Allowance for Loan Losses (Tables)

12 Months Ended

Dec. 31, 2019

Receivables [Abstract]

Schedule of Allowance for Loan Losses by Portfolio Segment

The following tables present a summary of changes in the allowance for loan losses by portfolio segment:

Year Ended December 31, 2019	Real Estate			Consumer			Commercial			Agriculture			Other		Total
Allowance for loan losses:
Beginning balance	$	31.0		$	8.7		$	31.3		$	2.0		$	—	$	73.0
Provision charged (credited) to operating    expense	(1.3		)	10.6			4.5			0.1			—		13.9
Less loans charged-off	(3.5		)	(13.0		)	(6.6		)	(0.5		)	—		(23.6		)
Add back recoveries of loans previously charged-off	2.7			3.6			3.4			—			—		9.7
Ending balance	$	28.9		$	9.9		$	32.6		$	1.6		$	—	$	73.0
Individually evaluated for impairment	$	1.7		$	—		$	1.7		$	0.2		$	—	$	3.6
Collectively evaluated for impairment	27.2			9.9			30.9			1.4			—		69.4
Ending balance	$	28.9		$	9.9		$	32.6		$	1.6		$	—	$	73.0
Total loans:
Individually evaluated for impairment	$	41.1		$	—		$	17.3		$	6.3		$	—	$	64.7
Collectively evaluated for impairment	6,194.0			1,045.2			1,354.0			272.8			—		8,866.0
Total loans held for investment	$	6,235.1		$	1,045.2		$	1,371.3		$	279.1		$	—	$	8,930.7

Year Ended December 31, 2018	Real Estate			Consumer			Commercial			Agriculture		Other		Total
Allowance for loan losses:
Beginning balance	$	31.7		$	8.7		$	30.5		$	1.2	$	—	$	72.1
Provision charged (credited) to operating    expense	(0.7		)	6.8			1.9			0.6		—		8.6
Less loans charged-off	(3.7		)	(11.3		)	(4.7		)	—		—		(19.7		)
Add back recoveries of loans previously charged-off	3.7			4.5			3.6			0.2		—		12.0
Ending balance	$	31.0		$	8.7		$	31.3		$	2.0	$	—	$	73.0
Individually evaluated for impairment	$	1.3		$	—		$	5.2		$	0.3	$	—	$	6.8
Collectively evaluated for impairment	29.7			8.7			26.1			1.7		—		66.2
Ending balance	$	31.0		$	8.7		$	31.3		$	2.0	$	—	$	73.0
Total loans:
Individually evaluated for impairment	$	41.8		$	—		$	19.9		$	3.1	$	—	$	64.8
Collectively evaluated for impairment	5,791.7			1,070.2			1,290.4			251.7		1.6		8,405.6
Total loans held for investment	$	5,833.5		$	1,070.2		$	1,310.3		$	254.8	$	1.6	$	8,470.4

Year Ended December 31, 2017	Real Estate			Consumer			Commercial			Agriculture			Other		Total
Allowance for loan losses:
Beginning balance	$	28.6		$	7.7		$	38.1		$	1.8		$	—	$	76.2
Provision charged (credited) to operating    expense	6.0			8.1			(2.9		)	(0.2		)	—		11.0
Less loans charged-off	(4.3		)	(11.3		)	(6.8		)	(0.4		)	—		(22.8		)
Add back recoveries of loans previously charged-off	1.4			4.2			2.1			—			—		7.7
Ending balance	$	31.7		$	8.7		$	30.5		$	1.2		$	—	$	72.1
Individually evaluated for impairment	$	6.2		$	—		$	4.4		$	0.2		$	—	$	10.8
Collectively evaluated for impairment	25.5			8.7			26.1			1.0			—		61.3
Ending balance	$	31.7		$	8.7		$	30.5		$	1.2		$	—	$	72.1
Total loans:
Individually evaluated for impairment	$	58.3		$	—		$	23.8		$	1.1		$	—	$	83.2
Collectively evaluated for impairment	5,118.5			1,034.4			1,191.6			135.1			4.9		7,484.5
Total loans held for investment	$	5,176.8		$	1,034.4		$	1,215.4		$	136.2		$	4.9	$	7,567.7