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Fair Value - Recurring Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
[2]
Dec. 31, 2015
Trading securities:        
Total trading securities $ 0 $ 20,447 [1]    
Equity securities, at fair value 30,806 0    
Securities available-for-sale:        
Securities available-for-sale, at fair value 2,272,009      
Securities available-for-sale, at fair value   1,884,209    
Mortgage servicing rights (MSRs) 6,730 [2] 5,894 [2] $ 6,120 $ 1,853
U.S. treasury securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value 37,767      
Securities available-for-sale, at fair value   46,345    
U.S. agency securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value 142,563      
Securities available-for-sale, at fair value   156,847    
CMOs        
Securities available-for-sale:        
Securities available-for-sale, at fair value 1,315,209      
Securities available-for-sale, at fair value   1,095,186    
MBSs        
Securities available-for-sale:        
Securities available-for-sale, at fair value 466,934      
Securities available-for-sale, at fair value   369,543    
Municipal securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value 227,187      
Securities available-for-sale, at fair value   208,991    
Corporate debt securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value 82,349      
Securities available-for-sale, at fair value   0    
Equity securities        
Trading securities:        
Equity securities, at fair value [1] 30,806      
Securities available-for-sale:        
Securities available-for-sale, at fair value [1]   7,297    
Recurring | Level 1        
Trading securities:        
Money market funds 0 1,685    
Mutual funds 0 18,762    
Total trading securities [3] 0 20,447    
Equity securities, at fair value [3] 19,658 0    
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 37,767      
Securities available-for-sale, at fair value [3]   46,345    
Mortgage servicing rights (MSRs) [4] 0 0    
Derivative assets [4] 0 0    
Liabilities        
Derivative liabilities [5] 0 0    
Recurring | Level 1 | U.S. treasury securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 37,767      
Securities available-for-sale, at fair value [3]   46,345    
Recurring | Level 1 | U.S. agency securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 0      
Securities available-for-sale, at fair value [3]   0    
Recurring | Level 1 | CMOs        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 0      
Securities available-for-sale, at fair value [3]   0    
Recurring | Level 1 | MBSs        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 0      
Securities available-for-sale, at fair value [3]   0    
Recurring | Level 1 | Municipal securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 0      
Securities available-for-sale, at fair value [3]   0    
Recurring | Level 1 | Corporate debt securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 0      
Securities available-for-sale, at fair value [3]   0    
Recurring | Level 1 | Equity securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3]   0    
Recurring | Level 2        
Trading securities:        
Money market funds 0 0    
Mutual funds 0 0    
Total trading securities [3] 0 0    
Equity securities, at fair value [3] 11,148 0    
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 2,234,242      
Securities available-for-sale, at fair value [3]   1,837,864    
Mortgage servicing rights (MSRs) [4] 0 0    
Derivative assets [4] 32,057 21,068    
Liabilities        
Derivative liabilities [5] 28,861 25,250    
Recurring | Level 2 | U.S. treasury securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 0      
Securities available-for-sale, at fair value [3]   0    
Recurring | Level 2 | U.S. agency securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 142,563      
Securities available-for-sale, at fair value [3]   156,847    
Recurring | Level 2 | CMOs        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 1,315,209      
Securities available-for-sale, at fair value [3]   1,095,186    
Recurring | Level 2 | MBSs        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 466,934      
Securities available-for-sale, at fair value [3]   369,543    
Recurring | Level 2 | Municipal securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 227,187      
Securities available-for-sale, at fair value [3]   208,991    
Recurring | Level 2 | Corporate debt securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 82,349      
Securities available-for-sale, at fair value [3]   0    
Recurring | Level 2 | Equity securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3]   7,297    
Recurring | Level 3        
Trading securities:        
Money market funds 0 0    
Mutual funds 0 0    
Total trading securities [3] 0 0    
Equity securities, at fair value [3] 0 0    
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 0      
Securities available-for-sale, at fair value [3]   0    
Mortgage servicing rights (MSRs) [4] 6,730 5,894    
Derivative assets [4] 0 0    
Liabilities        
Derivative liabilities [5] 0 0    
Recurring | Level 3 | U.S. treasury securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 0      
Securities available-for-sale, at fair value [3]   0    
Recurring | Level 3 | U.S. agency securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 0      
Securities available-for-sale, at fair value [3]   0    
Recurring | Level 3 | CMOs        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 0      
Securities available-for-sale, at fair value [3]   0    
Recurring | Level 3 | MBSs        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 0      
Securities available-for-sale, at fair value [3]   0    
Recurring | Level 3 | Municipal securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] 0      
Securities available-for-sale, at fair value [3]   0    
Recurring | Level 3 | Corporate debt securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3] $ 0      
Securities available-for-sale, at fair value [3]   0    
Recurring | Level 3 | Equity securities        
Securities available-for-sale:        
Securities available-for-sale, at fair value [3]   $ 0    
[1] As a result of accounting guidance adopted in 2018, equity securities are no longer presented within trading securities or securities available-for-sale and are now presented within equity securities in the Consolidated Statements of Financial Condition for the current period. For further discussion of this guidance, see Note 2. "Recent Accounting Pronouncements."
[2] Included in other assets in the Consolidated Statements of Financial Condition.
[3] As a result of recently adopted accounting guidance, equity securities are no longer presented within trading securities or securities available-for-sale for the prior period and are not presented within equity securities for the current period. For further discussion of this guidance, see Note 2 of "Notes to the Consolidated Financial Statements" in Item 8 of this Form 10-K.
[4] Included in other assets in the Consolidated Statements of Financial Condition.
[5] Included in other liabilities in the Consolidated Statements of Financial Condition.