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Securities (Tables)
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Cost and Fair Value of Available for Sale Securities
The following table summarizes the amortized cost and fair value of the AFS securities portfolio at December 31, 2019 and 2018 and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive loss. 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
December 31, 2019
Mortgage-backed securities: residential$374,923  $1,876  $(856) $375,943  
    Mortgage-backed securities: commercial17,858  56  (134) 17,780  
Corporate Notes32,825  539  (3) 33,361  
State and political subdivisions222,624  2,566  (142) 225,048  
Total$648,230  $5,037  $(1,135) $652,132  
December 31, 2018
U.S. Treasury securities$253,015  $59  $(60) $253,014  
U.S. government sponsored entities and agencies21,999  1  (112) 21,888  
Mortgage-backed securities: residential596,766  27  (16,094) 580,699  
Asset-backed securities25,744  —  (900) 24,844  
Corporate Notes12,480  21  (77) 12,424  
State and political subdivisions141,432  863  (4,496) 137,799  
Total$1,051,436  $971  $(21,739) $1,030,668  
Schedule of Amortized Cost and Fair Value of HTM Securities Portfolio The amortized cost and fair value of the HTM securities portfolio at December 31, 2018 and the corresponding amounts of gross unrecognized gains and losses were as follows:
Amortized
Cost		Gross
Unrecognized
Gains		Gross
Unrecognized
Losses		Fair
Value
December 31, 2018
Mortgage backed securities: residential$75,944  $34  $(3,072) $72,906  
State and political subdivisions45,673  466  (90) 46,049  
Total$121,617  $500  $(3,162) $118,955  
Summary of Proceeds from Sales, Calls, and Prepayments of Available for Sale Securities and Associated Gains and Losses The proceeds from sales, calls, and prepayments of available for sale securities and the associated gains and losses were as follows:
201920182017
Proceeds from sales$582,950  $176,016  $240,175  
Gross gains6,074  54  1,553  
Gross losses(4,031) (4,214) (657) 
Schedule of Amortized Cost and Fair Value of Investment Securities Portfolio by Contractual Maturity
The amortized cost and fair value of the investment securities portfolio are shown by contractual maturity. Securities not due at a single maturity date, primarily mortgage-backed securities, and asset-backed securities are shown separately.

December 31, 2019
Amortized
Cost		Fair
Value
Available for sale
Three months or less$—  $—  
Over three months through one year—  —  
Over one year through five years1,609  1,641  
Over five years through ten years37,406  37,918  
Over ten years216,434  218,850  
Mortgage-backed securities: residential374,923  375,943  
    Mortgage-backed securities: commercial17,858  17,780  
Total$648,230  $652,132  
Schedule of Unrealized Losses and Fair Value by Major Security Type
The following table summarizes the securities with unrealized and unrecognized losses at December 31, 2019 and 2018, aggregated by major security type and length of time in a continuous unrealized loss position:

Less Than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
December 31, 2019
Available for sale
Mortgage-backed securities: residential$49,390  $(172) $91,644  $(684) $141,034  $(856) 
    Mortgage-backed securities: commercial4,436  (29) 7,286  (105) 11,722  (134) 
  Corporate notes997  (3) —  —  997  (3) 
State and political subdivisions29,843  (142) —  —  29,843  (142) 
Total available for sale$84,666  $(346) $98,930  $(789) $183,596  $(1,135) 
Less Than 12 Months12 Months or LongerTotal
Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
December 31, 2018
Available for sale
U.S. Treasury securities$163,722  $(60) $—  $—  $163,722  $(60) 
U.S. government sponsored entities and agencies1,355  (12) 19,937  (100) 21,292  (112) 
Mortgage-backed securities: residential83,203  (755) 490,752  (15,339) 573,955  (16,094) 
Mortgage-backed securities: commercial24,845  (900) —  —  24,845  (900) 
Corporate Notes9,839  (77) —  —  9,839  (77) 
State and political subdivisions10,446  (106) 69,238  (4,390) 79,684  (4,496) 
Total available for sale$293,410  $(1,910) $579,927  $(19,829) $873,337  $(21,739) 

Less Than 12 Months12 Months or LongerTotal
December 31, 2018Fair
Value		Unrecognized
Losses		Fair
Value		Unrecognized
Losses		Fair
Value		Unrecognized
Losses
Held to maturity
Mortgage-backed securities: residential$2,239  $(40) $68,067  $(3,032) $70,306  $(3,072) 
State and political subdivisions8,362  (39) 3,675  (51) 12,037  (90) 
Total held to maturity$10,601  $(79) $71,742  $(3,083) $82,343  $(3,162)