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Investment Securities - Other Than Temporarily Impaired Debt Securities (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Number of investment securities in unrealized loss positions | security 229 198
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Held-to-maturity, Less than 12 continuous months, Fair value $ 3,078 $ 31,051
Held-to-maturity, Less than 12 continuous months, Unrealized loss (12) (205)
Held-to-maturity, Greater than 12 continuous months, Fair value 127,053 60,669
Held-to-maturity, Greater than 12 continuous months, Unrealized loss (3,510) (414)
Held-to-maturity, Total securities in a loss position, Fair value 130,131 91,720
Held-to-maturity, Total securities in a loss position, Unrealized loss (3,522) (619)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale, Less than 12 continuous months, Fair value 81,533 212,675
Available-for-sale, Less than 12 continuous months, Unrealized loss (657) (1,465)
Available-for-sale, Greater than 12 continuous months, Fair value 234,850 40,478
Available-for-sale, Greater than 12 continuous months, Unrealized loss (4,537) (927)
Available-for-sale, Unrealized loss position, Fair value 316,383 253,153
Available-for-sale, Total securities in a loss position, Unrealized loss (5,194) (2,392)
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract]    
Total temporarily impaired securities, Less than 12 continuous months, Fair value 84,611 243,726
Total temporarily impaired securities, Less than 12 continuous months, Unrealized loss (669) (1,670)
Total temporarily impaired securities, Greater than 12 continuous months, Fair value 361,903 101,147
Total temporarily impaired securities, Greater than 12 continuous months, Unrealized loss (8,047) (1,341)
Total temporarily impaired securities, Total securities in a loss position, Fair value 446,514 344,873
Total temporarily impaired securities, Total securities in a loss position, Unrealized loss $ (8,716) (3,011)
Number of securities in continuous loss position for more than 12 months | security 188  
Number of securities in continuous loss position for less than 12 months | security 41  
MBS pass-through securities issued by FHLMC and FNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Held-to-maturity, Less than 12 continuous months, Fair value $ 198 16,337
Held-to-maturity, Less than 12 continuous months, Unrealized loss (9) (143)
Held-to-maturity, Greater than 12 continuous months, Fair value 83,990 46,845
Held-to-maturity, Greater than 12 continuous months, Unrealized loss (2,800) (371)
Held-to-maturity, Total securities in a loss position, Fair value 84,188 63,182
Held-to-maturity, Total securities in a loss position, Unrealized loss (2,809) (514)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale, Less than 12 continuous months, Fair value 19,971 32,189
Available-for-sale, Less than 12 continuous months, Unrealized loss (128) (121)
Available-for-sale, Greater than 12 continuous months, Fair value 50,077 15,325
Available-for-sale, Greater than 12 continuous months, Unrealized loss (1,102) (302)
Available-for-sale, Unrealized loss position, Fair value 70,048 47,514
Available-for-sale, Total securities in a loss position, Unrealized loss (1,230) (423)
CMOs issued by FNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Held-to-maturity, Less than 12 continuous months, Fair value 0  
Held-to-maturity, Less than 12 continuous months, Unrealized loss 0  
Held-to-maturity, Greater than 12 continuous months, Fair value 11,327  
Held-to-maturity, Greater than 12 continuous months, Unrealized loss (120)  
Held-to-maturity, Total securities in a loss position, Fair value 11,327  
Held-to-maturity, Total securities in a loss position, Unrealized loss (120) 0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale, Less than 12 continuous months, Fair value 2,345 26,401
Available-for-sale, Less than 12 continuous months, Unrealized loss (8) (171)
Available-for-sale, Greater than 12 continuous months, Fair value 16,138 5,440
Available-for-sale, Greater than 12 continuous months, Unrealized loss (322) (77)
Available-for-sale, Unrealized loss position, Fair value 18,483 31,841
Available-for-sale, Total securities in a loss position, Unrealized loss (330) (248)
Obligations of state and political subdivisions    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Held-to-maturity, Less than 12 continuous months, Fair value 0 3,648
Held-to-maturity, Less than 12 continuous months, Unrealized loss 0 (31)
Held-to-maturity, Greater than 12 continuous months, Fair value 3,565 0
