Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of year	$ 12,224	$ 11,320	$ 9,345
Charge-offs	(1,009)	(1,576)	(767)
Recoveries on loans previously charged off	721	653	459
Provision for loan losses	1,231	1,827	2,283
Balance at end of year	13,167	12,224	11,320
Allowance for loan losses:
Individually evaluated for impairment				$ 94	$ 208
Collectively evaluated for impairment				13,073	12,016
Total	12,224	11,320	9,345	13,167	12,224
Loans receivable:
Individually evaluated for impairment				1,476	3,818
Collectively evaluated for impairment				1,337,206	1,186,181
Total				1,338,682	1,189,999
Real Estate
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of year	8,507	7,497	4,974
Charge-offs	(381)	(168)	0
Recoveries on loans previously charged off	213	1	1
Provision for loan losses	765	1,177	2,522
Balance at end of year	9,104	8,507	7,497
Allowance for loan losses:
Individually evaluated for impairment				1	0
Collectively evaluated for impairment				9,103	8,507
Total	8,507	7,497	4,974	9,104	8,507
Loans receivable:
Individually evaluated for impairment				1,156	3,204
Collectively evaluated for impairment				1,090,331	982,244
Total				1,091,487	985,448
Commercial and Industrial
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of year	3,548	3,657	4,152
Charge-offs	(272)	(1,320)	(729)
Recoveries on loans previously charged off	356	580	406
Provision for loan losses	245	631	(172)
Balance at end of year	3,877	3,548	3,657
Allowance for loan losses:
Individually evaluated for impairment				93	208
Collectively evaluated for impairment				3,784	3,340
Total	3,548	3,657	4,152	3,877	3,548
Loans receivable:
Individually evaluated for impairment				320	614
Collectively evaluated for impairment				220,954	169,915
Total				221,274	170,529
Consumer
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of year	169	166	219
Charge-offs	(356)	(88)	(38)
Recoveries on loans previously charged off	152	72	52
Provision for loan losses	221	19	(67)
Balance at end of year	186	169	166
Allowance for loan losses:
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				186	169
Total	$ 169	$ 166	$ 219	186	169
Loans receivable:
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				25,921	34,022
Total				$ 25,921	$ 34,022

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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The balance of financing receivables that were collectively evaluated for impairment.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount of expense related to estimated loss from loan and lease transactions.

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