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Fair Value of Financial Instruments - Assets measured at fair value on a recurring basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value Disclosures    
Total securities available for sale: $ 805,511 $ 389,424
Recurring basis | Level 1    
Fair Value Disclosures    
Total securities available for sale: 0 0
Recurring basis | Level 2    
Fair Value Disclosures    
Total securities available for sale: 787,429 380,963
Recurring basis | Level 3    
Fair Value Disclosures    
Total securities available for sale: 0 0
Recurring basis | Agency | Level 1    
Fair Value Disclosures    
Total securities available for sale: 0  
Recurring basis | Agency | Level 2    
Fair Value Disclosures    
Total securities available for sale: 47,209  
Recurring basis | Agency | Level 3    
Fair Value Disclosures    
Total securities available for sale: 0  
Recurring basis | Corporate | Level 1    
Fair Value Disclosures    
Total securities available for sale: 0 0
Recurring basis | Corporate | Level 2    
Fair Value Disclosures    
Total securities available for sale: 79,546 37,642
Recurring basis | Corporate | Level 3    
Fair Value Disclosures    
Total securities available for sale: 0 0
Recurring basis | Municipal bonds | Level 1    
Fair Value Disclosures    
Total securities available for sale: 0 0
Recurring basis | Municipal bonds | Level 2    
Fair Value Disclosures    
Total securities available for sale: 232,128 118,803
Recurring basis | Municipal bonds | Level 3    
Fair Value Disclosures    
Total securities available for sale: 0 0
Recurring basis | Collateralized mortgage obligation: residential | Level 1    
Fair Value Disclosures    
Total securities available for sale: 0 0
Recurring basis | Collateralized mortgage obligation: residential | Level 2    
Fair Value Disclosures    
Total securities available for sale: 33,781 31,388
Recurring basis | Collateralized mortgage obligation: residential | Level 3    
Fair Value Disclosures    
Total securities available for sale: 0 0
Recurring basis | Mortgage-backed securities: residential | Level 1    
Fair Value Disclosures    
Total securities available for sale: 0 0
Recurring basis | Mortgage-backed securities: residential | Level 2    
Fair Value Disclosures    
Total securities available for sale: 394,765 193,130
Recurring basis | Mortgage-backed securities: residential | Level 3    
Fair Value Disclosures    
Total securities available for sale: 0 0
Recurring basis | Estimated Fair Value    
Fair Value Disclosures    
Total securities available for sale: 787,429 380,963
Recurring basis | Estimated Fair Value | Agency    
Fair Value Disclosures    
Total securities available for sale: 47,209  
Recurring basis | Estimated Fair Value | Corporate    
Fair Value Disclosures    
Total securities available for sale: 79,546 37,642
Recurring basis | Estimated Fair Value | Municipal bonds    
Fair Value Disclosures    
Total securities available for sale: 232,128 118,803
Recurring basis | Estimated Fair Value | Collateralized mortgage obligation: residential    
Fair Value Disclosures    
Total securities available for sale: 33,781 31,388
Recurring basis | Estimated Fair Value | Mortgage-backed securities: residential    
Fair Value Disclosures    
Total securities available for sale: $ 394,765 $ 193,130