Held-to-maturity, Greater than 12 continuous months, Unrealized loss (23) 0
Held-to-maturity, Total securities in a loss position, Fair value 3,565 3,648
Held-to-maturity, Total securities in a loss position, Unrealized loss (23) (31)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale, Less than 12 continuous months, Fair value 15,290 52,197
Available-for-sale, Less than 12 continuous months, Unrealized loss (54) (288)
Available-for-sale, Greater than 12 continuous months, Fair value 52,804 19,548
Available-for-sale, Greater than 12 continuous months, Unrealized loss (1,166) (546)
Available-for-sale, Unrealized loss position, Fair value 68,094 71,745
Available-for-sale, Total securities in a loss position, Unrealized loss (1,220) (834)
CMOs issued by FHLMC    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Held-to-maturity, Less than 12 continuous months, Fair value 2,880 11,066
Held-to-maturity, Less than 12 continuous months, Unrealized loss (3) (31)
Held-to-maturity, Greater than 12 continuous months, Fair value 28,171 13,824
Held-to-maturity, Greater than 12 continuous months, Unrealized loss (567) (43)
Held-to-maturity, Total securities in a loss position, Fair value 31,051 24,890
Held-to-maturity, Total securities in a loss position, Unrealized loss (570) (74)
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale, Less than 12 continuous months, Fair value 24,094 69,276
Available-for-sale, Less than 12 continuous months, Unrealized loss (330) (628)
Available-for-sale, Greater than 12 continuous months, Fair value 74,243 0
Available-for-sale, Greater than 12 continuous months, Unrealized loss (1,267) 0
Available-for-sale, Unrealized loss position, Fair value 98,337 69,276
Available-for-sale, Total securities in a loss position, Unrealized loss (1,597) (628)
CMOs issued by GNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Held-to-maturity, Total securities in a loss position, Unrealized loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale, Less than 12 continuous months, Fair value 1,666 14,230
Available-for-sale, Less than 12 continuous months, Unrealized loss (7) (194)
Available-for-sale, Greater than 12 continuous months, Fair value 9,112 0
Available-for-sale, Greater than 12 continuous months, Unrealized loss (267) 0
Available-for-sale, Unrealized loss position, Fair value 10,778 14,230
Available-for-sale, Total securities in a loss position, Unrealized loss (274) (194)
Corporate bonds    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale, Less than 12 continuous months, Fair value 0 3,060
Available-for-sale, Less than 12 continuous months, Unrealized loss 0 (3)
Available-for-sale, Greater than 12 continuous months, Fair value 1,004
Available-for-sale, Greater than 12 continuous months, Unrealized loss (14)
Available-for-sale, Unrealized loss position, Fair value 1,004 3,060
Available-for-sale, Total securities in a loss position, Unrealized loss (14) (3)
SBA-backed securities    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]    
Held-to-maturity, Total securities in a loss position, Unrealized loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale, Less than 12 continuous months, Fair value 13,175 11,028
Available-for-sale, Less than 12 continuous months, Unrealized loss (122) (53)
Available-for-sale, Greater than 12 continuous months, Fair value 20,123 165
Available-for-sale, Greater than 12 continuous months, Unrealized loss (284) (2)
Available-for-sale, Unrealized loss position, Fair value 33,298 11,193
Available-for-sale, Total securities in a loss position, Unrealized loss (406) (55)
Debentures of government- sponsored agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale, Less than 12 continuous months, Fair value 4,992 2,984
Available-for-sale, Less than 12 continuous months, Unrealized loss (8) (5)
Available-for-sale, Greater than 12 continuous months, Fair value 11,349 0
Available-for-sale, Greater than 12 continuous months, Unrealized loss (115) 0
Available-for-sale, Unrealized loss position, Fair value 16,341 2,984
Available-for-sale, Total securities in a loss position, Unrealized loss (123) (5)
Privately issued CMOs    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available-for-sale, Less than 12 continuous months, Fair value 1,310
Available-for-sale, Less than 12 continuous months, Unrealized loss (2)
Available-for-sale, Greater than 12 continuous months, Fair value 0
Available-for-sale, Greater than 12 continuous months, Unrealized loss 0
Available-for-sale, Unrealized loss position, Fair value 0 1,310
Available-for-sale, Total securities in a loss position, Unrealized loss $ 0 $ (2)