constant prepayment rate (weighted-average annual rate) 6.45 % 6.55 % Decrease in fair value due to 10% adverse change $ 1,048 $ 1,027 Decrease in fair value due to 20% adverse change $ 2,052 $ 2,011 Discount rate (weighted-average annual rate) 10.68 % 11.17 % Decrease in fair value due to 10% adverse change $ 1,923 $ 1,852 Decrease in fair value due to 20% adverse change $ 3,700 $ 3,561