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Debt (Junior Subordinated Debentures Outstanding) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Carrying Value $ 70,908 $ 70,384 [1]
Junior subordinated debenture, purchase accounting adjustment 39,900 40,400
Junior Subordinated Debentures [Member]    
Debt Instrument [Line Items]    
Carrying Value [2] 70,908 70,384
Initial Equity In Trust [3] $ 3,327  
BST I [Member]    
Debt Instrument [Line Items]    
Issue Date Mar. 15, 2005  
Interest Rate Terms 3-month LIBOR+ 4.90%  
Interest Rate 7.21%  
Maturity Date Mar. 30, 2035  
BST I [Member] | Junior Subordinated Debentures [Member]    
Debt Instrument [Line Items]    
Carrying Value [2] $ 14,814 14,703
Initial Equity In Trust [3] $ 696  
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 7.21%  
Maturity Date Jul. 30, 2035  
BST II [Member] | Junior Subordinated Debentures [Member]    
Debt Instrument [Line Items]    
Carrying Value [2] $ 16,593 16,472
Initial Equity In Trust [3] $ 774  
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 7.21%  
Maturity Date Jul. 30, 2035  
BST III [Member] | Junior Subordinated Debentures [Member]    
Debt Instrument [Line Items]    
Carrying Value [2] $ 6,717 6,670
Initial Equity In Trust [3] $ 310  
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 7.16%  
Maturity Date Jun. 30, 2036  
BST IV [Member] | Junior Subordinated Debentures [Member]    
Debt Instrument [Line Items]    
Carrying Value [2] $ 9,875 9,802
Initial Equity In Trust [3] $ 464  
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 7.16%  
Maturity Date Sep. 30, 2036  
BST V [Member] | Junior Subordinated Debentures [Member]    
Debt Instrument [Line Items]    
Carrying Value [2] $ 9,875 9,802
Initial Equity In Trust [3] $ 464  
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 7.16%  
Maturity Date Apr. 30, 2037  
BST VI [Member] | Junior Subordinated Debentures [Member]    
Debt Instrument [Line Items]    
Carrying Value [2] $ 13,034 $ 12,935
Initial Equity In Trust [3] $ 619  
BST VI [Member] | Junior Subordinated Debentures [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Basis spread on rate 4.80%  
[1] * See Note 2 for summary of adjustments.
[2] Amounts include purchase accounting adjustments which reduced the total carrying value by $39.9 million and $40.4 million as of June 30, 2018 and December 31, 2017, respectively.
[3] Initial Equity in Trust is recorded as part of other assets in the unaudited Consolidated Balance Sheets.