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Tax Credit Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Income Tax Disclosure [Abstract]          
Affordable housing tax credit investment, net $ 167,434   $ 167,434   $ 152,203
Other tax credit investments, net 47,645   47,645   59,224
Total TCIs, net 215,079   215,079   211,427
Unfunded affordable housing tax credit commitments 54,420   54,420   31,562
Other tax credit liabilities 38,845   38,845   49,491
Total unfunded tax credit commitments and liabilities 93,265   93,265   $ 81,053
Affordable housing tax credits and other tax benefits (6,515) $ (7,290) (19,546) $ (21,678)  
Other tax credit investment credits and tax benefits (723) (1,240) (2,168) (3,122)  
Amortization of affordable housing investments, net of tax benefit 4,344 5,024 13,033 15,071  
Deferred tax expense 159 275 479 691  
Total net reduction in income tax expense (2,735) (3,231) (8,202) (9,038)  
Affordable housing tax credits investment 1,002 1,021 3,006 3,065  
Other tax credit investment amortization 544 673 1,634 1,529  
Total amortization of TCIs $ 1,546 $ 1,694 $ 4,640 $ 4,594