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Fair Value - Recurring Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Trading securities:            
Total trading securities $ 20,425   $ 17,920      
Securities Available-for-Sale            
Securities available-for-sale, at fair value 1,732,984   1,919,450      
Mortgage servicing rights (MSRs) 5,766 $ 5,925 6,120 $ 5,076 $ 4,938 $ 1,853
U.S. treasury securities            
Securities Available-for-Sale            
Securities available-for-sale, at fair value 42,504   48,541      
U.S. agency securities            
Securities Available-for-Sale            
Securities available-for-sale, at fair value 154,607   183,637      
MBSs            
Securities Available-for-Sale            
Securities available-for-sale, at fair value 355,473   332,655      
Municipal securities            
Securities Available-for-Sale            
Securities available-for-sale, at fair value 205,024   270,846      
CDOs            
Securities Available-for-Sale            
Securities available-for-sale, at fair value 30,826   33,260      
Equity securities            
Securities Available-for-Sale            
Securities available-for-sale, at fair value 7,328   3,065      
Recurring | Level 1            
Trading securities:            
Money market funds 1,738   1,645      
Mutual funds 18,687   16,275      
Total trading securities 20,425   17,920      
Securities Available-for-Sale            
Securities available-for-sale, at fair value 42,504   48,541      
Mortgage servicing rights (MSRs) [1] 0   0      
Derivative assets [1] 0   0      
Liabilities:            
Derivative liabilities [2] 0   0      
Recurring | Level 1 | U.S. treasury securities            
Securities Available-for-Sale            
Securities available-for-sale, at fair value 42,504   48,541      
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 | CDOs            
Securities Available-for-Sale            
Securities available-for-sale, at fair value 0   0      
Recurring | Level 1 | Equity securities            
Securities Available-for-Sale            
Securities available-for-sale, at fair value 0   0      
Recurring | Level 2            
Trading securities:            
Money market funds 0   0      
Mutual funds 0   0      
Total trading securities 0   0      
Securities Available-for-Sale            
Securities available-for-sale, at fair value 1,659,654   1,837,649      
Mortgage servicing rights (MSRs) [1] 0   0      
Derivative assets [1] 21,502   18,880      
Liabilities:            
Derivative liabilities [2] 21,318   21,150      
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 154,607   183,637      
Recurring | Level 2 | CMOs            
Securities Available-for-Sale            
Securities available-for-sale, at fair value 937,222   1,047,446      
Recurring | Level 2 | MBSs            
Securities Available-for-Sale            
Securities available-for-sale, at fair value 355,473   332,655      
Recurring | Level 2 | Municipal securities            
Securities Available-for-Sale            
Securities available-for-sale, at fair value 205,024   270,846      
Recurring | Level 2 | CDOs            
Securities Available-for-Sale            
Securities available-for-sale, at fair value 0   0      
Recurring | Level 2 | Equity securities            
Securities Available-for-Sale            
Securities available-for-sale, at fair value 7,328   3,065      
Recurring | Level 3            
Trading securities:            
Money market funds 0   0      
Mutual funds 0   0      
Total trading securities 0   0      
Securities Available-for-Sale            
Securities available-for-sale, at fair value 30,826   33,260      
Mortgage servicing rights (MSRs) [1] 5,766   6,120      
Derivative assets [1] 0   0      
Liabilities:            
Derivative liabilities [2] 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 | CDOs            
Securities Available-for-Sale            
Securities available-for-sale, at fair value 30,826   33,260      
Recurring | Level 3 | Equity securities            
Securities Available-for-Sale            
Securities available-for-sale, at fair value $ 0   $ 0      
[1] Included in other assets in the Consolidated Statements of Financial Condition.
[2] Included in other liabilities in the Consolidated Statements of Financial Condition.