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Fair Value - Recurring Fair Value Measurements (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
[1]
Dec. 31, 2017
Assets        
Equity securities $ 33,304 $ 30,806    
Securities Available-for-Sale        
Securities available-for-sale, at fair value 2,350,195 2,272,009    
Mortgage servicing rights (MSRs) 6,228 [1] 6,730 $ 6,468 $ 5,894
U.S. treasury securities        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 40,892 37,767    
U.S. agency securities        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 128,321 142,563    
CMOs        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 1,357,030 1,315,209    
MBSs        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 487,026 466,934    
Municipal securities        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 233,476 227,187    
Corporate debt securities        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 103,450 82,349    
Recurring | Level 1        
Assets        
Equity securities 22,187 19,658    
Securities Available-for-Sale        
Securities available-for-sale, at fair value 40,892 37,767    
Mortgage servicing rights (MSRs) [2] 0 0    
Derivative assets [2] 0 0    
Liabilities        
Derivative liabilities [3] 0 0    
Recurring | Level 1 | U.S. treasury securities        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 40,892 37,767    
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 11,117 11,148    
Securities Available-for-Sale        
Securities available-for-sale, at fair value 2,309,303 2,234,242    
Mortgage servicing rights (MSRs) [2] 0 0    
Derivative assets [2] 36,786 32,057    
Liabilities        
Derivative liabilities [3] 24,378 28,861    
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 128,321 142,563    
Recurring | Level 2 | CMOs        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 1,357,030 1,315,209    
Recurring | Level 2 | MBSs        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 487,026 466,934    
Recurring | Level 2 | Municipal securities        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 233,476 227,187    
Recurring | Level 2 | Corporate debt securities        
Securities Available-for-Sale        
Securities available-for-sale, at fair value 103,450 82,349    
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) [2] 6,228 6,730    
Derivative assets [2] 0 0    
Liabilities        
Derivative liabilities [3] 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    
[1] Included in other assets in the Consolidated Statements of Financial Condition.
[2] Included in other assets in the Consolidated Statements of Financial Condition.
[3] Included in other liabilities in the Consolidated Statements of Financial Condition.