Investment Securities (Investment Securities, Continuous Unrealized Loss Position, Fair Value) (Detail) $ in Thousands	Jun. 30, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Continuous unrealized losses existing for less than 12 months, Fair value	$ 37,286
Continuous unrealized losses existing for less than 12 months, Unrealized losses	(331)
Continuous unrealized losses existing for greater than 12 months, Fair value	51,741
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	(1,840)
Total, Fair value	89,027
Total, Unrealized losses	(2,171)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	146,980
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	(819)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,313
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	(41)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	150,293
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses	(860)
U.S. Treasury
Schedule of Available-for-sale Securities [Line Items]
Continuous unrealized losses existing for less than 12 months, Fair value	2,250
Continuous unrealized losses existing for less than 12 months, Unrealized losses	(1)
Continuous unrealized losses existing for greater than 12 months, Fair value	0
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	0
Total, Fair value	2,250
Total, Unrealized losses	(1)
U.S. Government agencies
Schedule of Available-for-sale Securities [Line Items]
Continuous unrealized losses existing for less than 12 months, Fair value	0
Continuous unrealized losses existing for less than 12 months, Unrealized losses	0
Continuous unrealized losses existing for greater than 12 months, Fair value	0
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	0
Total, Fair value	0
Total, Unrealized losses	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	134,808
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	(647)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	134,808
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses	(647)
Municipal
Schedule of Available-for-sale Securities [Line Items]
Continuous unrealized losses existing for less than 12 months, Fair value	10,789
Continuous unrealized losses existing for less than 12 months, Unrealized losses	(16)
Continuous unrealized losses existing for greater than 12 months, Fair value	7,701
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	(111)
Total, Fair value	18,490
Total, Unrealized losses	(127)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	12,172
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	(172)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	3,313
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	(41)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	15,485
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses	(213)
Corporate notes, Financial issuers
Schedule of Available-for-sale Securities [Line Items]
Continuous unrealized losses existing for less than 12 months, Fair value	19,822
Continuous unrealized losses existing for less than 12 months, Unrealized losses	(178)
Continuous unrealized losses existing for greater than 12 months, Fair value	24,727
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	(1,233)
Total, Fair value	44,549
Total, Unrealized losses	(1,411)
Corporate notes, Other
Schedule of Available-for-sale Securities [Line Items]
Continuous unrealized losses existing for less than 12 months, Fair value	0
Continuous unrealized losses existing for less than 12 months, Unrealized losses	0
Continuous unrealized losses existing for greater than 12 months, Fair value	0
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	0
Total, Fair value	0
Total, Unrealized losses	0
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Continuous unrealized losses existing for less than 12 months, Fair value	0
Continuous unrealized losses existing for less than 12 months, Unrealized losses	0
Continuous unrealized losses existing for greater than 12 months, Fair value	4,089
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	(150)
Total, Fair value	4,089
Total, Unrealized losses	(150)
Mortgage-backed, Collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Continuous unrealized losses existing for less than 12 months, Fair value	2,528
Continuous unrealized losses existing for less than 12 months, Unrealized losses	(15)
Continuous unrealized losses existing for greater than 12 months, Fair value	6,433
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	(76)
Total, Fair value	8,961
Total, Unrealized losses	(91)
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Continuous unrealized losses existing for less than 12 months, Fair value	1,897
Continuous unrealized losses existing for less than 12 months, Unrealized losses	(121)
Continuous unrealized losses existing for greater than 12 months, Fair value	8,791
Continuous unrealized losses existing for greater than 12 months, Unrealized losses	(270)
Total, Fair value	10,688
Total, Unrealized losses	$ (391)