Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Assets Measured at Fair Value on a Recurring Basis

	Recurring Fair Value Measurements at Reporting Date
	March 31, 2019						December 31, 2018
(Dollars in thousands)	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Assets:
Available-for-sale investment securities:
Obligations of:
States and political subdivisions	$	—	$	84,827	$	—	$	—	$	88,587	$	—
Residential mortgage-backed securities	—		706,976		—		—		692,608		—
Commercial mortgage-backed securities	—		6,649		—		—		6,707		—
Bank-issued trust preferred securities	—		4,118		—		—		3,989		—
Total available-for-sale securities	—		802,570		—		—		791,891		—
Equity investment securities	109		190		—		94		183		—
Derivative assets (a)	—		5,521		—		—		4,544		—
Liabilities:
Derivative liabilities (b)	$	—	$	6,404	$	—	$	—	$	3,562	$	—

(a) Included in Other assets on the Consolidated Balance Sheets. For additional information, see Note 9 Derivative Financial Instruments of the Notes to the Unaudited Consolidated Financial Statements.

(b) Included in Other liabilities on the Consolidated Balance Sheets. For additional information, see Note 9 Derivative Financial Instruments of the Notes to the Unaudited Consolidated Financial Statements.

Fair Value Measurements, Nonrecurring [Table Text Block]

The following table provides the fair value for each class of assets and liabilities required to be measured and reported at fair value on a non-recurring basis on the Unaudited Consolidated Balance Sheets by level in the fair value hierarchy.

	Non-Recurring Fair Value Measurements at Reporting Date
	March 31, 2019						December 31, 2018
(Dollars in thousands)	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Impaired loans	$	—	$	—	$	27,200	$	—	$	—	$	24,129
Other real estate owned ("OREO")	—		—		81		—		—		94

Fair Values of Financial Assets and Liabilities on Balance Sheets

	Fair Value Measurements of Other Financial Instruments
(Dollars in thousands)	Fair Value Hierarchy Level	March 31, 2019				December 31, 2018
		Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Cash and cash equivalents	1	$	82,072	$	82,072	$	77,612	$	77,612
Held-to-maturity investment securities:
Obligations of:
States and political subdivisions	2	4,401		4,965		4,403		4,896
Residential mortgage-backed securities	2	28,348		28,276		29,044		28,603
Commercial mortgage-backed securities	2	2,857		2,825		3,514		3,464
Total held-to-maturity securities		35,606		36,066		36,961		36,963
Other investment securities:
Federal Home Loan Bank ("FHLB") stock	2	27,586		27,586		29,367		29,367
Federal Reserve Bank ("FRB") stock	2	12,294		12,294		12,294		12,294
Nonqualified deferred compensation	2	1,210		1,210		987		987
United Bankers' Bancorporation Inc. ("UBB") stock	2	60		60		60		60
Other investment securities (a)		41,150		41,150		42,708		42,708
Net loans	3	2,716,641		2,884,562		2,708,583		2,907,537
Loans held for sale	2	2,191		2,069		5,470		5,492
Bank owned life insurance	3	69,419		69,419		68,934		68,934
Servicing rights (b)	3	2,507		3,973		2,655		4,568
Liabilities:
Deposits	2	$	3,137,413	$	3,149,980	$	2,955,465	$	2,953,452
Short-term borrowings	2	191,363		191,259		356,198		349,994
Long-term borrowings	2	105,995		104,285		109,644		107,696