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Securities - Fair Value of Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Available for sale    
Amortized Cost $ 1,243,312 $ 1,090,363
Gross Unrealized Gains 29,139 43,985
Gross Unrealized Losses (10,276) (323)
Fair Value 1,262,175 1,134,025
Held to maturity    
Amortized Cost 161,650 168,676
Gross Unrealized Gains 9,302 11,314
Gross Unrealized Losses (3) 0
Fair Value 170,949 179,990
U.S. Treasury and federal agencies    
Available for sale    
Amortized Cost 40,155 19,750
Gross Unrealized Gains 0 0
Gross Unrealized Losses (553) (35)
Fair Value 39,602 19,715
State and municipal    
Available for sale    
Amortized Cost 992,461 803,100
Gross Unrealized Gains 22,182 35,014
Gross Unrealized Losses (9,592) (271)
Fair Value 1,005,051 837,843
Held to maturity    
Amortized Cost 151,474 157,421
Gross Unrealized Gains 9,109 11,035
Gross Unrealized Losses 0 0
Fair Value 160,583 168,456
Federal agency collateralized mortgage obligations    
Available for sale    
Amortized Cost 116,072 144,022
Gross Unrealized Gains 3,019 3,448
Gross Unrealized Losses (3) (17)
Fair Value 119,088 147,453
Held to maturity    
Amortized Cost 1,959 2,661
Gross Unrealized Gains 22 36
Gross Unrealized Losses (2) 0
Fair Value 1,979 2,697
Federal agency mortgage-backed pools    
Available for sale    
Amortized Cost 84,609 114,484
Gross Unrealized Gains 2,866 4,315
Gross Unrealized Losses (124) 0
Fair Value 87,351 118,799
Held to maturity    
Amortized Cost 8,217 8,594
Gross Unrealized Gains 171 243
Gross Unrealized Losses (1) 0
Fair Value 8,387 8,837
Corporate notes    
Available for sale    
Amortized Cost 10,015 9,007
Gross Unrealized Gains 1,072 1,208
Gross Unrealized Losses (4) 0
Fair Value $ 11,083 $ 10,215