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Fair Value - Recurring Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Assets            
Equity securities $ 114,848   $ 76,404      
Securities available-for-sale            
Securities available-for-sale, at fair value 3,212,908   3,096,408      
Mortgage servicing rights (MSRs) 6,306 $ 6,269 4,899 $ 4,458 $ 4,464 $ 5,858
U.S. treasury securities            
Securities available-for-sale            
Securities available-for-sale, at fair value 0   12,051      
U.S. agency securities            
Securities available-for-sale            
Securities available-for-sale, at fair value 656,112   652,474      
CMOs            
Securities available-for-sale            
Securities available-for-sale, at fair value 1,295,544   1,438,518      
MBSs            
Securities available-for-sale            
Securities available-for-sale, at fair value 856,096   580,840      
Municipal securities            
Securities available-for-sale            
Securities available-for-sale, at fair value 224,618   236,015      
Corporate debt securities            
Securities available-for-sale            
Securities available-for-sale, at fair value 180,538   176,510      
Recurring | Level 1            
Assets            
Equity securities 87,232   52,888      
Securities available-for-sale            
Securities available-for-sale, at fair value 0   12,051      
Mortgage servicing rights (MSRs) 0   0      
Derivative assets 0   0      
Liabilities            
Derivative liabilities 0   0      
Recurring | Level 1 | U.S. treasury securities            
Securities available-for-sale            
Securities available-for-sale, at fair value 0   12,051      
Recurring | Level 1 | U.S. agency securities            
Securities available-for-sale            
Securities available-for-sale, at fair value 0   0      
Recurring | Level 1 | CMOs            
Securities available-for-sale            
Securities available-for-sale, at fair value 0   0      
Recurring | Level 1 | MBSs            
Securities available-for-sale            
Securities available-for-sale, at fair value 0   0      
Recurring | Level 1 | Municipal securities            
Securities available-for-sale            
Securities available-for-sale, at fair value 0   0      
Recurring | Level 1 | Corporate debt securities            
Securities available-for-sale            
Securities available-for-sale, at fair value 0   0      
Recurring | Level 2            
Assets            
Equity securities 22,616   18,516      
Securities available-for-sale            
Securities available-for-sale, at fair value 3,212,908   3,084,357      
Mortgage servicing rights (MSRs) 0   0      
Derivative assets 91,170   153,704      
Liabilities            
Derivative liabilities 30,729   44,581      
Recurring | Level 2 | U.S. treasury securities            
Securities available-for-sale            
Securities available-for-sale, at fair value 0   0      
Recurring | Level 2 | U.S. agency securities            
Securities available-for-sale            
Securities available-for-sale, at fair value 656,112   652,474      
Recurring | Level 2 | CMOs            
Securities available-for-sale            
Securities available-for-sale, at fair value 1,295,544   1,438,518      
Recurring | Level 2 | MBSs            
Securities available-for-sale            
Securities available-for-sale, at fair value 856,096   580,840      
Recurring | Level 2 | Municipal securities            
Securities available-for-sale            
Securities available-for-sale, at fair value 224,618   236,015      
Recurring | Level 2 | Corporate debt securities            
Securities available-for-sale            
Securities available-for-sale, at fair value 180,538   176,510      
Recurring | Level 3            
Assets            
Equity securities 0   0      
Securities available-for-sale            
Securities available-for-sale, at fair value 0   0      
Mortgage servicing rights (MSRs) 6,306   4,899      
Derivative assets 0   0      
Liabilities            
Derivative liabilities 0   0      
Recurring | Level 3 | U.S. treasury securities            
Securities available-for-sale            
Securities available-for-sale, at fair value 0   0      
Recurring | Level 3 | U.S. agency securities            
Securities available-for-sale            
Securities available-for-sale, at fair value 0   0      
Recurring | Level 3 | CMOs            
Securities available-for-sale            
Securities available-for-sale, at fair value 0   0      
Recurring | Level 3 | MBSs            
Securities available-for-sale            
Securities available-for-sale, at fair value 0   0      
Recurring | Level 3 | Municipal securities            
Securities available-for-sale            
Securities available-for-sale, at fair value 0   0      
Recurring | Level 3 | Corporate debt securities            
Securities available-for-sale            
Securities available-for-sale, at fair value $ 0   $ 0