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Fair Value (Details) - Fair Value Measurements - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Trading securities:        
Total trading securities $ 19,130 $ 17,920    
Securities Available-for-Sale        
Securities available-for-sale, at fair value 1,937,124 1,919,450    
Mortgage servicing rights (MSRs) 6,245 6,120 $ 5,022 $ 1,853
U.S. treasury securities        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 48,516 48,541    
U.S. agency securities        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 181,030 183,637    
MBSs        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 352,966 332,655    
Municipal securities        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 262,710 270,846    
CDOs        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 33,436 33,260    
Equity securities        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 7,102 3,065    
Recurring | Level 1        
Trading securities:        
Money market funds 1,768 1,645    
Mutual funds 17,362 16,275    
Total trading securities 19,130 17,920    
Securities Available-for-Sale        
Securities available-for-sale, at fair value 48,516 48,541    
Mortgage servicing rights (MSRs) [1] 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 48,516 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 1,855,172 1,837,649    
Mortgage servicing rights (MSRs) [1] 0    
Derivative assets [1] 19,800 18,880    
Liabilities:        
Derivative liabilities [2] 24,234 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 181,030 183,637    
Recurring | Level 2 | CMOs        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 1,051,364 1,047,446    
Recurring | Level 2 | MBSs        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 352,966 332,655    
Recurring | Level 2 | Municipal securities        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 262,710 270,846    
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 7,102 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 33,436 33,260    
Mortgage servicing rights (MSRs) [1] 6,245 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 33,436 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.