Acquisition (Details) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018 USD ($) shares	Jun. 30, 2018 USD ($)	May 31, 2018 $ / shares	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares	3,253,060
Assets	$ 1,631,442	$ 1,631,442		$ 1,295,638
Interest-bearing demand deposits	1,778	1,778		4,227
Liabilities	1,419,076	1,419,076		1,145,367
Deposits	1,380,884	1,380,884		1,085,821
Goodwill	59,160	59,160		$ 30,183	$ 30,183	$ 30,183
Business Acquisition, Share Price | $ / shares			$ 0.1955
Columbus First Bancorp, Inc. [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Less common stock issued	63,598	63,598
Less cash paid for the common stock	783	783
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	13,679	13,679
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets	$ 10,350	$ 10,350
Number of branches	1	1
Equity interest exchange ratio	2	2
Business combination, consideration transferred	$ 64,381
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Federal Home Loan Bank Stock	1,207	$ 1,207
Business Combination, Acquired Sales-type Lease Receivable	282,748	282,748
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Loan Receivables Held For Sale	1,819	1,819
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	102	102
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	2,089	2,089
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Real Estate Owned	35	35
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	2,022	2,022
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	314,051	314,051
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities	245,036	245,036
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	22,920	22,920
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Short-term Borrowings	10,000	10,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent	200	200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	491	491
Liabilities assumed	278,647	278,647
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	35,404	35,404
Goodwill	$ 28,977	$ 28,977