Mergers and Acquisitions (Tables)

12 Months Ended

Dec. 31, 2014

Business Combinations [Abstract]

Consideration transferred, identifiable net assets acquired and resulting bargain purchase gain or goodwill

The following table discloses the calculation of the fair value of the consideration transferred, the total identifiable net assets acquired and the resulting bargain purchase gain or goodwill arising from the FNBR, NCBI and Wheatland acquisitions:

	FNBR			NCBI	Wheatland
(Dollars in thousands)	August 31, 2014			July 31, 2013	May 31, 2013
Fair value of consideration transferred
Fair value of Company shares issued, net of equity issuance costs	$	15,127		16,743	28,290
Cash consideration for outstanding shares	16,690			13,833	11,025
Contingent consideration	—			—	—
Total fair value of consideration transferred	31,817			30,576	39,315
Recognized amounts of identifiable assets acquired and liabilities assumed
Identifiable assets acquired
Cash and cash equivalents	14,578			27,865	23,148
Investment securities	157,018			48,058	75,643
Loans receivable	137,488			215,986	171,199
Core deposit intangible	4,199			3,660	2,079
Accrued income and other assets	35,884			24,262	15,063
Total identifiable assets acquired	349,167			319,831	287,132
Liabilities assumed
Deposits	309,641			294,980	255,197
Federal Home Loan Bank advances	—			—	5,467
Accrued expenses and other liabilities	7,029			4,472	562
Total liabilities assumed	316,670			299,452	261,226
Total identifiable net assets	32,497			20,379	25,906
(Bargain purchase gain) goodwill recognized	$	(680	)	10,197	13,409

Unaudited Pro Forma Summary of the Company as if the Acquisitions had Occurred at the Beginning of the Period

The following unaudited pro forma summary presents consolidated information of the Company as if the FNBR acquisition had occurred on January 1, 2013:

	Years ended
(Dollars in thousands)	December 31, 2014		December 31, 2013
Net interest income and non-interest income	$	371,772	340,393
Net income	113,364		99,275

The following unaudited pro forma summary presents consolidated information of the Company as if the NCBI and Wheatland acquisitions had occurred on January 1, 2012:

	Years ended
(Dollars in thousands)	December 31, 2013		December 31, 2012
Net interest income and non-interest income	$	339,236	334,317
Net income	96,392		80,403