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Debt (Junior Subordinated Debentures Outstanding) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Carrying Value $ 71,883 $ 71,323
Junior subordinated debenture, purchase accounting adjustment 38,900 39,500
Junior Subordinated Debentures [Member]    
Debt Instrument [Line Items]    
Carrying Value [1] 71,883 71,323
Initial Equity In Trust [2] $ 1,705  
BST I [Member]    
Debt Instrument [Line Items]    
Issue Date Mar. 15, 2005  
Interest Rate Terms 3-month LIBOR+ 4.90%  
Interest Rate 7.22%  
Maturity Date Mar. 30, 2035  
BST I [Member] | Junior Subordinated Debentures [Member]    
Debt Instrument [Line Items]    
Carrying Value [1] $ 15,018 14,900
Initial Equity In Trust [2] $ 355  
BST I [Member] | Junior Subordinated Debentures [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Basis spread on rate 4.90%  
BST II [Member]    
Debt Instrument [Line Items]    
Issue Date May 04, 2005  
Interest Rate Terms 3-month LIBOR + 4.85%  
Interest Rate 7.12%  
Maturity Date Jul. 30, 2035  
BST II [Member] | Junior Subordinated Debentures [Member]    
Debt Instrument [Line Items]    
Carrying Value [1] $ 16,816 16,688
Initial Equity In Trust [2] $ 401  
BST II [Member] | Junior Subordinated Debentures [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Basis spread on rate 4.85%  
BST III [Member]    
Debt Instrument [Line Items]    
Issue Date May 10, 2005  
Interest Rate Terms 3-month LIBOR + 4.85%  
Interest Rate 7.12%  
Maturity Date Jul. 30, 2035  
BST III [Member] | Junior Subordinated Debentures [Member]    
Debt Instrument [Line Items]    
Carrying Value [1] $ 6,805 6,755
Initial Equity In Trust [2] $ 164  
BST III [Member] | Junior Subordinated Debentures [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Basis spread on rate 4.85%  
BST IV [Member]    
Debt Instrument [Line Items]    
Issue Date Apr. 24, 2006  
Interest Rate Terms 3-month LIBOR+ 4.85%  
Interest Rate 7.17%  
Maturity Date Jun. 30, 2036  
BST IV [Member] | Junior Subordinated Debentures [Member]    
Debt Instrument [Line Items]    
Carrying Value [1] $ 10,012 9,933
Initial Equity In Trust [2] $ 237  
BST IV [Member] | Junior Subordinated Debentures [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Basis spread on rate 4.85%  
BST V [Member]    
Debt Instrument [Line Items]    
Issue Date Jul. 21, 2006  
Interest Rate Terms 3-month LIBOR+ 4.85%  
Interest Rate 7.17%  
Maturity Date Sep. 30, 2036  
BST V [Member] | Junior Subordinated Debentures [Member]    
Debt Instrument [Line Items]    
Carrying Value [1] $ 10,012 9,933
Initial Equity In Trust [2] $ 237  
BST V [Member] | Junior Subordinated Debentures [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Basis spread on rate 4.85%  
BST VI [Member]    
Debt Instrument [Line Items]    
Issue Date Feb. 26, 2007  
Interest Rate Terms 3-month LIBOR+ 4.80%  
Interest Rate 7.07%  
Maturity Date Apr. 30, 2037  
BST VI [Member] | Junior Subordinated Debentures [Member]    
Debt Instrument [Line Items]    
Carrying Value [1] $ 13,220 $ 13,114
Initial Equity In Trust [2] $ 311  
BST VI [Member] | Junior Subordinated Debentures [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Basis spread on rate 4.80%  
[1] Amounts include purchase accounting adjustments which reduced the total carrying value by $38.9 million and $39.5 million as of September 30, 2019 and December 31, 2018, respectively.
[2] Initial Equity in Trust is recorded as part of other assets in the unaudited Consolidated Balance Sheets.