Acquisitions - Schedule of Assets Acquired and Liabilities Assumed (Details) - Community 1st Bancorp $ in Thousands	Nov. 10, 2017 USD ($)
Assets Acquired:
Goodwill	$ 26,000
C1B Book Value
Assets Acquired:
Cash and cash equivalents	91,018
Securities AFS	114,796
Loans, net of deferred fees	230,203
Allowance for loan losses	(3,097)
Premises and equipment, net	1,636
Deferred taxes	1,288
REO	248
FHLB stock and other stock holdings	2,116
Other assets	8,556
Total assets acquired	446,764
Liabilities Assumed:
Deposits	411,463
Borrowings	7,857
Accounts payable and other liabilities	4,931
Total liabilities assumed	424,251
Excess of assets acquired over liabilities assumed	22,513
Total	446,764
Fair Value Adjustments
Assets Acquired:
Securities AFS	(583)
Loans, net of deferred fees	(2,979)
Allowance for loan losses	3,097
Premises and equipment, net	(1,636)
Deferred taxes	(738)
REO	(248)
Goodwill	26,000
Core deposit intangible	5,793
FHLB stock and other stock holdings	(140)
Other assets	(641)
Total assets acquired	27,925
Liabilities Assumed:
Deposits	98
Borrowings	143
Accounts payable and other liabilities	(1,674)
Total liabilities assumed	(1,433)
Excess of assets acquired over liabilities assumed	29,358
Total	27,925
Fair Value
Assets Acquired:
Cash and cash equivalents	91,018
Securities AFS	114,213
Loans, net of deferred fees	227,224
Deferred taxes	550
Goodwill	26,000
Core deposit intangible	5,793
FHLB stock and other stock holdings	1,976
Other assets	7,915
Total assets acquired	474,689
Liabilities Assumed:
Deposits	411,561
Borrowings	8,000
Accounts payable and other liabilities	3,257
Total liabilities assumed	422,818
Excess of assets acquired over liabilities assumed	51,871
Total	474,689
Consideration:
Stock issued	$ 51,871