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Securities Available for Sale - Continuous Unrealized Loss Position of Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value $ 217,762 $ 548,803
Less than 12 months, gross unrealized (losses) (1,748) (8,454)
12 months or longer, fair value 552,442 58,068
12 months or longer, gross unrealized (losses) (18,310) (2,378)
Total, fair value 770,204 606,871
Total, gross unrealized (losses) (20,058) (10,832)
U.S. government and agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 14,668 29,654
Less than 12 months, gross unrealized (losses) (202) (282)
12 months or longer, fair value 29,437 0
12 months or longer, gross unrealized (losses) (515) 0
Total, fair value 44,105 29,654
Total, gross unrealized (losses) (717) (282)
Mortgage-backed securities and collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 176,614 514,283
Less than 12 months, gross unrealized (losses) (1,034) (8,037)
12 months or longer, fair value 509,397 48,788
12 months or longer, gross unrealized (losses) (16,402) (1,658)
Total, fair value 686,011 563,071
Total, gross unrealized (losses) (17,436) (9,695)
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 26,480 4,866
Less than 12 months, gross unrealized (losses) (512) (135)
12 months or longer, fair value 9,358 4,624
12 months or longer, gross unrealized (losses) (643) (376)
Total, fair value 35,838 9,490
Total, gross unrealized (losses) (1,155) (511)
Trust preferred securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, fair value 0 0
Less than 12 months, gross unrealized (losses) 0 0
12 months or longer, fair value 4,250 4,656
12 months or longer, gross unrealized (losses) (750) (344)
Total, fair value 4,250 4,656
Total, gross unrealized (losses) $ (750) $ (344)