Accumulated Other Comprehensive Income (Loss) (Tables)

9 Months Ended

Sep. 30, 2015

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Summary of activity in accumulated other comprehensive income (loss)

($ in Thousands)	Investments Securities Available For Sale			Defined Benefit Pension and Postretirement Obligations			Accumulated Other Comprehensive Income (Loss)
Balance January 1, 2015	$	18,512		$	(23,362	)	$	(4,850	)
Other comprehensive income before reclassifications	35,101			—			35,101
Amounts reclassified from accumulated other comprehensive income (loss)	(4,038		)	1,729			(2,309		)
Income tax expense	(11,907		)	(659		)	(12,566		)
Net other comprehensive income during period	19,156			1,070			20,226
Balance September 30, 2015	$	37,668		$	(22,292	)	$	15,376
Balance January 1, 2014	$	(11,396	)	$	(12,848	)	$	(24,244	)
Other comprehensive income before reclassifications	36,061			—			36,061
Amounts reclassified from accumulated other comprehensive income (loss)	(469		)	994			525
Income tax expense	(13,684		)	(383		)	(14,067		)
Net other comprehensive income during period	21,908			611			22,519
Balance September 30, 2014	$	10,512		$	(12,237	)	$	(1,725	)
($ in Thousands)	Investments Securities Available For Sale			Defined Benefit Pension and Postretirement Obligations			Accumulated Other Comprehensive Income (Loss)
Balance July 1, 2015	$	25,282		$	(22,688	)	$	2,594
Other comprehensive income before reclassifications	22,907			—			22,907
Amounts reclassified from accumulated other comprehensive income (loss)	(2,796		)	639			(2,157		)
Income tax expense	(7,725		)	(243		)	(7,968		)
Net other comprehensive income during period	12,386			396			12,782
Balance September 30, 2015	$	37,668		$	(22,292	)	$	15,376
Balance July 1, 2014	$	22,935		$	(12,441	)	$	10,494
Other comprehensive loss before reclassifications	(20,123		)	—			(20,123		)
Amounts reclassified from accumulated other comprehensive income (loss)	(57		)	332			275
Income tax (expense) benefit	7,757			(128		)	7,629
Net other comprehensive income (loss) during period	(12,423		)	204			(12,219		)
Balance September 30, 2014	$	10,512		$	(12,237	)	$	(1,725	)