XML 154 R73.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
security
Dec. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
Investment Holdings [Line Items]          
Debt Securities, Held-to-maturity   $ 148,508 $ 0 $ 148,508  
Debt Securities, Held-to-maturity, Fair Value   144,272 0 144,272  
Available for Sale, Amortized Cost          
Due in one year or less     50,356    
Due after one year through five years     46,846    
Due after five years through ten years     62,562    
Due after ten years     31,037    
Mortgage-backed securities   1,227,931 1,116,545 1,227,931  
Total     1,116,545    
Available for Sale, Estimated Fair Value          
Due in one year or less     50,681    
Due after one year through five years     47,258    
Due after five years through ten years     63,695    
Due after ten years     31,294    
Available-for-sale debt securities, at fair value   1,205,478 1,126,983 1,205,478  
Available for sale          
Gross proceeds from sale of available for sale investment securities $ 53,900 10,000 53,935 10,014 $ 114,536
Purchases of investment securities available for sale     55,011 85,366 $ 356,887
Available-for-sale Securities, Gross Realized Losses $ 36 300      
Investment securities pledged to party with no right to sell or repledge the collateral   $ 980,000 $ 720,000 $ 980,000  
Number of investment securities in an unrealized loss position | security   336 81 336  
Available-for-sale Securities, Equity Securities   $ 826 $ 1,127 $ 826  
Residential - U.S. Government-sponsored entities (GSEs)          
Investment Holdings [Line Items]          
Debt Securities, Held-to-maturity   83,436   83,436  
Debt Securities, Held-to-maturity, Fair Value   80,281   80,281  
Available for Sale, Amortized Cost          
Mortgage-backed securities   736,175 673,918 736,175  
Available for Sale, Estimated Fair Value          
Available-for-sale debt securities, at fair value   717,052 677,822 717,052  
Mortgage Backed Securities Residential U S Government Sponsored Entities [Member]          
Available for Sale, Estimated Fair Value          
Mortgage-backed securities     677,822    
Commercial - U.S. GSEs          
Investment Holdings [Line Items]          
Debt Securities, Held-to-maturity   65,072   65,072  
Debt Securities, Held-to-maturity, Fair Value   63,991   63,991  
Available for Sale, Amortized Cost          
Mortgage-backed securities   134,867 134,676 134,867  
Available for Sale, Estimated Fair Value          
Available-for-sale debt securities, at fair value   134,728 137,817 134,728  
Mortgage-backed Securities, Issued by Private Enterprises, Residential [Member]          
Available for Sale, Amortized Cost          
Mortgage-backed securities   41,245 36,377 41,245  
Available for Sale, Estimated Fair Value          
Available-for-sale debt securities, at fair value   41,118 37,191 41,118  
Commercial - U.S. GSEs and agencies          
Available for Sale, Amortized Cost          
Mortgage-backed securities   53,014 80,773 53,014  
Available for Sale, Estimated Fair Value          
Mortgage-backed securities     37,191    
Available-for-sale debt securities, at fair value   $ 51,483 81,225 $ 51,483  
Mortgage Backed Securities Residential Non Government Agencies [Member]          
Available for Sale, Estimated Fair Value          
Mortgage-backed securities     81,225    
Mortgage Backed Securities Commercial Non Government Agencies [Member]          
Available for Sale, Estimated Fair Value          
Mortgage-backed securities     $ 137,817