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Tax Credit Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Income Tax Disclosure [Abstract]      
Affordable housing tax credit investment, net $ 145,888   $ 152,203
Other tax credit investments, net 58,782   59,224
Total TCIs, net 204,670   211,427
Unfunded affordable housing tax credit commitments 30,762   31,562
Other tax credit liabilities 49,491   49,491
Total unfunded tax credit commitments and liabilities 80,253   $ 81,053
Affordable housing tax credits and other tax benefits (6,488) $ (7,194)  
Other tax credit investment credits and tax benefits (723) (941)  
Amortization of affordable housing investments, net of tax benefit 4,366 5,024  
Deferred tax expense 160 208  
Total net reduction in income tax expense (2,685) (2,903)  
Affordable housing tax credits investment 986 1,022  
Other tax credit investment amortization 545 428  
Total amortization of TCIs $ 1,531 $ 1,450